[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Mika Fischer, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report: apport-collect -p linux Also, could you please test the latest upstream kernel available following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Please do not test the daily folder, but the one all the way at the bottom. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags: kernel-fixed-upstream kernel-fixed-upstream-VERSION-NUMBER where VERSION-NUMBER is the version number of the kernel you tested. For example: kernel-fixed-upstream-v3.11 This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag: needs-upstream-testing If the mainline kernel does not fix this bug, please add the following tags: kernel-bug-exists-upstream kernel-bug-exists-upstream-VERSION-NUMBER As well, please remove the tag: needs-upstream-testing Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding. ** Tags removed: q45 ** Tags added: hardy needs-kernel-logs needs-upstream-testing ** Changed in: linux (Ubuntu) Status: Triaged => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/210780/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: linux Status: Confirmed => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/210780/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
@Nigel: Your BIOS has chosen to set up the MTRRs in a way that cannot be fixed by the kernel (or mtrr-uncover) without changing the memory caching ranges. The BIOS uses overlapping ranges. That won't work when the system wants to change uncachable to write-combining for an X driver. The kernel (and mtrr-uncover) try to set up equivalent non-overlapping ranges. mtrr-uncover says that to do this it needs more MTRRs than the architecture has. Newer X drivers don't use MTRRs to do that change. I don't remember what the rules are for the newer "PAT" mechanism. It may be that the problem no longer matters. I tried to explain much of this in the mtrr-uncover documentation. 1) you could ignore this and hope that performance isn't impacted. You could even test this (perhaps by ditching some RAM) 2) you could figure out another MTRR layout that would work. You would have to figure out if the uncachable range could be made simpler (larger) without breaking anything. Then 8 MTRRs should be enough. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I have a laptop intel i3 CPU with Intel HD GPU with 6GB ram running Ubuntu 10.10 64 bit. I get the following error in dmesg: [drm] MTRR allocation failed. Graphics performance may suffer. When I run "mtrr-uncover" , I get the following: Initial MTRR configuration: 0 0x0-0x1 write-back 2 0x0dc00-0x0dfff uncachable 1 0x0e000-0x0 uncachable 6 0x17c00-0x17fff uncachable 5 0x19c00-0x19fff uncachable 4 0x1a000-0x1bfff uncachable 3 0x1c000-0x1 uncachable ./mtrr-uncover: 10 MTRRs needed but only 8 in architecture. Can anyone help me with problem ? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: linux Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: xserver-xorg-video-intel Importance: Unknown => Medium -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: xserver-xorg-video-intel Importance: Medium => Unknown -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/210780 Title: MTRRs set up incorrectly with 4GB RAM -> X slow -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: xserver-xorg-video-intel Status: Invalid => Won't Fix ** Changed in: xserver-xorg-video-intel Importance: Unknown => Medium -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
re mtrr-uncover: I updated it to deal with a change to kernel header that hijacked a symbol that I had used. The link is now ftp://ftp.cs.utoronto.ca/pub/hugh/mtrr-uncover-2009august14.tgz Best advice: look in that directory for the newest version, indicated by the filename. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
It didn't help the reporter of the upstream bug, but it might be a difference between Intel and AMD systems? Having enable_mtrr_cleanup enabled by default would be good, it was suggested on the lkml, but haven't happend so far? http://lkml.org/lkml/2009/2/19/108 -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Newer Kernels (e.g. 2.6.28) support the kernel parameter "enable_mtrr_cleanup" which sets up non-overlaping mttr's (at least on my q45). -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I'm now using Ubuntu 9.04 on my x61t. GLXgears now reports varying amounts in the range 900 to 1150 without any mucking with MTRRs. That suggests that the Intel X video driver now uses the PAT mechanism. Good! The MTRRs are still overlapping. I had to change mtrr-uncover to deal with a gratuitous change made to the format of /proc/mtrr in kernel 2.6.28. You can get the newer version at ftp://ftp.cs.utoronto.ca/pub/hugh/mtrr-uncover-2009may13.tgz Interestingly, fixing the MTRRs with mtrr-uncover and restarting X seemed to make glxgears run consistently at about 900. I have no idea why. Adding "enable_mtrr_cleanup" flag to the appropriate "kernel" line(s) in your /boot/grub/menu.lst will also attempt to eliminate overlapping MTRRs. I don't know which Ubuntu kernel first included the cleanup code but it is in Jaunty's 2.6.28. On my system, the performance effect is the same as if you used mtrr-uncover. Of course it only operates at boot time. There have been obscure cases where mtrr-uncover worked and enable_mtrr_cleanup did not. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
