From: Takashi Iwai <tiwai@suse.de>
To: Andrew Morton <akpm@osdl.org>
Cc: Lee Revell <rlrevell@joe-job.com>, linux-kernel@vger.kernel.org
Subject: Re: Ext3 vs. ReiserFS results (was Re: XRUN traces)
Date: Wed, 14 Jul 2004 12:43:37 +0200 [thread overview]
Message-ID: <s5hd62yamxy.wl@alsa2.suse.de> (raw)
In-Reply-To: <20040713175833.6ab037ef.akpm@osdl.org>
At Tue, 13 Jul 2004 17:58:33 -0700,
Andrew Morton wrote:
>
> Lee Revell <rlrevell@joe-job.com> wrote:
> >
> > Jul 13 19:51:45 mindpipe kernel: ALSA /usr/src/alsa-cvs-1.0.5/alsa-driver/alsa-kernel/core/pcm_lib.c:169: XRUN: pcmC0D0p
> > Jul 13 19:51:45 mindpipe kernel: [dump_stack+23/32] dump_stack+0x17/0x20
> > Jul 13 19:51:45 mindpipe kernel: [__crc_totalram_pages+562733/3558647] snd_pcm_period_elapsed+0x2c7/0x400 [snd_pcm]
> > Jul 13 19:51:45 mindpipe kernel: [__crc_totalram_pages+631725/3558647] snd_emu10k1_interrupt+0x377/0x400 [snd_emu10k1]
> > Jul 13 19:51:45 mindpipe kernel: [handle_IRQ_event+51/96] handle_IRQ_event+0x33/0x60
> > Jul 13 19:51:45 mindpipe kernel: [do_IRQ+165/368] do_IRQ+0xa5/0x170
> > Jul 13 19:51:45 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
> > Jul 13 19:51:45 mindpipe kernel: [d_callback+29/64] d_callback+0x1d/0x40
> > Jul 13 19:51:45 mindpipe kernel: [rcu_do_batch+62/80] rcu_do_batch+0x3e/0x50
> > Jul 13 19:51:45 mindpipe kernel: [rcu_process_callbacks+150/256] rcu_process_callbacks+0x96/0x100
> > Jul 13 19:51:45 mindpipe kernel: [tasklet_action+68/112] tasklet_action+0x44/0x70
> > Jul 13 19:51:45 mindpipe kernel: [__do_softirq+131/144] __do_softirq+0x83/0x90
> > Jul 13 19:51:45 mindpipe kernel: [do_softirq+53/64] do_softirq+0x35/0x40
> > Jul 13 19:51:45 mindpipe kernel: [do_IRQ+277/368] do_IRQ+0x115/0x170
> > Jul 13 19:51:45 mindpipe kernel: [common_interrupt+24/32] common_interrupt+0x18/0x20
> > Jul 13 19:51:45 mindpipe kernel: [poll_freewait+46/80] poll_freewait+0x2e/0x50
> > Jul 13 19:51:45 mindpipe kernel: [sys_poll+472/544] sys_poll+0x1d8/0x220
>
> This one's going to be a problem. It's due to RCU freeing a large number
> of dentries in one hit.
The recent patches to daemonize softirq may help?
There was a discussion on LKML (on March?) about the latency
improvement of RCU. Rearming the tasklet fixed the latency problem
indeed.
Takashi
next prev parent reply other threads:[~2004-07-14 10:45 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-13 22:38 XRUN traces Lee Revell
2004-07-13 23:10 ` Andrew Morton
2004-07-14 0:51 ` Ext3 vs. ReiserFS results (was Re: XRUN traces) Lee Revell
2004-07-14 0:58 ` Andrew Morton
2004-07-14 1:18 ` Lee Revell
2004-07-14 10:43 ` Takashi Iwai [this message]
2004-07-14 6:45 ` XRUN traces Lee Revell
2004-07-14 6:56 ` Andrew Morton
2004-07-14 15:24 ` Lee Revell
2004-07-17 1:04 ` Lee Revell
2004-07-17 3:15 ` Lee Revell
2004-07-13 23:16 ` Lee Revell
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