linux-kernel - Re: Linux 2.6.29

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Message-ID: <72dbd3150903251059xc1fbc04qb1335e33bb0a2732@mail.gmail.com>
Date:	Wed, 25 Mar 2009 10:59:57 -0700
From:	David Rees <drees76@...il.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Nick Piggin <npiggin@...e.de>,
	Jens Axboe <jens.axboe@...cle.com>,
	Jesper Krogh <jesper@...gh.cc>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Tue, Mar 24, 2009 at 5:05 PM, Arjan van de Ven <arjan@...radead.org> wrote:
> On Tue, 24 Mar 2009 16:03:53 -0700
> Jesse Barnes <jbarnes@...tuousgeek.org> wrote:
>> I remember early in the 2.6.x days there was a lot of focus on making
>> interactive performance good, and for a long time it was.  But this
>> I/O problem has been around for a *long* time now... What happened?
>> Do not many people run into this daily?  Do all the filesystem
>> hackers run with special mount options to mitigate the problem?
>
> the people that care use my kernel patch on ext3 ;-)
> (or the userland equivalent tweak in /etc/rc.local)

There's a couple of comments in bug 12309 [1] which confirm that
increasing the priority of kjournald reduces latency significantly
since I posted your tweak there yesterday.  I hope to do some testing
today on my systems to see if it helps on them, too.

-Dave

[1] http://bugzilla.kernel.org/show_bug.cgi?id=12309
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