linux-kernel - Re: Linux 2.6.29

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Date:	Thu, 2 Apr 2009 09:29:59 -0700
From:	David Rees <drees76@...il.com>
To:	Janne Grunau <j@...nau.net>
Cc:	Lennart Sorensen <lsorense@...lub.uwaterloo.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Theodore Tso <tytso@....edu>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Thu, Apr 2, 2009 at 4:05 AM, Janne Grunau <j@...nau.net> wrote:
>> Current kernels just have too much IO latency
>> with ext3 it seems.
>
> MythTV calls fsync every few seconds on ongoing recordings to prevent
> stalls due to large cache writebacks on ext3.

Personally that is also one of my MythTV pet peeves.  A hack added to
MythTV to work around a crappy ext3 latency bug that also causes these
large files to get heavily fragmented.  That and the fact that yo have
to patch MythTV to eliminate those forced fdatasyncs - there is no
knob to turn it off if you're running MythTV on a filesystem which
doesn't suffer from ext3's data=ordered fsync stalls.

-Dave
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