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: <03a701c78907$70470f30$50d52d90$@com>
Date:	Fri, 27 Apr 2007 13:05:42 -0700
From:	"Hua Zhong" <hzhong@...il.com>
To:	"'Linus Torvalds'" <torvalds@...ux-foundation.org>,
	"'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>, "'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)

The idea has not died and some NAS/file server vendors have already been
doing this for some time. (I am not sure but is WAFS the same thing?)

> -----Original Message-----
> From: linux-kernel-owner@...r.kernel.org [mailto:linux-kernel-
> owner@...r.kernel.org] On Behalf Of Linus Torvalds
> Sent: Friday, April 27, 2007 12:51 PM
> To: Andreas Dilger
> Cc: Marat Buharov; Andrew Morton; Mike Galbraith; LKML; Jens Axboe;
> linux-ext4@...r.kernel.org; Alex Tomas
> 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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