lkml.org 
[lkml]   [2010]   [Dec]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [2.6.37-rc5] Timer or ICE1724 issues, HZ=250, NO_HZ=y
On Mon, 13 Dec 2010, Markus Trippelsdorf wrote:
> On 2010.12.13 at 02:54 -0800, Simon Kirby wrote:
> > With Linus git HEAD just compiled earlier today, I noticed a weird issue
> > just now while in the middle of some coding. I think this may have
> > happened before (maybe in 2.6.36), but not as obvious as this time.
> >
> > The music that was playing stopped, and the key I had just pressed did
> > not show up in rxvt. I figured the machine had hung, but I hit another
> > key and the music played again for another second and my _previous_
> > keystroke output appeared.
> >
> > Looking at /proc/interrupts, "timer" had completely stopped. "perf top"
> > showed "snd_pcm_hwsync" was at the top of the profile with about 80%
> > usage. Spinning in "snd_pcm_stream_lock_irq" from other CPUs, probably..
> >
> > dmesg showed:
> >
> > [13995.498393] Clocksource tsc unstable (delta = -8589909196 ns)
> > [13995.511452] Switching to clocksource hpet
> > [14039.525074] NOHZ: local_softirq_pending 100
> > [14039.882183] hrtimer: interrupt took 30800 ns
> > [14134.540724] NOHZ: local_softirq_pending 100
>
> Welcome to the club. This is a known problem on newer AMD systems see:
> http://thread.gmane.org/gmane.linux.kernel/1054283
> and the following patch:
> http://thread.gmane.org/gmane.linux.kernel/1069458
>
> But the real problem is that no patch found its way to Linus yet and
> 2.6.37 will be released in a few days.
>
> I think Thomas' solution (with a hardcoded hpet_min_tick):
> return res < 128 ? -ETIME : 0;
> is the only sane option left this late in the series.

Yeah. I push that out to Linus. At some point we might hopefully get
some reliable information from the HW folks.

Thanks,

tglx


\
 
 \ /
  Last update: 2010-12-13 12:27    [W:0.042 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site