Re: [linux-audio-user] -rt IRQ handler priorities

From: Lee Revell <rlrevell@email-addr-hidden-job.com>
Date: Wed May 10 2006 - 14:03:18 EEST

On Wed, 2006-05-10 at 12:56 +0200, Thomas Gleixner wrote:
> On Wed, 2006-05-10 at 06:49 -0400, Lee Revell wrote:
> > >
> > > This is only true, when high resolution timers are enabled.
> >
> > Is there any solution for the !CONFIG_HIGH_RES_TIMERS case? I for one
> > can't use it because my hardware doesn't support it (no local APIC).
>
> What hardware platform ?
>

Via C3 mini ITX board.

> HRT works with PIT only too.

I was not aware of that.

> Otherwise you really need to chrt the
> hrtimers softirq prio statically.
>

The problem was that setting the thread's priority to 99 caused long
latencies every 10 minutes when rt_secret_rebuild() ran, as if the timer
callbacks that do real work and the ones that just deliver a signal are
all running from the softirq timer thread.

Lee

> tglx
>
>
>
Received on Wed May 10 16:15:05 2006

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