From: Christoph Hellwig <hch@infradead.org>
To: Pekka Enberg <penberg@kernel.org>
Cc: Aidar Kultayev <the.aidar@gmail.com>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
npiggin@kernel.dk, Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.36 io bring the system to its knees
Date: Thu, 28 Oct 2010 09:46:41 -0400 [thread overview]
Message-ID: <20101028134641.GA4416@infradead.org> (raw)
In-Reply-To: <AANLkTikx4zZwMLiAUrGKcH6yoo_PGgRA7nT9BzYMxQ89@mail.gmail.com>
On Thu, Oct 28, 2010 at 02:48:20PM +0300, Pekka Enberg wrote:
> On Thu, Oct 28, 2010 at 2:33 PM, Aidar Kultayev <the.aidar@gmail.com> wrote:
> > if it wasn't picasa, it would have been something else. I mean if I
> > kill picasa ( later on it was done indexing new pics anyway ), it
> > would have been for virtualbox to thrash the io. So, nope, getting rid
> > of picasa doesn't help either. In general the systems responsiveness
> > or sluggishness is dominated by those io operations going on - the DD
> > & CP & probably VBOX issuing whole bunch of its load for IO.
>
> Do you still see high latencies in vfs_lseek() and vfs_fsync()? I'm
> not a VFS expert but looking at your latencytop output, it seems that
> fsync grabs ->i_mutex which blocks vfs_llseek(), for example. I'm not
> sure why that causes high latencies though it's a mutex we're holding.
It does. But what workload does a lot of llseeks while fsyncing the
same file? I'd bet some application is doing really stupid things here.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@infradead.org>
To: Pekka Enberg <penberg@kernel.org>
Cc: Aidar Kultayev <the.aidar@gmail.com>, Ingo Molnar <mingo@elte.hu>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
npiggin@kernel.dk, Dave Chinner <david@fromorbit.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: 2.6.36 io bring the system to its knees
Date: Thu, 28 Oct 2010 09:46:41 -0400 [thread overview]
Message-ID: <20101028134641.GA4416@infradead.org> (raw)
In-Reply-To: <AANLkTikx4zZwMLiAUrGKcH6yoo_PGgRA7nT9BzYMxQ89@mail.gmail.com>
On Thu, Oct 28, 2010 at 02:48:20PM +0300, Pekka Enberg wrote:
> On Thu, Oct 28, 2010 at 2:33 PM, Aidar Kultayev <the.aidar@gmail.com> wrote:
> > if it wasn't picasa, it would have been something else. I mean if I
> > kill picasa ( later on it was done indexing new pics anyway ), it
> > would have been for virtualbox to thrash the io. So, nope, getting rid
> > of picasa doesn't help either. In general the systems responsiveness
> > or sluggishness is dominated by those io operations going on - the DD
> > & CP & probably VBOX issuing whole bunch of its load for IO.
>
> Do you still see high latencies in vfs_lseek() and vfs_fsync()? I'm
> not a VFS expert but looking at your latencytop output, it seems that
> fsync grabs ->i_mutex which blocks vfs_llseek(), for example. I'm not
> sure why that causes high latencies though it's a mutex we're holding.
It does. But what workload does a lot of llseeks while fsyncing the
same file? I'd bet some application is doing really stupid things here.
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next prev parent reply other threads:[~2010-10-28 13:47 UTC|newest]
Thread overview: 130+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <AANLkTimt7wzR9RwGWbvhiOmot_zzayfCfSh_-v6yvuAP@mail.gmail.com>
2010-10-26 13:00 ` Fwd: 2.6.36 io bring the system to its knees Aidar Kultayev
[not found] ` <AANLkTinzJ9a+9w7G5X0uZpX2o-L8E6XW98VFKoF1R_-S@mail.gmail.com>
2010-10-28 6:09 ` Aidar Kultayev
2010-10-28 6:32 ` Pekka Enberg
2010-10-28 6:32 ` Pekka Enberg
2010-10-28 9:00 ` Ingo Molnar
2010-10-28 9:00 ` Ingo Molnar
2010-10-28 9:34 ` Pekka Enberg
2010-10-28 9:34 ` Pekka Enberg
2010-10-28 11:16 ` Pekka Enberg
2010-10-28 11:16 ` Pekka Enberg
2010-10-28 11:33 ` Aidar Kultayev
2010-10-28 11:33 ` Aidar Kultayev
2010-10-28 11:48 ` Pekka Enberg
