Re: 2.6.21-rc3-mm1 RSDL results
Con Kolivas wrote: On Wednesday 14 March 2007 05:21, Mark Lord wrote: Con Kolivas wrote: Can you try the new version of RSDL. Assuming it doesn't oops on you it has some accounting bugfixes which may have been biting you. Retesting today with 2.6.21-rc3-git7 + 2.6.21-rc3-sched-rsdl-0.30.patch. Still not pleasant to use the GUI with a kernel build (-j1 or -j2) happening unless the build is manually "nice'd". Also, accounting looks weird in top(1). With a 100% busy machine, top will show something like this : top - 14:20:11 up 10:22, 1 user, load average: 2.65, 2.80, 2.18 Tasks: 134 total, 4 running, 128 sleeping, 0 stopped, 2 zombie Cpu(s): 68.7% us, 6.7% sy, 24.7% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si Mem: 2076964k total, 2002560k used,74404k free, 148924k buffers Swap: 2409740k total, 244k used, 2409496k free, 1448876k cached PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND 1824 root 36 10 11748 7244 1936 R 4.0 0.3 0:00.12 cc1 1845 root 31 0 8080 5272 1412 R 1.7 0.3 0:00.05 cc1 4139 root 20 0 176m 35m 6860 S 1.3 1.7 18:59.35 Xorg 29381 root 20 0 33712 16m 12m R 1.0 0.8 0:27.24 konsole 3 root 20 0 000 S 0.3 0.0 0:00.49 events/0 1529 root 20 0 2556 1460 752 S 0.3 0.1 0:00.05 make 14623 root 20 0 2200 1144 860 R 0.3 0.1 0:00.89 top 1 root 20 0 1568 532 464 S 0.0 0.0 0:00.22 init 2 root 39 19 000 S 0.0 0.0 0:00.01 ksoftirqd/0 4 root 20 0 000 S 0.0 0.0 0:00.00 khelper 5 root 20 0 000 S 0.0 0.0 0:00.00 kthread Mmm.. I wonder where all of that 100% CPU went to.. the busiest tasks are only showing up as 4.0% and 1.7% (when in fact they are using near 100%). Nothing ever looks like it stays running for very long. That would be enough to account for this sort of top picture. Sorry, I just don't buy that one. This was a 2-second sampling interval in top. top(1) is a program that has to work, so if this scheduler breaks it like this, then we need to understand and fix top(1) or the scheduler. What HZ are you running? Do you usually run two makes at different nice levels? This was HZ=1000, with NO_HZ. And, no, not normally different nice levels. Here I was just trying to keep the machine usable while building a couple of things. Keep at it. Someday this might be good enough for mainline, but right now the stock scheduler beats it for my desktop (notebook) loads. Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Wednesday 14 March 2007 05:21, Mark Lord wrote: > Con Kolivas wrote: > > Can you try the new version of RSDL. Assuming it doesn't oops on you it > > has some accounting bugfixes which may have been biting you. > > Retesting today with 2.6.21-rc3-git7 + 2.6.21-rc3-sched-rsdl-0.30.patch. > > Still not pleasant to use the GUI with a kernel build (-j1 or -j2) > happening unless the build is manually "nice'd". > > Also, accounting looks weird in top(1). > > With a 100% busy machine, top will show something like this : > > top - 14:20:11 up 10:22, 1 user, load average: 2.65, 2.80, 2.18 > > Tasks: 134 total, 4 running, 128 sleeping, 0 stopped, 2 zombie > > Cpu(s): 68.7% us, 6.7% sy, 24.7% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% > > si Mem: 2076964k total, 2002560k used,74404k free, 148924k > > buffers Swap: 2409740k total, 244k used, 2409496k free, 1448876k > > cached > > > > PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND > > 1824 root 36 10 11748 7244 1936 R 4.0 0.3 0:00.12 cc1 > > 1845 root 31 0 8080 5272 1412 R 1.7 0.3 0:00.05 cc1 > > 4139 root 20 0 176m 35m 6860 S 1.3 1.7 18:59.35 Xorg > > 29381 root 20 0 33712 16m 12m R 1.0 0.8 0:27.24 konsole > > 3 root 20 0 000 S 0.3 0.0 0:00.49 events/0 > > 1529 root 20 0 2556 1460 752 S 0.3 0.1 0:00.05 make > > 14623 root 20 0 2200 1144 860 R 0.3 0.1 0:00.89 top > > 1 root 20 0 1568 532 464 S 0.0 0.0 0:00.22 init > > 2 root 39 19 000 S 0.0 0.0 0:00.01 ksoftirqd/0 > > 4 root 20 0 000 S 0.0 0.0 0:00.00 khelper > > 5 root 20 0 000 S 0.0 0.0 0:00.00 kthread > > Mmm.. I wonder where all of that 100% CPU went to.. the busiest tasks > are only showing up as 4.0% and 1.7% (when in fact they are using near > 100%). Nothing ever looks like it stays running for very long. That would be enough to account for this sort of top picture. What HZ are you running? Do you usually run two makes at different nice levels? Thanks. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
Con Kolivas wrote: Can you try the new version of RSDL. Assuming it doesn't oops on you it has some accounting bugfixes which may have been biting you. Retesting today with 2.6.21-rc3-git7 + 2.6.21-rc3-sched-rsdl-0.30.patch. Still not pleasant to use the GUI with a kernel build (-j1 or -j2) happening unless the build is manually "nice'd". Also, accounting looks weird in top(1). With a 100% busy machine, top will show something like this : top - 14:20:11 up 10:22, 1 user, load average: 2.65, 2.80, 2.18 Tasks: 134 total, 4 running, 128 sleeping, 0 stopped, 2 zombie Cpu(s): 68.7% us, 6.7% sy, 24.7% ni, 0.0% id, 0.0% wa, 0.0% hi, 0.0% si Mem: 2076964k total, 2002560k used,74404k free, 148924k buffers Swap: 2409740k total, 244k used, 2409496k free, 1448876k cached PID USER PR NI VIRT RES SHR S %CPU %MEMTIME+ COMMAND 1824 root 36 10 11748 7244 1936 R 4.0 0.3 0:00.12 cc1 1845 root 31 0 8080 5272 1412 R 1.7 0.3 0:00.05 cc1 4139 root 20 0 176m 35m 6860 S 1.3 1.7 18:59.35 Xorg 29381 root 20 0 33712 16m 12m R 1.0 0.8 0:27.24 konsole 3 root 20 0 000 S 0.3 0.0 0:00.49 events/0 1529 root 20 0 2556 1460 752 S 0.3 0.1 0:00.05 make 14623 root 20 0 2200 1144 860 R 0.3 0.1 0:00.89 top 1 root 20 0 1568 532 464 S 0.0 0.0 0:00.22 init 2 root 39 19 000 S 0.0 0.0 0:00.01 ksoftirqd/0 4 root 20 0 000 S 0.0 0.0 0:00.00 khelper 5 root 20 0 000 S 0.0 0.0 0:00.00 kthread Mmm.. I wonder where all of that 100% CPU went to.. the busiest tasks are only showing up as 4.0% and 1.7% (when in fact they are using near 100%). Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sunday 11 March 2007 23:38, James Cloos wrote: > |> See: > |> http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r200/r200_i > |>octl.c?revision=1.37&view=markup > > OK. > > Mesa is in git, now, but that still applies. The gitweb url is: > > http://gitweb.freedesktop.org/?p=mesa/mesa.git > > and for the version of the above file in the master branch: > > http://gitweb.freedesktop.org/?p=mesa/mesa.git;a=blob;f=src/mesa/drivers/dr >i/r200/r200_ioctl.c > > The recursive grep(1) on mesa shows: > > ,[grep -r sched_yield mesa] > > | mesa/mesa/src/mesa/drivers/dri/r300/radeon_ioctl.c: sched_yield(); > | mesa/mesa/src/mesa/drivers/dri/i915tex/intel_batchpool.c: > | sched_yield(); > | mesa/mesa/src/mesa/drivers/dri/i915tex/intel_batchbuffer.c: > | sched_yield(); mesa/mesa/src/mesa/drivers/dri/common/vblank.h:#include > |/* for sched_yield() */ > | mesa/mesa/src/mesa/drivers/dri/common/vblank.h:#include/* > | for sched_yield() */ mesa/mesa/src/mesa/drivers/dri/common/vblank.h: > | sched_yield(); \ > | mesa/mesa/src/mesa/drivers/dri/unichrome/via_ioctl.c: sched_yield(); > | mesa/mesa/src/mesa/drivers/dri/i915/intel_ioctl.c: sched_yield(); > | mesa/mesa/src/mesa/drivers/dri/r200/r200_ioctl.c: sched_yield(); > > ` > > Thanks for the heads up. I must've grep(1)ed the xorg subdir rather > than the parent dir, and so missed mesa. I just wonder what the heck all these will do to testing when using any of these drivers. Whether or not we do no yield, mild yield or full blown expiration yield, somehow or other I can't get over the feeling that if the code relies on yield() we can't really trust them to be meaningful cpu scheduler tests. This means most 3d apps out there that aren't using binary drivers, whether they be (fscking) glxgears, audio app visualisations or what... -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