The upstream bug is specific to i386 and is claimed to have been fixed, there's a new one for x86_64 here: http://bugzilla.kernel.org/show_bug.cgi?id=13042 ** Bug watch added: Linux Kernel Bug Tracker #13042 http://bugzilla.kernel.org/show_bug.cgi?id=13042 -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I add the same problem as George Lesica, except the memory address where different. Everything seem to work fine for me, but the error in dmesg was still bugging me. Note that I didn't see this mtrr: type mismatch for e000,1000 old: write-back new: write- combining until I updated fglrx, the default in 8.10 does not give me this message. Anyhow, a manual mtrr modification fixed the problem but after a little more digging passing the kernel parameter enable_mtrr_cleanup did also the trick. I found a thread in the lkml talking about setting CONFIG_MTRR_SANITIZER_ENABLE_DEFAULT to 1 by default, which is the same as passing enable_mtrr_cleanup from my understanding, in kernel 2.6.30 because now kernel seem better then X to do the cleanup. Original thread: http://lkml.org/lkml/2009/2/19/108 For me the performance does not seem to change either way it just get rid of the dmesg error. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I have a thinkpad x61t with an intel video chipset. I have installed 4G of RAM. I am running Intrepid with 64-bit kernel 2.6.27-11-generic. The Intel X driver works but cannot set the frame buffer to write combining. glxgears reports 450 FPS. If I run mtrr-uncover (see above) and restart X, glxgears reports 650 FPS. So the problem still exists. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Affects Dell Hybrid Studio with 4GB system memory In Intrepid, the mtrr- uncover program in rc.local is an effective workaround. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
This is still a problem with 64-bit intrepid. However, the latest mtrr program (from above) seems to solve the problem. I am using the october version of the program rather than the version that is linked to (knock the file name off the end of the address). Now the problem is where to run that program during boot to make it so I don't have to restart X every time I boot up. I will post the output next time I reboot. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
George Lesica: your message appeared in the kernel log (dmesg) whereas the message reported in the first report is from the xorg log. I think that the message in the xorg log might vary between video drivers. The one in kernel log should be consistent. I'm surprised that you have this problem with intrepid. Have you tried my mtrr-uncover tool (see above)? You can run it with no risk as a regular user. Give it no arguments. It should print out useful information: what the mtrr's are, what it suggests they could be, and commands to make those changes. Adding the output here would be informative. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
This is apparently still a problem with the intrepid generic kernel only i get a different error in dmesg than the original poster: [ 28.428465] mtrr: type mismatch for e000,1000 old: write-back new: write-combining i went from 1gb to 4gb and my mtrr looks basically the same as the OP and the others with no 256gb section. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: linux (Ubuntu) Importance: Undecided => Medium Status: Incomplete => Triaged -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Hi Lean, I'm using the same hardware as the original poster Mika (Samsung Q45, Intel GM965 graphics, 4GB ram) and cannot confirm MTTR's beeing setup correctly in 2.6.27-9-server. I'm using the server kernel image as the generic kernel only detects 3GB of ram, but that's a different issue. With 2.6.27-9 the MTTRs are set up like this: reg00: base=0xc000 (3072MB), size=1024MB: uncachable, count=1 reg01: base=0x ( 0MB), size=4096MB: write-back, count=1 reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 After applying the changes proposed by the tool mttr-uncover from D. Hugh Redelmeier I get the following layout which allows the X-server to enable write-combining: reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x8000 (2048MB), size=1024MB: write-back, count=1 reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 reg05: base=0xd000 (3328MB), size= 256MB: write-combining, count=1 Is there anything I can test/help to resolve this issue? -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Mika, since you are the original bug reporter, care to confirm if this is still an issue with Intrepid's final release? Thanks. ** Changed in: linux (Ubuntu) Status: New => Incomplete -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I just upgraded to Ubuntu 8.10 and I no longer need my manual MTRR fix in /etc/rc.local ... everything is fine using the default config. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
