linux-ext4 - Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation)

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Message-ID: <46326309.3050104@gmail.com>
Date:	Sat, 28 Apr 2007 02:24:33 +0530
From:	Manoj Joseph <manoj.joseph@...il.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andreas Dilger <adilger@...sterfs.com>,
	Marat Buharov <marat.buharov@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	Alex Tomas <alex@...sterfs.com>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when
 FS is under heavy write load (massive starvation)

Linus Torvalds wrote:
> 
> On Fri, 27 Apr 2007, Andreas Dilger wrote:
>> It's true that this is a "feature" of ext3 with data=ordered (the default),
>> but I suspect the same thing is now true in reiserfs too.
> 
> Oh, well.. Journalling sucks.

Go back to ext2? ;)

> I was actually _really_ hoping that somebody would come along and tell 
> everybody that this whole journal-logging is stupid, and that it's just 
> better to not ever re-write blocks on disk, but instead write to new 
> blocks with version numbers (and not re-use old blocks until new versions 
> are stable on disk).

Ah, "copy on write"! ZFS (Sun) and WAFL (NetApp) does this. Don't know 
about WAFL, but ZFS does logging too.

-Manoj

-- 
Manoj Joseph
http://kerneljunkie.blogspot.com/

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