|> See: |> http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r200/r200_ioctl.c?revision=1.37&view=markup OK. Mesa is in git, now, but that still applies. The gitweb url is: http://gitweb.freedesktop.org/?p=mesa/mesa.git and for the version of the above file in the master branch: http://gitweb.freedesktop.org/?p=mesa/mesa.git;a=blob;f=src/mesa/drivers/dri/r200/r200_ioctl.c The recursive grep(1) on mesa shows: ,[grep -r sched_yield mesa] | mesa/mesa/src/mesa/drivers/dri/r300/radeon_ioctl.c: sched_yield(); | mesa/mesa/src/mesa/drivers/dri/i915tex/intel_batchpool.c: sched_yield(); | mesa/mesa/src/mesa/drivers/dri/i915tex/intel_batchbuffer.c: sched_yield(); | mesa/mesa/src/mesa/drivers/dri/common/vblank.h:#include/* for sched_yield() */ | mesa/mesa/src/mesa/drivers/dri/common/vblank.h:#include/* for sched_yield() */ | mesa/mesa/src/mesa/drivers/dri/common/vblank.h: sched_yield(); \ | mesa/mesa/src/mesa/drivers/dri/unichrome/via_ioctl.c: sched_yield(); | mesa/mesa/src/mesa/drivers/dri/i915/intel_ioctl.c: sched_yield(); | mesa/mesa/src/mesa/drivers/dri/r200/r200_ioctl.c: sched_yield(); ` Thanks for the heads up. I must've grep(1)ed the xorg subdir rather than the parent dir, and so missed mesa. -JimC -- James Cloos <[EMAIL PROTECTED]> OpenPGP: 1024D/ED7DAEA6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sunday 11 March 2007 10:34, Con Kolivas wrote: > On Sunday 11 March 2007 05:21, Mark Lord wrote: > > Con Kolivas wrote: > > > On Saturday 10 March 2007 05:07, Mark Lord wrote: > > >> Mmm.. when it's good, it's *really* good. > > >> My desktop feels snappier and all of that. > > > > > >.. > > > > > >> But when it's bad, it stinks. > > >> Like when a "make -j2" kernel rebuild is happening in a background > > >> window > > > > > > And that's bad. When you say "it stinks" is it more than 3 times > > > slower? It should be precisely 3 times slower under that load (although > > > low cpu using things like audio wont be affected by running 3 times > > > slower). If it feels like much more than that much slower, there is a > > > bug there somewhere. > > > > Scrolling windows is incredibly jerkey, and very very sluggish > > when images are involved (eg. a large web page in firefox). > > > > > As another reader suggested, how does it run with the compile 'niced'? > > > How does it perform with make (without a -j number). > > > > Yes, it behaves itself when the "make -j2" is nice'd. > > > > >> This is on a Pentium-M 760 single-core, w/2GB SDRAM (notebook). > > > > > > What HZ are you running? Are you running a Beryl desktop? > > > > HZ==1000, NO_HZ, Kubunutu Dapper Drake distro, ATI X300 open-source X.org > > driver. > > Can you try the new version of RSDL. Assuming it doesn't oops on you it has > some accounting bugfixes which may have been biting you. Oh I just checked the mesa repo for that driver as well. It seems the r300 drivers have sched_yield in them as well, but not all components. You may be getting bitten by this too. http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r300/radeon_ioctl.c?revision=1.14&view=markup I don't really know what the radeon and other models are so I'm not sure if it applies to your hardware; I just did a random search through the r300 directory. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sunday 11 March 2007 05:21, Mark Lord wrote: > Con Kolivas wrote: > > On Saturday 10 March 2007 05:07, Mark Lord wrote: > >> Mmm.. when it's good, it's *really* good. > >> My desktop feels snappier and all of that. > > > >.. > > > >> But when it's bad, it stinks. > >> Like when a "make -j2" kernel rebuild is happening in a background > >> window > > > > And that's bad. When you say "it stinks" is it more than 3 times slower? > > It should be precisely 3 times slower under that load (although low cpu > > using things like audio wont be affected by running 3 times slower). If > > it feels like much more than that much slower, there is a bug there > > somewhere. > > Scrolling windows is incredibly jerkey, and very very sluggish > when images are involved (eg. a large web page in firefox). > > > As another reader suggested, how does it run with the compile 'niced'? > > How does it perform with make (without a -j number). > > Yes, it behaves itself when the "make -j2" is nice'd. > > >> This is on a Pentium-M 760 single-core, w/2GB SDRAM (notebook). > > > > What HZ are you running? Are you running a Beryl desktop? > > HZ==1000, NO_HZ, Kubunutu Dapper Drake distro, ATI X300 open-source X.org > driver. Can you try the new version of RSDL. Assuming it doesn't oops on you it has some accounting bugfixes which may have been biting you. Thanks -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sunday 11 March 2007 04:01, James Cloos wrote: > > "Con" == Con Kolivas <[EMAIL PROTECTED]> writes: > > Con> It's sad that sched_yield is still in our graphics card drivers ... > > I just did a recursive grep(1) on my mirror of the freedesktop git > repos for sched_yield. This only checked the master branches as I > did not bother to script up something to clone each, check out all > branches in turn, and grep(1) each possibility. > > The output is just: > :; grep -r sched_yield FDO/xorg > > FDO/xorg/xserver/hw/kdrive/via/viadraw.c: sched_yield(); > FDO/xorg/driver/xf86-video-glint/src/pm2_video.c:if (sync) /* > sched_yield? */ > > Is there something else I should grep(1) for? If not, it looks as > if sched_yield(2) has been evicted from the drivers. See: http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r200/r200_ioctl.c?revision=1.37&view=markup -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
Con Kolivas wrote: On Saturday 10 March 2007 05:07, Mark Lord wrote: Mmm.. when it's good, it's *really* good. My desktop feels snappier and all of that. .. But when it's bad, it stinks. Like when a "make -j2" kernel rebuild is happening in a background window And that's bad. When you say "it stinks" is it more than 3 times slower? It should be precisely 3 times slower under that load (although low cpu using things like audio wont be affected by running 3 times slower). If it feels like much more than that much slower, there is a bug there somewhere. Scrolling windows is incredibly jerkey, and very very sluggish when images are involved (eg. a large web page in firefox). As another reader suggested, how does it run with the compile 'niced'? How does it perform with make (without a -j number). Yes, it behaves itself when the "make -j2" is nice'd. This is on a Pentium-M 760 single-core, w/2GB SDRAM (notebook). What HZ are you running? Are you running a Beryl desktop? HZ==1000, NO_HZ, Kubunutu Dapper Drake distro, ATI X300 open-source X.org driver. Cheers - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
> "Con" == Con Kolivas <[EMAIL PROTECTED]> writes: Con> It's sad that sched_yield is still in our graphics card drivers ... I just did a recursive grep(1) on my mirror of the freedesktop git repos for sched_yield. This only checked the master branches as I did not bother to script up something to clone each, check out all branches in turn, and grep(1) each possibility. The output is just: :; grep -r sched_yield FDO/xorg FDO/xorg/xserver/hw/kdrive/via/viadraw.c: sched_yield(); FDO/xorg/driver/xf86-video-glint/src/pm2_video.c:if (sync) /* sched_yield? */ Is there something else I should grep(1) for? If not, it looks as if sched_yield(2) has been evicted from the drivers. -JimC -- James Cloos <[EMAIL PROTECTED]> OpenPGP: 1024D/ED7DAEA6 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 13:26, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 01:20:22PM +1100, Con Kolivas wrote: > > Progress at last! And without any patches! Well those look very > > reasonable to me. Especially since -j5 is a worst case scenario. > > Well that's with a noyield patch and your sched_tick fix. > > > But would you say it's still _adequate_ with ccache considering you > > only have 1/6th cpu left for X? With and without ccache it's quite a > > different workload so they will behave differently. > > No, I don't think 1/6th is being left for X in the ccache case so I > think there's a bug lurking here. My memload, execload, and forkload > test cases did better even with X niced. > > To confirm, I've just run 15 instances of memload with unniced Xorg > and it performs better than make -j 5 with ccache. > > If I have some time tomorrow, I'll try to do a straight -mm1 to mm2 > comparison with different loads. Great, thanks very much for all that. I've found a few subtle bugs in the process and some that haven't made it to the list either. I'll respin a set of patches against -mm2 with the changes shortly. Thanks! -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 01:20:22PM +1100, Con Kolivas wrote: > Progress at last! And without any patches! Well those look very reasonable to > me. Especially since -j5 is a worst case scenario. Well that's with a noyield patch and your sched_tick fix. > But would you say it's still _adequate_ with ccache considering you > only have 1/6th cpu left for X? With and without ccache it's quite a > different workload so they will behave differently. No, I don't think 1/6th is being left for X in the ccache case so I think there's a bug lurking here. My memload, execload, and forkload test cases did better even with X niced. To confirm, I've just run 15 instances of memload with unniced Xorg and it performs better than make -j 5 with ccache. If I have some time tomorrow, I'll try to do a straight -mm1 to mm2 comparison with different loads. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 12:42, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 12:28:38PM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 11:49, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote: > > > > Ok, so some of the basics then. Can you please give me the output of > > > > 'top -b' running for a few seconds during the whole affair? > > > > > > Here you go: > > > > > > http://selenic.com/baseline > > > http://selenic.com/underload > > > > > > This is with 2.6.20+rsdl+tickfix at HZ=250. > > > > > > Something I haven't mentioned about my setup is that I'm using ccache. > > > And it turns out disabling ccache makes a large difference. Going to > > > switch back to a NO_HZ kernel and see what that looks like. > > > > Your X is reniced to -10 so try again with X nice 0 please. > > Doh, can't believe I didn't notice that. That's apparently a default > in Debian/unstable (not sure where to tweak it). See other email from Kyle on how to dpkg reconfigure. I submitted a bug report to debian years ago about this and I presume it was fixed but you've probably slowly dist upgraded from an older version and it stayed in your config? > Reniced: > > without ccachewith ccache > make -j 5 > beryl good ok > galeon ok/good ok > mp3 good good > terminalgood ok > mouse good ok Progress at last! And without any patches! Well those look very reasonable to me. Especially since -j5 is a worst case scenario. > We're still left with a big unexplained ccache differential, But would you say it's still _adequate_ with ccache considering you only have 1/6th cpu left for X? With and without ccache it's quite a different workload so they will behave differently. > and a big > NO_HZ vs HZ=250 differential. That part I don't know about. You've only tested the difference with X running nice -10. I need to look further at the mechanism for -nice tasks. It should be possible to run smoothly even with a -niced X (although that was never my intent) so perhaps that's not working properly. I'll look into that. Thanks! -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Mar 09, 2007, at 20:42:30, Matt Mackall wrote: Doh, can't believe I didn't notice that. That's apparently a default in Debian/unstable (not sure where to tweak it). Run this: [EMAIL PROTECTED]:~# dpkg-reconfigure xserver-xorg It should ask you if you want to run the X-server at a lower (higher?) nice level. To decrease the minimum-debconf-priority for new package installations you can run this: [EMAIL PROTECTED]:~# dpkg-reconfigure debconf Change the "Ignore questions with a priority less than: " value to "medium" or "low". Cheers, Kyle Moffett - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 12:28:38PM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 11:49, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote: > > > Ok, so some of the basics then. Can you please give me the output of 'top > > > -b' running for a few seconds during the whole affair? > > > > Here you go: > > > > http://selenic.com/baseline > > http://selenic.com/underload > > > > This is with 2.6.20+rsdl+tickfix at HZ=250. > > > > Something I haven't mentioned about my setup is that I'm using ccache. > > And it turns out disabling ccache makes a large difference. Going to > > switch back to a NO_HZ kernel and see what that looks like. > > Your X is reniced to -10 so try again with X nice 0 please. Doh, can't believe I didn't notice that. That's apparently a default in Debian/unstable (not sure where to tweak it). Reniced: without ccachewith ccache make -j 5 beryl good ok galeon ok/good ok mp3 good good terminalgood ok mouse good ok We're still left with a big unexplained ccache differential, and a big NO_HZ vs HZ=250 differential. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 11:49, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote: > > Ok, so some of the basics then. Can you please give me the output of 'top > > -b' running for a few seconds during the whole affair? > > Here you go: > > http://selenic.com/baseline > http://selenic.com/underload > > This is with 2.6.20+rsdl+tickfix at HZ=250. > > Something I haven't mentioned about my setup is that I'm using ccache. > And it turns out disabling ccache makes a large difference. Going to > switch back to a NO_HZ kernel and see what that looks like. Your X is reniced to -10 so try again with X nice 0 please. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 12:02:25PM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 09:12, Con Kolivas wrote: > > On Saturday 10 March 2007 08:57, Willy Tarreau wrote: > > > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > 5x memload: good > > > > 5x execload: good > > > > 5x forkload: good > > > > 5 parallel makes: mostly good > > > > make -j 5: bad > > > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > > > that he added bugs when porting to -mm, or that someting in -mm causes > > > the trouble. Your experience with -mm seems so much different from mine > > > with mainline, there must be a difference somewhere ! > > > > Good idea. > > It's all very odd Matt. It really isn't behaving anything like you describe > for myself or others. It sounds more like a real bug than what the design > would do at all. The only things that are different on yours is Beryl and a > different graphics card. When you're comparing to mainline are you > comparing -mm1 to -mm2 to ensure something else from -mm isn't responsible? > Also have you tried rsdl on 2.6.20 as Willy suggested? Haven't tried -mm2. So far I've tried 2.6.21-rc2-mm2 (aka 'stock'), 2.6.21-rc3-mm1, and 2.6.20+rsdl. I also did a test with Metacity and saw the same issues under load. So I think Beryl is not part of the problem. Right now it's looking like the problem is caused by ccache. Disabling ccache with 2.6.21-rc2-mm1+tickfix+noyield lets me run make -j 5 acceptably. So my new column would be: RSDL+NO_HZ+tickfix+noyield+noccache make -j 5 beryl ok/good galeon ok/good mp3good terminal good mouse good So it's about on par with 2.6.20, maybe slightly better. I suspect ccache lock contention is somehow involved though it doesn't explain why my 5 independent makes test beats out make -j 5. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 09:12, Con Kolivas wrote: > On Saturday 10 March 2007 08:57, Willy Tarreau wrote: > > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > 5x memload: good > > > 5x execload: good > > > 5x forkload: good > > > 5 parallel makes: mostly good > > > make -j 5: bad > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > job server uses pipe I/O to control how many jobs are running. > > > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > > that he added bugs when porting to -mm, or that someting in -mm causes > > the trouble. Your experience with -mm seems so much different from mine > > with mainline, there must be a difference somewhere ! > > Good idea. It's all very odd Matt. It really isn't behaving anything like you describe for myself or others. It sounds more like a real bug than what the design would do at all. The only things that are different on yours is Beryl and a different graphics card. When you're comparing to mainline are you comparing -mm1 to -mm2 to ensure something else from -mm isn't responsible? Also have you tried rsdl on 2.6.20 as Willy suggested? I would really love to get to the bottom of this as it really shouldn't behave that way under load no matter how the load is dished out. Thanks! -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 11:34:26AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 09:29, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > > > > newly-started processes. > > > > > > > > > > > > > > Ah that's some nice detective work there. Mainline does some > > > > > > > rather complex accounting on sched_fork including (possibly) a > > > > > > > whole timer tick which rsdl does not do. make forks off > > > > > > > continuously so what you say may well be correct. I'll see if I > > > > > > > can try to revert to the mainline behaviour in sched_fork (which > > > > > > > was obviously there for a reason). > > > > > > > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix > > > > > > the qemu misbehaviour and bitmap errors so far too! Now can you > > > > > > please try this to see if it fixes your problem? > > > > > > > > > > Sorry, it's about the same. I now suspect an accounting glitch > > > > > involving pipe wake-ups. > > > > > > > > > > 5x memload: good > > > > > 5x execload: good > > > > > 5x forkload: good > > > > > 5 parallel makes: mostly good > > > > > make -j 5: bad > > > > > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > > testing for those from mainline as I suspected it would be ok. Guess > > > > I"m wrong. > > > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > > Something else is going wrong... wtf though? > > > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > > make load so far. > > Ok, so some of the basics then. Can you please give me the output of 'top -b' > running for a few seconds during the whole affair? Here you go: http://selenic.com/baseline http://selenic.com/underload This is with 2.6.20+rsdl+tickfix at HZ=250. Something I haven't mentioned about my setup is that I'm using ccache. And it turns out disabling ccache makes a large difference. Going to switch back to a NO_HZ kernel and see what that looks like. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 09:29, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > > > newly-started processes. > > > > > > > > > > > > Ah that's some nice detective work there. Mainline does some > > > > > > rather complex accounting on sched_fork including (possibly) a > > > > > > whole timer tick which rsdl does not do. make forks off > > > > > > continuously so what you say may well be correct. I'll see if I > > > > > > can try to revert to the mainline behaviour in sched_fork (which > > > > > > was obviously there for a reason). > > > > > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix > > > > > the qemu misbehaviour and bitmap errors so far too! Now can you > > > > > please try this to see if it fixes your problem? > > > > > > > > Sorry, it's about the same. I now suspect an accounting glitch > > > > involving pipe wake-ups. > > > > > > > > 5x memload: good > > > > 5x execload: good > > > > 5x forkload: good > > > > 5 parallel makes: mostly good > > > > make -j 5: bad > > > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > testing for those from mainline as I suspected it would be ok. Guess > > > I"m wrong. > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > Something else is going wrong... wtf though? > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > make load so far. Ok, so some of the basics then. Can you please give me the output of 'top -b' running for a few seconds during the whole affair? Thanks very much for your testing so far! -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 10:06, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 10:02:37AM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 09:29, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > > > So what's different between makes in parallel and make -j 5? > > > > > > Make's job server uses pipe I/O to control how many jobs are > > > > > > running. > > > > > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > > > testing for those from mainline as I suspected it would be ok. > > > > > Guess I"m wrong. > > > > > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > > > Something else is going wrong... wtf though? > > > > > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > > > make load so far. > > > > Ok, back to the pipe idea. Without needing a kernel recompile, can you > > try running the make -j5 as a SCHED_BATCH task? > > Seems the same. > > Oddly, nice make -j 5 is better than batch (but not quite up to stock). Shouldn't be odd. SCHED_BATCH (as Ingo implemented it which is what I'm trying to reproduce for RSDL) is meant to give the same cpu as the same nice level, but not give low latency. Nice on the other hand will give much less cpu. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 10:02:37AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 09:29, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > > So what's different between makes in parallel and make -j 5? Make's > > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > > testing for those from mainline as I suspected it would be ok. Guess > > > > I"m wrong. > > > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > > Something else is going wrong... wtf though? > > > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > > make load so far. > > Ok, back to the pipe idea. Without needing a kernel recompile, can you try > running the make -j5 as a SCHED_BATCH task? Seems the same. Oddly, nice make -j 5 is better than batch (but not quite up to stock). -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 09:29, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > > So what's different between makes in parallel and make -j 5? Make's > > > > job server uses pipe I/O to control how many jobs are running. > > > > > > Hmm it must be those deep pipes again then. I removed any quirks > > > testing for those from mainline as I suspected it would be ok. Guess > > > I"m wrong. > > > > I shouldn't blame this straight up though if NO_HZ makes it better. > > Something else is going wrong... wtf though? > > Just so we're clear, dynticks has only 'fixed' the single non-parallel > make load so far. Ok, back to the pipe idea. Without needing a kernel recompile, can you try running the make -j5 as a SCHED_BATCH task? This wrapper will make it possible: http://freequaos.host.sk/schedtool/schedtool-1.2.9.tar.bz2 then schedtool -B -e make -j5 If that helps it gives me something to work with. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 09:18:05AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 08:57, Con Kolivas wrote: > > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > > newly-started processes. > > > > > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > > > complex accounting on sched_fork including (possibly) a whole timer > > > > > tick which rsdl does not do. make forks off continuously so what you > > > > > say may well be correct. I'll see if I can try to revert to the > > > > > mainline behaviour in sched_fork (which was obviously there for a > > > > > reason). > > > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the > > > > qemu misbehaviour and bitmap errors so far too! Now can you please try > > > > this to see if it fixes your problem? > > > > > > Sorry, it's about the same. I now suspect an accounting glitch involving > > > pipe wake-ups. > > > > > > 5x memload: good > > > 5x execload: good > > > 5x forkload: good > > > 5 parallel makes: mostly good > > > make -j 5: bad > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > job server uses pipe I/O to control how many jobs are running. > > > > Hmm it must be those deep pipes again then. I removed any quirks testing > > for those from mainline as I suspected it would be ok. Guess I"m wrong. > > I shouldn't blame this straight up though if NO_HZ makes it better. Something > else is going wrong... wtf though? Just so we're clear, dynticks has only 'fixed' the single non-parallel make load so far. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 09:12:07AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 08:57, Willy Tarreau wrote: > > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > > newly-started processes. > > > > > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > > > complex accounting on sched_fork including (possibly) a whole timer > > > > > tick which rsdl does not do. make forks off continuously so what you > > > > > say may well be correct. I'll see if I can try to revert to the > > > > > mainline behaviour in sched_fork (which was obviously there for a > > > > > reason). > > > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the > > > > qemu misbehaviour and bitmap errors so far too! Now can you please try > > > > this to see if it fixes your problem? > > > > > > Sorry, it's about the same. I now suspect an accounting glitch involving > > > pipe wake-ups. > > > > > > 5x memload: good > > > 5x execload: good > > > 5x forkload: good > > > 5 parallel makes: mostly good > > > make -j 5: bad > > > > > > So what's different between makes in parallel and make -j 5? Make's > > > job server uses pipe I/O to control how many jobs are running. > > > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > > that he added bugs when porting to -mm, or that someting in -mm causes > > the trouble. Your experience with -mm seems so much different from mine > > with mainline, there must be a difference somewhere ! > > Good idea. 2.6.20+RSDL+tickfix+noyield behaves more or less the same under make -j5 as 2.6.21-rc3-mm1. A bit worse, perhaps. There's no tickless on 2.6.20, so that could explain that. