From: Arjan van de Ven <arjan@infradead.org>
To: Ben Gamari <bgamari.foss@gmail.com>
Cc: linux-kernel@vger.kernel.org, tytso@mit.edu, npiggin@suse.de,
mingo@elte.hu, Ruald Andreae <ruald.a@gmail.com>,
Jens Axboe <jens.axboe@oracle.com>, Olly Betts <olly@survex.com>,
martin f krafft <madduck@madduck.net>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing
Date: Sat, 27 Mar 2010 20:42:33 -0700 [thread overview]
Message-ID: <20100327204233.0d84542a@infradead.org> (raw)
In-Reply-To: <4baeaee5.c5c2f10a.7187.2688@mx.google.com>
On Sat, 27 Mar 2010 18:20:37 -0700 (PDT)
Ben Gamari <bgamari.foss@gmail.com> wrote:
> Hey all,
>
> I have posted another profile[1] from an incident yesterday. As you
> can see, both swapper and init (strange?) show up prominently in the
> profile. Moreover, most processes seem to be in blk_peek_request a
> disturbingly large percentage of the time. Both of these profiles
> were taken with 2.6.34-rc kernels.
>
> Anyone have any ideas on how to proceed? Is more profile data
> necessary? Are the existing profiles at all useful? Thanks,
profiles tend to be about cpu usage... and are rather poor to deal with
anything IO related.
latencytop might get closer in giving useful information....
(btw some general suggestion.. make sure you're using noatime or
relatime as mount option)
--
Arjan van de Ven Intel Open Source Technology Centre
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2010-03-28 3:41 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-03-16 15:31 Ben Gamari
2010-03-17 1:24 ` tytso
2010-03-17 3:18 ` Ben Gamari
2010-03-17 3:30 ` tytso
2010-03-17 4:31 ` Ben Gamari
2010-03-26 3:16 ` Ben Gamari
2010-03-17 4:53 ` Nick Piggin
2010-03-17 9:37 ` Ingo Molnar
2010-03-26 3:31 ` Ben Gamari
2010-04-09 15:21 ` Ben Gamari
2010-03-26 3:28 ` Ben Gamari
2010-03-23 19:51 ` Jesper Krogh
2010-03-26 3:13 ` Ben Gamari
2010-03-28 1:20 ` Ben Gamari
2010-03-28 1:29 ` Ben Gamari
2010-03-28 3:42 ` Arjan van de Ven [this message]
2010-03-28 14:06 ` Ben Gamari
2010-03-28 22:08 ` Andi Kleen
2010-04-09 14:56 ` Ben Gamari
2010-04-11 15:03 ` Avi Kivity
2010-04-11 16:35 ` Ben Gamari
2010-04-11 17:20 ` Andi Kleen
2010-04-11 18:16 ` Thomas Gleixner
2010-04-11 18:42 ` Andi Kleen
2010-04-11 21:54 ` Thomas Gleixner
2010-04-11 23:43 ` Hans-Peter Jansen
2010-04-12 0:22 ` Dave Chinner
2010-04-14 18:40 ` Ric Wheeler
2010-03-23 11:28 Pawel S
2010-03-23 13:27 ` Jens Axboe
2010-03-26 3:35 ` Ben Gamari
2010-03-30 10:46 ` Pawel S
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