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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Date:	Fri, 27 Apr 2007 12:50:34 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andreas Dilger <adilger@...sterfs.com>
cc:	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)

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.

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).

There was even somebody who did something like that for a PhD thesis, I 
forget the details (and it apparently died when the thesis was presumably 
accepted ;).

			Linus
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