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 09:12:07AM +1100, Con Kolivas wrote: (...) > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > > that he added bugs when porting to -mm, or that someting in -mm causes > > the trouble. Your experience with -mm seems so much different from mine > > with mainline, there must be a difference somewhere ! > > Good idea. OK, so let me summarize : plain 2.6.20 + http://www.kernel.org/pub/linux/kernel/v2.6/patch-2.6.20.2.bz2 + http://ck.kolivas.org/patches/staircase-deadline/sched-rsdl-0.26.patch + http://marc.theaimsgroup.com/?l=linux-kernel&m=117347544926731&q=raw should be a good starting point. > > Con, is your patch necessary for mainline patch too ? I see that it > > should apply, but sometimes -mm may justify changes. > > Yes it will be necessary for the mainline patch too. OK Thanks Con. Best regards, Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 08:57, Con Kolivas wrote: > On Saturday 10 March 2007 08:39, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > newly-started processes. > > > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > > complex accounting on sched_fork including (possibly) a whole timer > > > > tick which rsdl does not do. make forks off continuously so what you > > > > say may well be correct. I'll see if I can try to revert to the > > > > mainline behaviour in sched_fork (which was obviously there for a > > > > reason). > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the > > > qemu misbehaviour and bitmap errors so far too! Now can you please try > > > this to see if it fixes your problem? > > > > Sorry, it's about the same. I now suspect an accounting glitch involving > > pipe wake-ups. > > > > 5x memload: good > > 5x execload: good > > 5x forkload: good > > 5 parallel makes: mostly good > > make -j 5: bad > > > > So what's different between makes in parallel and make -j 5? Make's > > job server uses pipe I/O to control how many jobs are running. > > Hmm it must be those deep pipes again then. I removed any quirks testing > for those from mainline as I suspected it would be ok. Guess I"m wrong. I shouldn't blame this straight up though if NO_HZ makes it better. Something else is going wrong... wtf though? -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 08:57, Willy Tarreau wrote: > On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > > My suspicion is the problem lies in giving too much quanta to > > > > > newly-started processes. > > > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > > complex accounting on sched_fork including (possibly) a whole timer > > > > tick which rsdl does not do. make forks off continuously so what you > > > > say may well be correct. I'll see if I can try to revert to the > > > > mainline behaviour in sched_fork (which was obviously there for a > > > > reason). > > > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the > > > qemu misbehaviour and bitmap errors so far too! Now can you please try > > > this to see if it fixes your problem? > > > > Sorry, it's about the same. I now suspect an accounting glitch involving > > pipe wake-ups. > > > > 5x memload: good > > 5x execload: good > > 5x forkload: good > > 5 parallel makes: mostly good > > make -j 5: bad > > > > So what's different between makes in parallel and make -j 5? Make's > > job server uses pipe I/O to control how many jobs are running. > > Matt, could you check with plain 2.6.20 + Con's patch ? It is possible > that he added bugs when porting to -mm, or that someting in -mm causes > the trouble. Your experience with -mm seems so much different from mine > with mainline, there must be a difference somewhere ! Good idea. > Con, is your patch necessary for mainline patch too ? I see that it > should apply, but sometimes -mm may justify changes. Yes it will be necessary for the mainline patch too. > Best regards, > Willy -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 03:39:59PM -0600, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > My suspicion is the problem lies in giving too much quanta to > > > > newly-started processes. > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > complex > > > accounting on sched_fork including (possibly) a whole timer tick which > > > rsdl > > > does not do. make forks off continuously so what you say may well be > > > correct. I'll see if I can try to revert to the mainline behaviour in > > > sched_fork (which was obviously there for a reason). > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the qemu > > misbehaviour and bitmap errors so far too! Now can you please try this to > > see > > if it fixes your problem? > > Sorry, it's about the same. I now suspect an accounting glitch involving > pipe wake-ups. > > 5x memload: good > 5x execload: good > 5x forkload: good > 5 parallel makes: mostly good > make -j 5: bad > > So what's different between makes in parallel and make -j 5? Make's > job server uses pipe I/O to control how many jobs are running. Matt, could you check with plain 2.6.20 + Con's patch ? It is possible that he added bugs when porting to -mm, or that someting in -mm causes the trouble. Your experience with -mm seems so much different from mine with mainline, there must be a difference somewhere ! Con, is your patch necessary for mainline patch too ? I see that it should apply, but sometimes -mm may justify changes. Best regards, Willy - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 08:39, Matt Mackall wrote: > On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > > My suspicion is the problem lies in giving too much quanta to > > > > newly-started processes. > > > > > > Ah that's some nice detective work there. Mainline does some rather > > > complex accounting on sched_fork including (possibly) a whole timer > > > tick which rsdl does not do. make forks off continuously so what you > > > say may well be correct. I'll see if I can try to revert to the > > > mainline behaviour in sched_fork (which was obviously there for a > > > reason). > > > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the qemu > > misbehaviour and bitmap errors so far too! Now can you please try this > > to see if it fixes your problem? > > Sorry, it's about the same. I now suspect an accounting glitch involving > pipe wake-ups. > > 5x memload: good > 5x execload: good > 5x forkload: good > 5 parallel makes: mostly good > make -j 5: bad > > So what's different between makes in parallel and make -j 5? Make's > job server uses pipe I/O to control how many jobs are running. Hmm it must be those deep pipes again then. I removed any quirks testing for those from mainline as I suspected it would be ok. Guess I"m wrong. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 08:19:18AM +1100, Con Kolivas wrote: > On Saturday 10 March 2007 08:07, Con Kolivas wrote: > > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > > My suspicion is the problem lies in giving too much quanta to > > > newly-started processes. > > > > Ah that's some nice detective work there. Mainline does some rather complex > > accounting on sched_fork including (possibly) a whole timer tick which rsdl > > does not do. make forks off continuously so what you say may well be > > correct. I'll see if I can try to revert to the mainline behaviour in > > sched_fork (which was obviously there for a reason). > > Wow! Thanks Matt. You've found a real bug too. This seems to fix the qemu > misbehaviour and bitmap errors so far too! Now can you please try this to see > if it fixes your problem? Sorry, it's about the same. I now suspect an accounting glitch involving pipe wake-ups. 5x memload: good 5x execload: good 5x forkload: good 5 parallel makes: mostly good make -j 5: bad So what's different between makes in parallel and make -j 5? Make's job server uses pipe I/O to control how many jobs are running. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 02:46:24PM -0600, Matt Mackall wrote: > A priori, this load should be manageable by RSDL as the interactive > loads are all pretty small. So I wrote a little Python script that > basically continuously memcpys some 16MB chunks of memory: > > #!/usr/bin/python > a = "a" * 16 * 1024 * 1024 > while 1: > b = a[1:] + "b" > a = b[1:] + "c" > > I've got 1.5G of RAM, so I can run quite a few of these without > killing my pagecache. This should test whether a) Beryl's actually > running up against memory bandwidth issues and b) whether "simple" > static loads work. As you can see, running 5 instances of this script > leaves me in good shape still. 10 is still in "ok" territory, with top > showing each getting 9.7-10% of the CPU. 15 starts to feel sluggish. > 20 the mouse jumps a bit and I got an MP3 skip. 30 is getting pretty > bad, but still not as bad as the make -j 5 load. > > My suspicion is the problem lies in giving too much quanta to > newly-started processes. I've also tried 10+ instances of each of the following: forkload: #!/bin/sh ./forkload& execload: #!/bin/sh exec ./execload And it's quite well-behaved in both cases. Also, if I run: for a in 1 2 3 4 5; do mkdir $a; cp .config $a; make O=$a & done ..I get mostly good behavior with some occassional snags. Things run much better than make -j 5. Unfortunately, that doesn't make my kernel get built faster. