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Date: Wed, 25 Mar 2009 17:57:46 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Theodore Tso <tytso@mit.edu>, Jan Kara <jack@suse.cz>,
       Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@elte.hu>,
       Arjan van de Ven <arjan@infradead.org>,
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       Jens Axboe <jens.axboe@oracle.com>, David Rees <drees76@gmail.com>,
       Jesper Krogh <jesper@krogh.cc>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Linux 2.6.29
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> The fsync() problem is really annoying, but what is doubly annoying is 
> that sometimes one process doing fsync() (or sync) seems to cause other 
> processes to hickup too. 

Bug #5942 (interaction with anticipatory io scheduler)
Bug #9546 (with reproducer & logs)
Bug #9911 including a rather natty tester (albeit in java)
Bug #7372 (some info and figures on certain revs it seemed to get worse)
Bug #12309 (more info, including kjournald hack fix using ioprio)

General consensus seems to be 2.6.18 is where the manure intersected with
the air impeller
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