2.6.27 has been ported to Hardy (a good thing: Hardy is LTS). Unfortunately, it doesn't quite work because v86d is needed. See https://bugs.launchpad.net/ubuntu/+source/linux/+bug/236937/comments/3 I've written an experimental userland program to rejig MTRRs. Read about it here: https://bugs.launchpad.net/ubuntu/+source/linux- restricted-modules-2.6.24/+bug/224404/comments/42 It won't always work: there may not be enough MTRRs. If you tell the program the address range you need unnested, it may require fewer MTRRs. Please send me feedback. Among other information, please include /proc/mtrr -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
The Ubuntu Kernel Team is planning to move to the 2.6.27 kernel for the upcoming Intrepid Ibex 8.10 release. As a result, the kernel team would appreciate it if you could please test this newer 2.6.27 Ubuntu kernel. There are one of two ways you should be able to test: 1) If you are comfortable installing packages on your own, the linux- image-2.6.27-* package is currently available for you to install and test. --or-- 2) The upcoming Alpha5 for Intrepid Ibex 8.10 will contain this newer 2.6.27 Ubuntu kernel. Alpha5 is set to be released Thursday Sept 4. Please watch http://www.ubuntu.com/testing for Alpha5 to be announced. You should then be able to test via a LiveCD. Please let us know immediately if this newer 2.6.27 kernel resolves the bug reported here or if the issue remains. More importantly, please open a new bug report for each new bug/regression introduced by the 2.6.27 kernel and tag the bug report with 'linux-2.6.27'. Also, please specifically note if the issue does or does not appear in the 2.6.26 kernel. Thanks again, we really appreicate your help and feedback. ** Tags added: cft-2.6.27 -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
The BIOS is responsible for setting up the MTRRs that map RAM cachable. In some cases it is possible to avoid using overlapping MTRRs but in general it is not. The only general solution is for X to use the PAT support appearing in linux v2.6.26. I don't know the timeframe for X moving the more general API. Very little more can be done with MTTRs because of hardware limitations. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
I think this bug and https://bugs.launchpad.net/ubuntu/+source/linux- restricted-modules-2.6.24/+bug/224404 might be the same (however this one is related to the mtrr issue with a fglrx driver). However, if one use the desktop kernel from ubuntu and memory mapping enabled combined with an ATi card (and binary drivers fglrx) the computer crashes (i.e. isn't slow). -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: linux Status: Unknown => Confirmed -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Bug watch added: Linux Kernel Bug Tracker #10508 http://bugzilla.kernel.org/show_bug.cgi?id=10508 ** Also affects: linux via http://bugzilla.kernel.org/show_bug.cgi?id=10508 Importance: Unknown Status: Unknown -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Tags added: q45 -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Unfortunately I haven't gotten arount to doing that. I'm also not sure whether it's appropriate since I'm not using a stock kernel... -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
Hi Mika, Care to provide a reference for the post you made to LKML? Thanks. -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Changed in: xserver-xorg-video-intel Status: Confirmed => Invalid -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Attachment added: "Output of dmesg with 4GB" http://launchpadlibrarian.net/13330257/dmesg.4G.txt ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Triaged => Invalid -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Attachment added: "Output of dmesg with 2GB" http://launchpadlibrarian.net/13330253/dmesg.2G.txt -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Attachment added: "Output of cat /proc/version_signature" http://launchpadlibrarian.net/13330235/version.log -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Also affects: linux-source-2.6.24 (Ubuntu) Importance: Undecided Status: New ** Changed in: linux (Ubuntu) Sourcepackagename: linux-source-2.6.24 => linux Assignee: (unassigned) => Ubuntu Kernel Team (ubuntu-kernel-team) ** Attachment added: "Output of uname -a" http://launchpadlibrarian.net/13330227/uname-a.log -- MTRRs set up incorrectly with 4GB RAM -> X slow https://bugs.launchpad.net/bugs/210780 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 210780] Re: MTRRs set up incorrectly with 4GB RAM -> X slow
