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From: Andrew Morton <akpm@osdl.org>
To: Lee Revell <rlrevell@joe-job.com>
Cc: mingo@elte.hu, linux-audio-dev@music.columbia.edu, arjanv@redhat.com,
       linux-kernel@vger.kernel.org
Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel
 Preemption Patch
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Lee Revell <rlrevell@joe-job.com> wrote:
>
>  discovered I can reliably produce a large XRUN by toggling Caps Lock, 
> Scroll Lock, or Num Lock.  This is with 2.6.8-rc1-mm1 + voluntary
> preempt

That's odd.  I wonder if the hardware is sick.  What is the duration is the
underrun?  The info you sent didn't include that.

> (I modified the patch by hand to apply on this kernel, as
> 2.6.8-rc2 disables my network card).

eh?  That's a rather more serious problem.  Does the via-rhine.c from
2.6.8-rc1-mm1 work OK if you move it into 2.6.8-rc2?


> 
> ALSA /home/rlrevell/cvs/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
>  [<c01066f7>] dump_stack+0x17/0x20
>  [<de952477>] snd_pcm_period_elapsed+0x2c7/0x400 [snd_pcm]
>  [<de962477>] snd_emu10k1_interrupt+0x337/0x3c0 [snd_emu10k1]
>  [<c0107913>] handle_IRQ_event+0x33/0x60
>  [<c0107c55>] do_IRQ+0xa5/0x170
>  [<c01062b8>] common_interrupt+0x18/0x20
>  [<c01d3f7f>] __delay+0xf/0x20
>  [<c021881a>] atkbd_sendbyte+0x5a/0xa0
>  [<c0218a35>] atkbd_command+0x1d5/0x200
>  [<c0218bcb>] atkbd_event+0x16b/0x200
>  [<c0215a95>] input_event+0x115/0x3d0
>  [<c01ecaeb>] kbd_bh+0xbb/0x160
>  [<c011a554>] tasklet_action+0x44/0x70
>  [<c011a303>] __do_softirq+0x83/0x90
>  [<c011a345>] do_softirq+0x35/0x40
>  [<c0107cc5>] do_IRQ+0x115/0x170
>  [<c01062b8>] common_interrupt+0x18/0x20
>  [<c014b95e>] sys_read+0x2e/0x50