linux-kernel - Re: Poor interactive performance with I/O loads with fsync()ing

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Date:	Sat, 27 Mar 2010 18:20:37 -0700 (PDT)
From:	Ben Gamari <bgamari.foss@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	tytso@....edu, npiggin@...e.de, mingo@...e.hu,
	Ruald Andreae <ruald.a@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Olly Betts <olly@...vex.com>,
	martin f krafft <madduck@...duck.net>
Subject: Re: Poor interactive performance with I/O loads with fsync()ing

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,

- Ben
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