Hi,
running old and new powertop in the same session shows that the patch
works - powertop monitors the frequency changes.
Still strange thing is that the most of time, like 95-99% is spent in
the lowest frequency according powertop and the reported top cause for
wakeups is i915 driver. But idle time reported by vmstat is 0 for the
most of time, with aprox. 80% CPU time spent in userspace.
Best regards,
Milan
Li, Aubrey píše v út 10. 08. 2010 v 19:50 +0800:
> Hi Milan,
>
> This is a powertop bug. Please file a bug against it. Can you help to verify
> if the attached
> binary fixed the problem on your side?
>
> The patch is as follows, if it fixed the problem, can you help to put it back?
>
> Thanks,
> -Aubrey
>
> diff -r 87e07d18c459 usr/src/cmd/powertop/common/powertop.c
> --- a/usr/src/cmd/powertop/common/powertop.c Mon Jul 19 19:56:37 2010 -0700
> +++ b/usr/src/cmd/powertop/common/powertop.c Tue Aug 10 03:26:26 2010 +0800
> @@ -397,7 +397,8 @@
> * specified an interval we skip this bit and keep it fixed.
> */
> if (g_features & FEATURE_CSTATE && !PT_ON_TIME &&
> - g_longest_cstate > 0) {
> + g_longest_cstate > 0 &&
> + g_cstate_info[g_longest_cstate].events > 0) {
> double deep_idle_res = (((double)
>
> g_cstate_info[g_longest_cstate].total_time/MICROSEC
> /g_ncpus)/g_cstate_info[g_longest_cstate].events);
>
>
>
> >
> > Hi,
> >
> > Li, Aubrey píše v po 09. 08. 2010 v 09:09 +0800:
> > > Milan Jurik wrote:
> > > >
> > > > Hi,
> > > >
> > > > during playing with new build 145 I discovered strange thing:
> > > >
> > > > C0 (cpu running) (100.0%) 1000 Mhz
> > > > 100.0%
> > > > C1 0.0ms (0.0%) 1333 Mhz
> > > > 0.0%
> > > > 1667 Mhz
> > > > 0.0%
> > > >
> > > > Also kstat indicates that system is running on 1GHz only. No difference
> > > > between poll-mode and default.
> > >
> > > Is powertop freezing? did you see the change of Top causes for wakeups?
> >
> > This is interesting. I did not expect it because other commands were
> > redrawing but I missed it. When I tried to reproduce it this morning,
> > for the first time I saw different percentages than 100, 0, 0, and
> > powertop stops to redraw the values (including top part). Also, in
> > aprox. one from five cases I run kstat, I see current_clock_Hz going to
> > the maximum value, for the rest of time it remains on 1GHz - no idea why
> > because harddisk seems to be inactive and compilation is running. Also
> > again it does not depend on poll-mode or default.
> >
> > > 100% C0 residency indicated the system has 100% cpu utilization.
> > >
> >
> > Yes, I would expect it.
> >
> > > when you used poll-mode, did you set cpu-threshold to 1s in
> > > /etc/power.conf?
> >
> > Yes.
> >
> > > It would be interesting to see how the compilation caused 100% cpu
> > utilization.
> >
> > Do you know SFE repo? SFEboost.spec is my test case
> >
> > > I tried to do the nightly, everything works fine. Can you give more
> > > details how
> > > to replicate this issue?
> > >
> >
> > What system did you use for replication of the issue? My system has some
> > memory limits (ZFS, Gnome desktop, 4GB of RAM) and 2 cores and standard
> > laptop harddisk (but that seems to be not active during build much, it
> > goes to memory cache).
> >
> > > By the way, we didn't change cpupm related code for a long time, does this
> > issue
> > > exist on the other build?
> > >
> >
> > I saw it in build 145 the first time, but I did not use previous few
> > builds for this type of workload. I can look at older builds if
> > necessary.
> >
> > > Thanks,
> > > -Aubrey
> > >
> >
> > Best regards,
> >
> > Milan
> >
> > > >
> > > > This combination happen when I run intensive compilations (build of
> > > > boost with Sun Studio). And it is very strange even more, typical output
> > > > of prstat:
> > > >
> > > > 9667 mj162486 66M 62M cpu0 30 0 0:00:06 13%
> > ccfe/1
> > > > 9671 mj162486 60M 55M run 21 0 0:00:05 11%
> > ccfe/1
> > > >
> > > > but top reports:
> > > >
> > > > 9643 mj162486 1 31 0 63M 59M run 0:05
> > 46.59%
> > > > ccfe
> > > > 9650 mj162486 1 22 0 48M 44M run 0:02
> > 26.60%
> > > > ccfe
> > > >
> > > > Basically I see much smaller values of CPU usage in prstat than in top.
> > > > And I am pretty sure that in reality the CPU (Intel C2D in Thinkpad T60)
> > > > is very busy (also Gnome applet shows full load).
> > > >
> > > > If I break compilation and do some "normal" work like browsing, powertop
> > > > shows some changes in frequency to higher values.
> > > >
> > > > Best regards,
> > > >
> > > > Milan
> > > >
> > > > _______________________________________________
> > > > pm-discuss mailing list
> > > > [email protected]
> > > > http://mail.opensolaris.org/mailman/listinfo/pm-discuss
> >
>
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