Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

Lee Revell
2004-07-13T02:52:43Z

On Mon, 2004-07-12 at 20:46, Andrew Morton wrote:
> Lee Revell <rlrevell@joe-job.com> wrote:
> >
> > > resierfs: yes, it's a problem. I "fixed" it multiple times in 2.4, but the
> > > fixes ended up breaking the fs in subtle ways and I eventually gave up.
> > >
> >
> > Interesting. There is an overwhelming consensus amongst Linux audio
> > folks that you should use reiserfs for low latency work.
>
> It seems to be misplaced. A simple make-a-zillion-teeny-files test here
> exhibits a 14 millisecond holdoff.
>
> > Should I try ext3?
>
> ext3 is certainly better than that, but still has a couple of potential
> problem spots. ext2 is probably the best at this time.
>

Here are a few more:

Jul 12 22:20:41 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
Jul 12 22:20:41 mindpipe kernel: [__crc_totalram_pages+1387264/5353478] snd_pcm_period_elapsed+0x2ca/0x410 [snd_pcm]
Jul 12 22:20:41 mindpipe kernel: [__crc_totalram_pages+1455070/5353478] snd_emu10k1_interrupt+0x3c8/0x480 [snd_emu10k1]
Jul 12 22:20:41 mindpipe kernel: [handle_IRQ_event+49/96] handle_IRQ_event+0x31/0x60
Jul 12 22:20:41 mindpipe kernel: [do_IRQ+155/352] do_IRQ+0x9b/0x160
Jul 12 22:20:41 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
Jul 12 22:20:41 mindpipe kernel: [unix_stream_recvmsg+135/1088] unix_stream_recvmsg+0x87/0x440
Jul 12 22:20:41 mindpipe kernel: [avc_has_perm+72/96] avc_has_perm+0x48/0x60
Jul 12 22:20:41 mindpipe kernel: [sock_aio_read+155/176] sock_aio_read+0x9b/0xb0
Jul 12 22:20:41 mindpipe kernel: [do_sync_read+125/192] do_sync_read+0x7d/0xc0
Jul 12 22:20:41 mindpipe kernel: [do_select+435/752] do_select+0x1b3/0x2f0
Jul 12 22:20:41 mindpipe kernel: [vfs_read+223/256] vfs_read+0xdf/0x100
Jul 12 22:20:42 mindpipe kernel: [sys_read+45/80] sys_read+0x2d/0x50
Jul 12 22:20:42 mindpipe kernel: [syscall_call+7/11] syscall_call+0x7/0xb
Jul 12 22:20:42 mindpipe kernel:
Jul 12 22:20:44 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
Jul 12 22:20:44 mindpipe kernel: [__crc_totalram_pages+1387264/5353478] snd_pcm_period_elapsed+0x2ca/0x410 [snd_pcm]
Jul 12 22:20:44 mindpipe kernel: [__crc_totalram_pages+1455070/5353478] snd_emu10k1_interrupt+0x3c8/0x480 [snd_emu10k1]
Jul 12 22:20:44 mindpipe kernel: [handle_IRQ_event+49/96] handle_IRQ_event+0x31/0x60
Jul 12 22:20:44 mindpipe kernel: [do_IRQ+155/352] do_IRQ+0x9b/0x160
Jul 12 22:20:44 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
Jul 12 22:20:44 mindpipe kernel:
Jul 12 22:20:49 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
Jul 12 22:20:49 mindpipe kernel: [__crc_totalram_pages+1387264/5353478] snd_pcm_period_elapsed+0x2ca/0x410 [snd_pcm]
Jul 12 22:20:49 mindpipe kernel: [__crc_totalram_pages+1455070/5353478] snd_emu10k1_interrupt+0x3c8/0x480 [snd_emu10k1]
Jul 12 22:20:49 mindpipe kernel: [handle_IRQ_event+49/96] handle_IRQ_event+0x31/0x60
Jul 12 22:20:49 mindpipe kernel: [do_IRQ+155/352] do_IRQ+0x9b/0x160
Jul 12 22:20:49 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
Jul 12 22:20:49 mindpipe kernel:

Lee