** Summary changed: - X slower after upgrade to 4GB RAM + MTRRs set up incorrectly with 4GB RAM -> X slow ** Description changed: + After upgrading my Laptop to 4GB RAM my MTRRs are set up in such a way + that X can't set up a write-combining range for the video memory + anymore, causing a noticable loss of performance + + /proc/mtrr with 2GB: + reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 + reg01: base=0x7f70 (2039MB), size= 1MB: uncachable, count=1 + reg02: base=0x7f80 (2040MB), size= 8MB: uncachable, count=1 + reg03: base=0xd000 (3328MB), size= 256MB: write-combining, count=1 + + /proc/mtrr with 4GB: + reg00: base=0xc000 (3072MB), size=1024MB: uncachable, count=1 + reg01: base=0x ( 0MB), size=4096MB: write-back, count=1 + reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 + reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 + reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 + + The video memory is at 0xd000 (256MB). Note that this range is + already included in reg00 and reg01, so the X server cannot set up a + write-combining range. + + If I manually fix the ranges to look like this: + reg00: base=0xc000 (3072MB), size= 256MB: uncachable, count=1 + reg01: base=0x ( 0MB), size=2048MB: write-back, count=1 + reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 + reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 + reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 + reg05: base=0x8000 (2048MB), size=1024MB: write-back, count=1 + reg06: base=0xe000 (3584MB), size= 512MB: uncachable, count=1 + + , i.e. explicitly excluding 0xd000 (256MB) from both problematic ranges, then the X server can set up the write-combining range again: + reg00: base=0xc000 (3072MB), size= 256MB: uncachable, count=1 + reg01: base=0x ( 0MB), size=2048MB: write-back, count=1 + reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 + reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 + reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 + reg05: base=0x8000 (2048MB), size=1024MB: write-back, count=1 + reg06: base=0xe000 (3584MB), size= 512MB: uncachable, count=1 + reg07: base=0xd000 (3328MB), size= 256MB: write-combining, count=1 + + I'm not sure who is responsible for the MTRRs. Or in case of a broken + BIOS, if the kernel can sanitize them anyway. + + Original description: + - Binary package hint: xserver-xorg-video-intel Today I upgraded my RAM from 1GB to 4GB. Everything worked fine but I noticed that scrolling in Firefox and dragging windows is noticeably slower than before. I checked this again by removing 2GB and got the same results (i.e. 2GB -> fast scrolling, 4GB -> slower scrolling) I suspect it has to do with this line from the X server: (WW) intel(0): Failed to set up write-combining range (0xd000,0x1000) If this is something the kernel is responsible for, please feel free to reassign accordingly. I have no options in my BIOS to change anything that might be relevant to this (memory mapping, etc.) This is a Samsung Q45 with Intel X3100 graphics. I'll attach more debug info. ProblemType: Bug Architecture: i386 Date: Wed Apr 2 14:18:58 2008 DistroRelease: Ubuntu 8.04 Package: xserver-xorg-video-intel 2:2.2.1-1ubuntu6 PackageArchitecture: i386 ProcEnviron: SHELL=/bin/bash PATH=/home/username/bin:/home/username/bin:/home/username/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games LANG=de_DE.UTF-8 SourcePackage: xserver-xorg-video-intel Uname: Linux 2.6.24-12-server i686 ** Description changed: After upgrading my Laptop to 4GB RAM my MTRRs are set up in such a way that X can't set up a write-combining range for the video memory anymore, causing a noticable loss of performance /proc/mtrr with 2GB: reg00: base=0x ( 0MB), size=2048MB: write-back, count=1 reg01: base=0x7f70 (2039MB), size= 1MB: uncachable, count=1 reg02: base=0x7f80 (2040MB), size= 8MB: uncachable, count=1 reg03: base=0xd000 (3328MB), size= 256MB: write-combining, count=1 + (last range added by X server) /proc/mtrr with 4GB: reg00: base=0xc000 (3072MB), size=1024MB: uncachable, count=1 reg01: base=0x ( 0MB), size=4096MB: write-back, count=1 reg02: base=0x1 (4096MB), size=1024MB: write-back, count=1 reg03: base=0xbf70 (3063MB), size= 1MB: uncachable, count=1 reg04: base=0xbf80 (3064MB), size= 8MB: uncachable, count=1 The video memory is at 0xd000 (256MB). Note that this range is already included in reg00 and reg01, so the X server cannot set up a write-combining range. If I manually fix the ranges to look like this: reg00: base=0xc000 (3072MB), size= 256MB: uncachable, count=1 reg01: base=
