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SubjectRe: [PATCH 00/18] tracing/ring-buffer: fixes for latency tracer [2.6.32]
On Mon, Sep 07, Frederic Weisbecker wrote:

> On Mon, Sep 07, 2009 at 12:20:50PM +0200, Jan Blunck wrote:
> > On Sat, Sep 5, 2009 at 5:06 PM, Arnaldo Carvalho de Melo<acme@redhat.com> wrote:
> > >
> > > I did a quick port to tip/rt/head and couldn't reproduce the problems I
> > > was experiencing, thanks!
> > >
> > > I've put the ported patch series at:
> > >
> > > http://userweb.kernel.org/~acme/rostedt-rb-rt
> > >
> >
> > Nice, this also seems to fix my problem with the hanging wakup
> > selftest. At least the system continues to boot. However, I still get
> > this:
> >
> > [ 13.739115] Testing tracer sched_switch: PASSED
> > [ 14.002071] Testing tracer function: PASSED
> > [ 14.158816] Testing dynamic ftrace: PASSED
> > [ 14.512524] Testing tracer irqsoff: PASSED
> > [ 14.693519] Testing tracer preemptoff: PASSED
> > [ 14.853519] Testing tracer preemptirqsoff: PASSED
> > [ 15.013506] Testing tracer wakeup:
> > [ 15.134004] hrtimer: interrupt too slow, forcing clock min delta to
> > 27508383 ns
>
>
>
> Ah, Ulrich Lukas also reported me such warnings. I would like to
> track the reason of these messages (the hrtimer hanging detection
> seems to warn too early).
>
> Could you please send me your config, I hope I could reproduce it.
>

I only see that on one of my systems, a 32 core Opteron and not on my 8
core. So it seems that size does matter ...
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