2010-10-28 11:48 ` Pekka Enberg
2010-10-28 12:18 ` Aidar Kultayev
2010-10-28 12:18 ` Aidar Kultayev
2010-10-28 13:46 ` Christoph Hellwig [this message]
2010-10-28 13:46 ` Christoph Hellwig
2010-10-28 13:54 ` Ingo Molnar
2010-10-28 13:54 ` Ingo Molnar
2010-10-28 13:30 ` Ingo Molnar
2010-10-28 13:30 ` Ingo Molnar
2010-10-28 13:47 ` Christoph Hellwig
2010-10-28 13:47 ` Christoph Hellwig
2010-10-28 13:50 ` Ingo Molnar
2010-10-28 13:50 ` Ingo Molnar
2010-10-28 17:01 ` Chris Mason
2010-10-28 17:01 ` Chris Mason
2010-10-28 17:57 ` Pekka Enberg
2010-10-28 17:57 ` Pekka Enberg
2010-10-29 14:52 ` Ted Ts'o
2010-10-29 14:52 ` Ted Ts'o
2010-10-29 15:33 ` Aidar Kultayev
2010-10-29 15:33 ` Aidar Kultayev
2010-10-30 9:14 ` Ingo Molnar
2010-10-30 9:14 ` Ingo Molnar
2010-10-30 13:02 ` Aidar Kultayev
2010-10-30 13:02 ` Aidar Kultayev
2010-10-30 19:06 ` Chris Mason
2010-10-30 19:06 ` Chris Mason
2010-10-31 2:31 ` Ted Ts'o
2010-10-31 2:31 ` Ted Ts'o
2010-10-31 17:49 ` Corrado Zoccolo
2010-10-31 17:49 ` Corrado Zoccolo
2010-11-02 3:10 ` Shaohua Li
2010-11-02 3:10 ` Shaohua Li
2010-11-02 11:47 ` Sanjoy Mahajan
2010-11-02 11:47 ` Sanjoy Mahajan
2010-11-02 13:12 ` Chris Mason
2010-11-02 13:12 ` Chris Mason
2010-11-04 16:05 ` Sanjoy Mahajan
2010-11-04 16:05 ` Sanjoy Mahajan
2010-11-04 23:35 ` Steven Barrett
2010-11-04 23:35 ` Steven Barrett
2010-11-04 23:44 ` Jesper Juhl
2010-11-04 23:44 ` Jesper Juhl
2010-11-04 23:48 ` Jesper Juhl
2010-11-04 23:48 ` Jesper Juhl
2010-11-05 1:43 ` Dave Chinner
2010-11-05 1:43 ` Dave Chinner
2010-11-05 12:48 ` Sanjoy Mahajan
2010-11-05 12:48 ` Sanjoy Mahajan
2010-11-06 14:10 ` dave b
2010-11-06 14:10 ` dave b
2010-11-06 15:12 ` Dave Chinner
2010-11-06 15:12 ` Dave Chinner
2010-11-07 6:06 ` dave b
2010-11-07 6:06 ` dave b
2010-11-07 12:08 ` Jens Axboe
2010-11-07 12:08 ` Jens Axboe
2010-11-07 15:50 ` Linus Torvalds
2010-11-07 15:50 ` Linus Torvalds
2010-11-10 1:32 ` Dave Chinner
2010-11-10 1:32 ` Dave Chinner
2010-11-10 2:01 ` dave b
2010-11-10 2:01 ` dave b
2010-11-10 8:08 ` Evgeniy Ivanov
2010-11-10 8:08 ` Evgeniy Ivanov
2010-11-10 8:24 ` Dave Chinner
2010-11-10 8:24 ` Dave Chinner
2010-11-10 14:22 ` Pavel Machek
2010-11-10 14:22 ` Pavel Machek
2010-11-10 14:20 ` Pavel Machek
2010-11-10 14:20 ` Pavel Machek
2010-11-10 14:27 ` Ingo Molnar
2010-11-10 14:27 ` Ingo Molnar
2010-11-10 14:55 ` Christoph Hellwig
2010-11-10 14:55 ` Christoph Hellwig
2010-11-10 19:09 ` Pavel Machek
2010-11-10 19:09 ` Pavel Machek
2010-11-10 14:33 ` Theodore Tso
2010-11-10 14:33 ` Theodore Tso
2010-11-10 14:57 ` Christoph Hellwig
2010-11-10 14:57 ` Christoph Hellwig
2010-11-10 15:00 ` Chris Mason
2010-11-10 15:00 ` Chris Mason
2010-11-10 23:36 ` Dave Chinner
2010-11-10 23:36 ` Dave Chinner
2010-11-10 15:59 ` Linus Torvalds
2010-11-10 15:59 ` Linus Torvalds
2010-11-10 16:46 ` Alexey Dobriyan
2010-11-10 16:46 ` Alexey Dobriyan
2010-11-10 16:55 ` Linus Torvalds
2010-11-10 16:55 ` Linus Torvalds
2010-11-10 17:10 ` Alexey Dobriyan
2010-11-10 17:10 ` Alexey Dobriyan
2010-11-10 18:55 ` Mark Lord
2010-11-10 18:55 ` Mark Lord
2010-11-10 18:27 ` Mike Galbraith
2010-11-10 18:27 ` Mike Galbraith
2010-11-10 23:43 ` Dave Chinner
2010-11-10 23:43 ` Dave Chinner
2010-11-06 19:10 ` Arjan van de Ven
2010-11-06 19:10 ` Arjan van de Ven
2010-11-07 17:16 ` Jesper Juhl
2010-11-07 17:16 ` Jesper Juhl
2010-11-09 19:47 ` Evgeniy Ivanov
2010-11-09 19:47 ` Evgeniy Ivanov
2010-11-09 20:20 ` Christoph Hellwig
2010-11-09 20:20 ` Christoph Hellwig
2010-11-09 21:00 ` Chris Mason
2010-11-09 21:00 ` Chris Mason
2010-10-31 1:22 ` Wu Fengguang
2010-10-31 1:22 ` Wu Fengguang
2010-10-31 1:51 ` Wu Fengguang
2010-10-31 1:51 ` Wu Fengguang
2010-11-01 1:09 ` Dimitrios Apostolou
2010-11-01 1:09 ` Dimitrios Apostolou
2010-11-02 1:20 ` Wu Fengguang
2010-11-02 1:20 ` Wu Fengguang
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