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 08:07, Con Kolivas wrote: > On Saturday 10 March 2007 07:46, Matt Mackall wrote: > > My suspicion is the problem lies in giving too much quanta to > > newly-started processes. > > Ah that's some nice detective work there. Mainline does some rather complex > accounting on sched_fork including (possibly) a whole timer tick which rsdl > does not do. make forks off continuously so what you say may well be > correct. I'll see if I can try to revert to the mainline behaviour in > sched_fork (which was obviously there for a reason). Wow! Thanks Matt. You've found a real bug too. This seems to fix the qemu misbehaviour and bitmap errors so far too! Now can you please try this to see if it fixes your problem? --- kernel/sched.c |8 +++- 1 file changed, 3 insertions(+), 5 deletions(-) Index: linux-2.6.21-rc3-mm1/kernel/sched.c === --- linux-2.6.21-rc3-mm1.orig/kernel/sched.c2007-03-10 08:08:11.0 +1100 +++ linux-2.6.21-rc3-mm1/kernel/sched.c 2007-03-10 08:13:57.0 +1100 @@ -1560,7 +1560,7 @@ int fastcall wake_up_state(struct task_s return try_to_wake_up(p, state, 0); } -static void task_expired_entitlement(struct rq *rq, struct task_struct *p); +static void task_running_tick(struct rq *rq, struct task_struct *p); /* * Perform scheduler related setup for a newly forked process p. * p is forked by current. @@ -1621,10 +1621,8 @@ void fastcall sched_fork(struct task_str * left from its timeslice. Taking the runqueue lock is not * a problem. */ - struct rq *rq = __task_rq_lock(current); - - task_expired_entitlement(rq, current); - __task_rq_unlock(rq); + current->time_slice = 1; + task_running_tick(cpu_rq(cpu), current); } local_irq_enable(); out: -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 07:46, Matt Mackall wrote: > Ok, I've now disabled sched_yield (I'm using xorg radeon drivers). Great. > So far: > > rc2-mm2 RSDL RSDL+NO_HZ RSDL+NO_HZ+no_yield estimated CPU > no load > berylgood good great great~30% at 600MHz > galeon good good goodgood 100% at 600MHz > mp3 good good goodgood < 5% at 600MHz > terminal good good goodgood ~0 > mousegood good goodgood ~0 > make > beryl awful ok good > galeon bad ok good > mp3good goodgood > terminal bad goodgood > mouse bad goodgood It's sad that sched_yield is still in our graphics card drivers ... > make -j2 > beryl awful bad/ok > metacity bad/ok <- it's not beryl-specifc > galeon bad bad/ok > mp3good good > terminal bad bad/ok > mouse bad bad/ok > make -j5 > berylokawful awful awful/bad > galeon okbad bad bad > mp3 good good gooda couple skips > terminal okbad bad bad > mousegood bad bad bad > memload x5 > berylok/good > galeon ok/good > mp3 good > terminal ok/good > mouseok/good > > > good = no problems > ok = noticeable latency > bad = hard to use > awful = completely unusable > > By the way, make -j5 is my usual kernel compile because it gives me > the best wall time on this box. > > A priori, this load should be manageable by RSDL as the interactive > loads are all pretty small. So I wrote a little Python script that > basically continuously memcpys some 16MB chunks of memory: > > #!/usr/bin/python > a = "a" * 16 * 1024 * 1024 > while 1: > b = a[1:] + "b" > a = b[1:] + "c" > > I've got 1.5G of RAM, so I can run quite a few of these without > killing my pagecache. This should test whether a) Beryl's actually > running up against memory bandwidth issues and b) whether "simple" > static loads work. As you can see, running 5 instances of this script > leaves me in good shape still. 10 is still in "ok" territory, with top > showing each getting 9.7-10% of the CPU. 15 starts to feel sluggish. > 20 the mouse jumps a bit and I got an MP3 skip. 30 is getting pretty > bad, but still not as bad as the make -j 5 load. > > My suspicion is the problem lies in giving too much quanta to > newly-started processes. Ah that's some nice detective work there. Mainline does some rather complex accounting on sched_fork including (possibly) a whole timer tick which rsdl does not do. make forks off continuously so what you say may well be correct. I'll see if I can try to revert to the mainline behaviour in sched_fork (which was obviously there for a reason). -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 07:15:38AM +1100, Con Kolivas wrote: > How odd. I would have thought that if an interaction was to occur it would > have been without the new feature. Clearly what you describe without NO_HZ is > not the expected behaviour with RSDL. I wonder what went wrong. Are you on > 100HZ on that laptop? While I expect 100HZ should be ok, it might just not > be... My laptop is about the same performance and works fine with 100HZ under > load of all sorts BUT I don't have Beryl (which I would have thought swayed > things in the opposite direction also). Note I also did a test with metacity and got more or less the same results. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Sat, Mar 10, 2007 at 07:26:15AM +1100, Con Kolivas wrote: > > How odd. I would have thought that if an interaction was to occur it would > > have been without the new feature. Clearly what you describe without NO_HZ > > is not the expected behaviour with RSDL. I wonder what went wrong. Are you > > on 100HZ on that laptop? While I expect 100HZ should be ok, it might just > > not be... My laptop is about the same performance and works fine with 100HZ > > under load of all sorts BUT I don't have Beryl (which I would have thought > > swayed things in the opposite direction also). HZ=250 > Oh and can you grep dmesg for: > Scheduler bitmap error Nope, sorry. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 07:39:05PM +1100, Con Kolivas wrote: > On Friday 09 March 2007 19:20, Matt Mackall wrote: > > And I've just rebooted with NO_HZ and things are greatly improved. At > > idle, Beryl effects are silky smooth (possibly better than stock) and > > shows less load. Under 'make', Beryl is still responsive as is Galeon. > > No sign of lagging mouse or typing. > > > > Under make -j 5, things are intermittent. Galeon scrolling is > > sometimes still responsive, but Beryl, terminals and mouse still drag > > quite a bit. > > I just replied before you sent this one out I think our messages passed each > other across the ocean somewhere. I don't quite get what combination of > factors you're saying here caused great improvement. Was it enabling NO_HZ on > mainline cpu scheduler or disabling NO_HZ or on RSDL? Ok, I've now disabled sched_yield (I'm using xorg radeon drivers). So far: rc2-mm2 RSDL RSDL+NO_HZ RSDL+NO_HZ+no_yield estimated CPU no load berylgood good great great~30% at 600MHz galeon good good goodgood 100% at 600MHz mp3 good good goodgood < 5% at 600MHz terminal good good goodgood ~0 mousegood good goodgood ~0 make beryl awful ok good galeon bad ok good mp3good goodgood terminal bad goodgood mouse bad goodgood make -j2 beryl awful bad/ok metacity bad/ok <- it's not beryl-specifc galeon bad bad/ok mp3good good terminal bad bad/ok mouse bad bad/ok make -j5 berylokawful awful awful/bad galeon okbad bad bad mp3 good good gooda couple skips terminal okbad bad bad mousegood bad bad bad memload x5 berylok/good galeon ok/good mp3 good terminal ok/good mouseok/good good = no problems ok = noticeable latency bad = hard to use awful = completely unusable By the way, make -j5 is my usual kernel compile because it gives me the best wall time on this box. A priori, this load should be manageable by RSDL as the interactive loads are all pretty small. So I wrote a little Python script that basically continuously memcpys some 16MB chunks of memory: #!/usr/bin/python a = "a" * 16 * 1024 * 1024 while 1: b = a[1:] + "b" a = b[1:] + "c" I've got 1.5G of RAM, so I can run quite a few of these without killing my pagecache. This should test whether a) Beryl's actually running up against memory bandwidth issues and b) whether "simple" static loads work. As you can see, running 5 instances of this script leaves me in good shape still. 10 is still in "ok" territory, with top showing each getting 9.7-10% of the CPU. 15 starts to feel sluggish. 20 the mouse jumps a bit and I got an MP3 skip. 30 is getting pretty bad, but still not as bad as the make -j 5 load. My suspicion is the problem lies in giving too much quanta to newly-started processes. