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Date: Sat, 28 Apr 2007 02:24:33 +0530
From: Manoj Joseph <manoj.joseph@gmail.com>
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To: Linus Torvalds <torvalds@linux-foundation.org>
CC: Andreas Dilger <adilger@clusterfs.com>,
       Marat Buharov <marat.buharov@gmail.com>,
       Andrew Morton <akpm@linux-foundation.org>,
       Mike Galbraith <efault@gmx.de>, LKML <linux-kernel@vger.kernel.org>,
       Jens Axboe <jens.axboe@oracle.com>,
       "linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
       Alex Tomas <alex@clusterfs.com>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when
 FS is under heavy write load (massive starvation)
References: <1177660767.6567.41.camel@Homer.simpson.net> <20070427013350.d0d7ac38.akpm@linux-foundation.org> <698310e10704270459t7663d39dp977cf055b8db9d2a@mail.gmail.com> <alpine.LFD.0.98.0704270819500.9964@woody.linux-foundation.org> <20070427193130.GD5967@schatzie.adilger.int> <alpine.LFD.0.98.0704271246550.9964@woody.linux-foundation.org>
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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/