Messages in this thread | | | Subject | Re: 2.6.21 known regressions (v2) (for -stable team) | From | Thomas Gleixner <> | Date | Sat, 28 Apr 2007 22:04:31 +0200 |
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On Sat, 2007-04-28 at 20:10 +0200, Thomas Meyer wrote: > Thomas Gleixner schrieb: > > On Sat, 2007-04-28 at 18:27 +0200, Michal Piotrowski wrote: > > > >> Subject : Bad interaction between dynticks and amarok? > >> References : http://lkml.org/lkml/2007/4/26/307 > >> Submitter : Thomas Meyer <thomas.mey@web.de> > >> Status : Unknow > >> > > > > Michal, > > > > I don't think this is a regression. What Thomas wanted to point out is, > > that the amarok / sound device is making the positive effect of dynticks > > moot, as it starts to trigger useless interrupts. > > > > Thomas, is my interpretation correct ? Did you check, which interrupt > > was increasing - i.e. was it the soundcard one ? > > > No, it wasn't the soundcard one. but i had this effect with amarok and > audacious... so, i guessed... which was wrong. > > It's the timer interrupt (+50-70 timer interrupts). But i'm not sure > what both applications are doing, while they are "idle"...
Ok, so amarok is one of those applications which arm timers for no obvious reason. If you enable CONFIG_TIMER_STATS in the kernel, you can analyse the timer offenders via the /proc/timer_stats interface.
tglx
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