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 07:15, Con Kolivas wrote: > On Saturday 10 March 2007 05:27, Matt Mackall wrote: > > On Fri, Mar 09, 2007 at 07:39:05PM +1100, Con Kolivas wrote: > > > On Friday 09 March 2007 19:20, Matt Mackall wrote: > > > > And I've just rebooted with NO_HZ and things are greatly improved. At > > > > idle, Beryl effects are silky smooth (possibly better than stock) and > > > > shows less load. Under 'make', Beryl is still responsive as is > > > > Galeon. No sign of lagging mouse or typing. > > > > > > > > Under make -j 5, things are intermittent. Galeon scrolling is > > > > sometimes still responsive, but Beryl, terminals and mouse still drag > > > > quite a bit. > > > > > > I just replied before you sent this one out I think our messages passed > > > each other across the ocean somewhere. I don't quite get what > > > combination of factors you're saying here caused great improvement. Was > > > it enabling NO_HZ on mainline cpu scheduler or disabling NO_HZ or on > > > RSDL? > > > > Turning on NO_HZ on RSDL greatly improved it. I have not tried NO_HZ > > on mainline. The first test was with NO_HZ=n, the second was with > > NO_HZ=y. > > How odd. I would have thought that if an interaction was to occur it would > have been without the new feature. Clearly what you describe without NO_HZ > is not the expected behaviour with RSDL. I wonder what went wrong. Are you > on 100HZ on that laptop? While I expect 100HZ should be ok, it might just > not be... My laptop is about the same performance and works fine with 100HZ > under load of all sorts BUT I don't have Beryl (which I would have thought > swayed things in the opposite direction also). Oh and can you grep dmesg for: Scheduler bitmap error If that occurs it's not performing properly. A subtle bug that's busting my chops to try and track down. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 05:07, Mark Lord wrote: > Mmm.. when it's good, it's *really* good. > My desktop feels snappier and all of that. > > No noticeable jerkiness of windows/scrolling, > which I *do* observe with the stock scheduler. Thats good. > But when it's bad, it stinks. > Like when a "make -j2" kernel rebuild is happening in a background window And that's bad. When you say "it stinks" is it more than 3 times slower? It should be precisely 3 times slower under that load (although low cpu using things like audio wont be affected by running 3 times slower). If it feels like much more than that much slower, there is a bug there somewhere. As another reader suggested, how does it run with the compile 'niced'? How does it perform with make (without a -j number). > This is on a Pentium-M 760 single-core, w/2GB SDRAM (notebook). What HZ are you running? Are you running a Beryl desktop? > JADP (Just Another Data Point). Appreciated, thanks. > Mark -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Saturday 10 March 2007 05:27, Matt Mackall wrote: > On Fri, Mar 09, 2007 at 07:39:05PM +1100, Con Kolivas wrote: > > On Friday 09 March 2007 19:20, Matt Mackall wrote: > > > And I've just rebooted with NO_HZ and things are greatly improved. At > > > idle, Beryl effects are silky smooth (possibly better than stock) and > > > shows less load. Under 'make', Beryl is still responsive as is Galeon. > > > No sign of lagging mouse or typing. > > > > > > Under make -j 5, things are intermittent. Galeon scrolling is > > > sometimes still responsive, but Beryl, terminals and mouse still drag > > > quite a bit. > > > > I just replied before you sent this one out I think our messages passed > > each other across the ocean somewhere. I don't quite get what combination > > of factors you're saying here caused great improvement. Was it enabling > > NO_HZ on mainline cpu scheduler or disabling NO_HZ or on RSDL? > > Turning on NO_HZ on RSDL greatly improved it. I have not tried NO_HZ > on mainline. The first test was with NO_HZ=n, the second was with > NO_HZ=y. How odd. I would have thought that if an interaction was to occur it would have been without the new feature. Clearly what you describe without NO_HZ is not the expected behaviour with RSDL. I wonder what went wrong. Are you on 100HZ on that laptop? While I expect 100HZ should be ok, it might just not be... My laptop is about the same performance and works fine with 100HZ under load of all sorts BUT I don't have Beryl (which I would have thought swayed things in the opposite direction also). > As an aside, we should not name config options NO_* or DISABLE_* > because of the potential for double negation. Case in point, I couldn't figure out what you were saying :) -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 07:39:05PM +1100, Con Kolivas wrote: > On Friday 09 March 2007 19:20, Matt Mackall wrote: > > And I've just rebooted with NO_HZ and things are greatly improved. At > > idle, Beryl effects are silky smooth (possibly better than stock) and > > shows less load. Under 'make', Beryl is still responsive as is Galeon. > > No sign of lagging mouse or typing. > > > > Under make -j 5, things are intermittent. Galeon scrolling is > > sometimes still responsive, but Beryl, terminals and mouse still drag > > quite a bit. > > I just replied before you sent this one out I think our messages passed each > other across the ocean somewhere. I don't quite get what combination of > factors you're saying here caused great improvement. Was it enabling NO_HZ on > mainline cpu scheduler or disabling NO_HZ or on RSDL? Turning on NO_HZ on RSDL greatly improved it. I have not tried NO_HZ on mainline. The first test was with NO_HZ=n, the second was with NO_HZ=y. My baseline test was with mainline NO_HZ=y. As an aside, we should not name config options NO_* or DISABLE_* because of the potential for double negation. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
Mark Lord wrote: Mmm.. when it's good, it's *really* good. My desktop feels snappier and all of that. No noticeable jerkiness of windows/scrolling, which I *do* observe with the stock scheduler. But when it's bad, it stinks. Like when a "make -j2" kernel rebuild is happening in a background window Would you please do that same "make -j2" niced. Tell us how that feels. -- Jeffrey Hundstad - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
Mmm.. when it's good, it's *really* good. My desktop feels snappier and all of that. No noticeable jerkiness of windows/scrolling, which I *do* observe with the stock scheduler. But when it's bad, it stinks. Like when a "make -j2" kernel rebuild is happening in a background window This is on a Pentium-M 760 single-core, w/2GB SDRAM (notebook). JADP (Just Another Data Point). Cheers Mark - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
William Lee Irwin III <[EMAIL PROTECTED]> writes:
> On Fri, Mar 09, 2007 at 12:07:06PM +0300, Serge Belyshev wrote:
>> If you see sched_yield() when stracing any 3d program, I suggest you
>> to try this bruteforce workaround, which works fine for me,
>> disable sched_yield():
>
> May I suggest LD_PRELOAD of a library consisting of only a nopped
> sched_yield() function in userspace?
>
Sure. This is definitely clearer way to do. You just need to put
export LD_PRELOAD=/path/to/your/lib.so somewhere early enough.
cat > yield.c << EOF
int sched_yield (void)
{
return 0;
}
EOF
gcc yield.c -o yield.so -shared -O2 -fPIC -g
-
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Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 12:07:06PM +0300, Serge Belyshev wrote: > If you see sched_yield() when stracing any 3d program, I suggest you > to try this bruteforce workaround, which works fine for me, > disable sched_yield(): May I suggest LD_PRELOAD of a library consisting of only a nopped sched_yield() function in userspace? -- wli - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
Con Kolivas <[EMAIL PROTECTED]> writes:
> On Friday 09 March 2007 18:53, Matt Mackall wrote:
...
>>
>> With a single non-parallel make running (all in cache, mind you), the
>> system kicks up into just about 100% CPU usage at full speed. Desktop
>> spinning becomes between 10x to 100x slower (from ~30fps to < 1fps).
>> Galeon scrolling pauses for as much as a second. Mouse movement pauses
>> for as much as a second. Typing in terminals lags noticeably.
>>
>> This is not the expected behavior of a fair, low-latency scheduler.
>
> No indeed it does not sound right at all to me either. Last time I
> encountered
> something like this we traced it and hit sched_yield calls somewhere in the
> graphic pipeline. So first question is, how does mainline perform with the
> same testcase, and second question is umm whatever it is that is slow is
> there a way to trace it to see if it yields?
Matt, some 3d drivers are known to do sched_yield() behind user's back,
(notably dri radeon ones, grep for sched_yield:
http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r200/r200_ioctl.c?revision=1.37&view=markup
http://webcvs.freedesktop.org/mesa/Mesa/src/mesa/drivers/dri/r300/radeon_ioctl.c?revision=1.14&view=markup)
thus absolutely killing any desktop interactivity whatsoever.
If you see sched_yield() when stracing any 3d program, I suggest you
to try this bruteforce workaround, which works fine for me,
disable sched_yield():
kernel/sched.c |9 +++--
1 file changed, 7 insertions(+), 2 deletions(-)
Index: linux/kernel/sched.c
===
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -4285,7 +4285,7 @@ asmlinkage long sys_sched_getaffinity(pi
* This function yields the current CPU by dropping the priority of current
* to the lowest priority.
