linux-kernel - Re: Linux 2.6.29

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Date:	Wed, 25 Mar 2009 17:57:46 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Theodore Tso <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Arjan van de Ven <arjan@...radead.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

> 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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