Re: 2.6.13-rt12: irqs hard off for 657 usecs

[Lee Revell]

On Tue, 2005-10-11 at 12:28 -0400, Lee Revell wrote:
> On Tue, 2005-10-11 at 13:20 +0200, Ingo Molnar wrote:
> > * Lee Revell <rlrevell@xxxxxxxxxxx> wrote:
> > 
> > > Something appears to have disabled IRQs for 657 usecs.
> > 
> > how hard is it to reproduce this latency?
> 
> Very easy.  Here's the current max latency.
> 
> The max latency is close to the period of the timer IRQ.  So either it's
> an instrumentation bug or something really disables IRQs for up to 1/HZ
> seconds.

I can no longer reproduce this with 2.6.14-rc4-rt1.  It seems to have
been a real IRQs disabled bug (not an instrumentation bug) as I was also
getting xruns with 2.6.13-rt12.

Lee

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