From: Lee Revell <rlrevell@joe-job.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: 2.6.13-rt12: irqs hard off for 657 usecs
Date: Tue, 11 Oct 2005 14:44:28 -0400 [thread overview]
Message-ID: <1129056268.4718.1.camel@mindpipe> (raw)
In-Reply-To: <1129048106.12702.21.camel@mindpipe>
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@joe-job.com> 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
next prev parent reply other threads:[~2005-10-11 18:44 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-10-07 22:38 2.6.13-rt12: irqs hard off for 657 usecs Lee Revell
2005-10-08 11:58 ` Ingo Molnar
2005-10-08 12:33 ` Danny ter Haar
2005-10-08 13:08 ` Felix Oxley
2005-10-08 13:24 ` Danny ter Haar
2005-10-11 11:20 ` Ingo Molnar
2005-10-11 16:28 ` Lee Revell
2005-10-11 18:44 ` Lee Revell [this message]
2005-10-11 19:53 ` Ingo Molnar
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