*/
-asmlinkage long sys_sched_yield(void)
+static long sys_sched_yield1(void)
{
struct rq *rq = this_rq_lock();
struct task_struct *p = current;
@@ -4312,6 +4312,11 @@ asmlinkage long sys_sched_yield(void)
return 0;
}
+asmlinkage long sys_sched_yield(void)
+{
+ return 0;
+}
+
static void __cond_resched(void)
{
#ifdef CONFIG_DEBUG_SPINLOCK_SLEEP
@@ -4395,7 +4400,7 @@ EXPORT_SYMBOL(cond_resched_softirq);
void __sched yield(void)
{
set_current_state(TASK_RUNNING);
- sys_sched_yield();
+ sys_sched_yield1();
}
EXPORT_SYMBOL(yield);
-
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Re: 2.6.21-rc3-mm1 RSDL results
On Friday 09 March 2007 19:20, Matt Mackall wrote: > And I've just rebooted with NO_HZ and things are greatly improved. At > idle, Beryl effects are silky smooth (possibly better than stock) and > shows less load. Under 'make', Beryl is still responsive as is Galeon. > No sign of lagging mouse or typing. > > Under make -j 5, things are intermittent. Galeon scrolling is > sometimes still responsive, but Beryl, terminals and mouse still drag > quite a bit. I just replied before you sent this one out I think our messages passed each other across the ocean somewhere. I don't quite get what combination of factors you're saying here caused great improvement. Was it enabling NO_HZ on mainline cpu scheduler or disabling NO_HZ or on RSDL? -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Friday 09 March 2007 18:53, Matt Mackall wrote: > Well then I suppose something must be broken. When my box is idle, I > can grab my desktop and spin it around and generate less than 25% CPU > with the CPU stepped all the way down from 1.7GHz to 600MHz (Beryl is > actually much snappier than many conventional window managers by doing > just about everything through GL). By comparison, grabbing the Galeon > scroll bar and wiggling it will generate 100% CPU (still throttled > though) but remain relatively smooth. > > With a single non-parallel make running (all in cache, mind you), the > system kicks up into just about 100% CPU usage at full speed. Desktop > spinning becomes between 10x to 100x slower (from ~30fps to < 1fps). > Galeon scrolling pauses for as much as a second. Mouse movement pauses > for as much as a second. Typing in terminals lags noticeably. > > This is not the expected behavior of a fair, low-latency scheduler. No indeed it does not sound right at all to me either. Last time I encountered something like this we traced it and hit sched_yield calls somewhere in the graphic pipeline. So first question is, how does mainline perform with the same testcase, and second question is umm whatever it is that is slow is there a way to trace it to see if it yields? > For reference, this was with HZ=250, PREEMPT, PREEMPT_BKL, and !NO_HZ. Ah I also wonder if it hasn't broken with NO_HZ. I haven't had a chance to even confirm that the code works properly with it, I was only assuming (after our last chat). See if turning that off makes a difference? Thanks for testing! -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 01:53:58AM -0600, Matt Mackall wrote: > On Fri, Mar 09, 2007 at 05:28:03PM +1100, Con Kolivas wrote: > > On Friday 09 March 2007 16:39, Matt Mackall wrote: > > > First off, let me say that I think your approach has great promise, > > > but I'm afraid it doesn't work so well here yet. > > > > > > Box is an R51 Thinkpad, 1.7GHz Pentium M. I'm using a make -j 5 as a > > > test load. > > > > > > With 2.6.21-rc2-mm2, I get slightly sluggish response for opening new > > > terminals, scrolling in Galeon, and a bit jerky behaviour for spinning > > > Beryl's 3D desktop. Playing MP3s off an sshfs FUSE mount works fine. > > > Typing across ssh sessions has no noticeable lag. Mouse pointer > > > movement is smooth. > > > > > > With 2.6.21-rc3-mm1, terminals take longer to open, Galeon is > > > noticeably more sluggish, and Beryl's desktop switching goes from being > > > jerky to a 5-second agony. Typing in shells, remote or not, > > > lags noticeably. Mouse pointer is alternately smooth or jerky. But > > > MP3s still work great! > > > > > > Problems persist with make -j 2 and make. > > > > make -j5 sucks you'll get precisely 1/6th cpu for galeon with this > > scheduler > > which is perfectly fair and I make no apology for it, nor do I plan to > > optimise for it. With make (without jobs) you'll still only get 50% cpu so > > it > > should be precisely half speed unless you nice it. Does it feel precisely > > half speed? It's supposed to. This is one of the drawbacks of a perfectly > > fair approach; its... fair and will need more liberal use of nice. > > Well then I suppose something must be broken. When my box is idle, I > can grab my desktop and spin it around and generate less than 25% CPU > with the CPU stepped all the way down from 1.7GHz to 600MHz (Beryl is > actually much snappier than many conventional window managers by doing > just about everything through GL). By comparison, grabbing the Galeon > scroll bar and wiggling it will generate 100% CPU (still throttled > though) but remain relatively smooth. > > With a single non-parallel make running (all in cache, mind you), the > system kicks up into just about 100% CPU usage at full speed. Desktop > spinning becomes between 10x to 100x slower (from ~30fps to < 1fps). > Galeon scrolling pauses for as much as a second. Mouse movement pauses > for as much as a second. Typing in terminals lags noticeably. > > This is not the expected behavior of a fair, low-latency scheduler. > > For reference, this was with HZ=250, PREEMPT, PREEMPT_BKL, and !NO_HZ. And I've just rebooted with NO_HZ and things are greatly improved. At idle, Beryl effects are silky smooth (possibly better than stock) and shows less load. Under 'make', Beryl is still responsive as is Galeon. No sign of lagging mouse or typing. Under make -j 5, things are intermittent. Galeon scrolling is sometimes still responsive, but Beryl, terminals and mouse still drag quite a bit. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Fri, Mar 09, 2007 at 05:28:03PM +1100, Con Kolivas wrote: > On Friday 09 March 2007 16:39, Matt Mackall wrote: > > First off, let me say that I think your approach has great promise, > > but I'm afraid it doesn't work so well here yet. > > > > Box is an R51 Thinkpad, 1.7GHz Pentium M. I'm using a make -j 5 as a > > test load. > > > > With 2.6.21-rc2-mm2, I get slightly sluggish response for opening new > > terminals, scrolling in Galeon, and a bit jerky behaviour for spinning > > Beryl's 3D desktop. Playing MP3s off an sshfs FUSE mount works fine. > > Typing across ssh sessions has no noticeable lag. Mouse pointer > > movement is smooth. > > > > With 2.6.21-rc3-mm1, terminals take longer to open, Galeon is > > noticeably more sluggish, and Beryl's desktop switching goes from being > > jerky to a 5-second agony. Typing in shells, remote or not, > > lags noticeably. Mouse pointer is alternately smooth or jerky. But > > MP3s still work great! > > > > Problems persist with make -j 2 and make. > > make -j5 sucks you'll get precisely 1/6th cpu for galeon with this scheduler > which is perfectly fair and I make no apology for it, nor do I plan to > optimise for it. With make (without jobs) you'll still only get 50% cpu so it > should be precisely half speed unless you nice it. Does it feel precisely > half speed? It's supposed to. This is one of the drawbacks of a perfectly > fair approach; its... fair and will need more liberal use of nice. Well then I suppose something must be broken. When my box is idle, I can grab my desktop and spin it around and generate less than 25% CPU with the CPU stepped all the way down from 1.7GHz to 600MHz (Beryl is actually much snappier than many conventional window managers by doing just about everything through GL). By comparison, grabbing the Galeon scroll bar and wiggling it will generate 100% CPU (still throttled though) but remain relatively smooth. With a single non-parallel make running (all in cache, mind you), the system kicks up into just about 100% CPU usage at full speed. Desktop spinning becomes between 10x to 100x slower (from ~30fps to < 1fps). Galeon scrolling pauses for as much as a second. Mouse movement pauses for as much as a second. Typing in terminals lags noticeably. This is not the expected behavior of a fair, low-latency scheduler. For reference, this was with HZ=250, PREEMPT, PREEMPT_BKL, and !NO_HZ. -- Mathematics is the supreme nostalgia of our time. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Re: 2.6.21-rc3-mm1 RSDL results
On Friday 09 March 2007 16:39, Matt Mackall wrote: > First off, let me say that I think your approach has great promise, > but I'm afraid it doesn't work so well here yet. > > Box is an R51 Thinkpad, 1.7GHz Pentium M. I'm using a make -j 5 as a > test load. > > With 2.6.21-rc2-mm2, I get slightly sluggish response for opening new > terminals, scrolling in Galeon, and a bit jerky behaviour for spinning > Beryl's 3D desktop. Playing MP3s off an sshfs FUSE mount works fine. > Typing across ssh sessions has no noticeable lag. Mouse pointer > movement is smooth. > > With 2.6.21-rc3-mm1, terminals take longer to open, Galeon is > noticeably more sluggish, and Beryl's desktop switching goes from being > jerky to a 5-second agony. Typing in shells, remote or not, > lags noticeably. Mouse pointer is alternately smooth or jerky. But > MP3s still work great! > > Problems persist with make -j 2 and make. make -j5 sucks you'll get precisely 1/6th cpu for galeon with this scheduler which is perfectly fair and I make no apology for it, nor do I plan to optimise for it. With make (without jobs) you'll still only get 50% cpu so it should be precisely half speed unless you nice it. Does it feel precisely half speed? It's supposed to. This is one of the drawbacks of a perfectly fair approach; its... fair and will need more liberal use of nice. -- -ck - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
