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: <20070427201235.GA11170@gnuppy.monkey.org>
Date:	Fri, 27 Apr 2007 13:12:35 -0700
From:	Bill Huey (hui) <billh@...ppy.monkey.org>
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>,
	"Bill Huey (hui)" <billh@...ppy.monkey.org>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation)

On Fri, Apr 27, 2007 at 12:50:34PM -0700, Linus Torvalds wrote:
> 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 ;).

That sounds a whole lot like NetApp's WAFL file system and is heavily patented.

bill

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