linux-kernel - Re: Linux 2.6.29

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Date:	Tue, 24 Mar 2009 13:41:39 -0500
From:	Eric Sandeen <sandeen@...deen.net>
To:	Mark Lord <lkml@....ca>
CC:	Theodore Tso <tytso@....edu>, Ingo Molnar <mingo@...e.hu>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arjan van de Ven <arjan@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.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>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

Mark Lord wrote:
> Theodore Tso wrote:
>> So the question is how quickly can you *dirty* 1.6GB of memory?
> ..
> 
> MythTV:   rm /some/really/huge/video/file ; sync
>           ## disk light stays on for several minutes..
> 
> Note quite the same thing, I suppose, but it does break
> the shutdown scripts of every major Linux distribution.

It is indeed a different issue.  ext3 does a fair bit of IO on a (here
60G file) delete:

http://people.redhat.com/~esandeen/rm_test/ext3_rm.png

ext4 is much better:

http://people.redhat.com/~esandeen/rm_test/ext4_rm.png

> Simple solution for MythTV is what people already do: use xfs instead.

and yes, xfs does it very quickly:

http://people.redhat.com/~esandeen/rm_test/xfs_rm.png

-Eric
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