* john stultz <[email protected]> wrote:
> On Wed, 2007-01-24 at 10:41 +0100, John wrote:
> > I'm using the POSIX timers API. My platform is x86 running Linux
> > 2.6.18.6 patched with the high-resolution timer subsystem.
> >
> > http://www.tglx.de/hrtimers.html
> > My process is the only SCHED_FIFO process on the system. There are
> > no user-space processes with a higher priority. AFAICT, only a
> > kernel thread could keep the CPU away from my app.
> >
> > Is there a periodic kernel thread that runs every 2 seconds, cannot
> > be preempted, and runs for over 50 µs??
>
> This sounds like a BIOS SMI issue. Can you reproduce this behavior on
> different hardware?
note that only the -hrt patchset is used - not the full -rt patchset -
so 50 usecs delays (and more) are quite possible and common.
My question would be: does the same problem occur with the full -rt
patchset and PREEMPT_RT? (see http://rt.wiki.kernel.org for details)
Ingo
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