linux-kernel - 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: <20070428015912.6108dbd5.akpm@linux-foundation.org>
Date:	Sat, 28 Apr 2007 01:59:12 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthias Andree <matthias.andree@....de>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mike Galbraith <efault@....de>,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS
 is under heavy write load (massive starvation)

On Sat, 28 Apr 2007 10:51:48 +0200 Matthias Andree <matthias.andree@....de> wrote:

> On Fri, 27 Apr 2007, Andrew Morton wrote:
> 
> > But none of this explains a 20-minute hang, unless a *lot* of fsyncs are
> > being performed, perhaps.
> 
> Another thing that is rather unpleasant (haven't yet tried fiddling with
> the dirty limits) is UDF to DVD-RAM - try rsyncing /home to a DVD-RAM,
> that's going to leave you with tons of dirty buffers that clear slowly
> -- "watch -n 1 grep -i dirty /proc/meminfo" is boring, but elucidating...
> 

yes, a few people are attacking that from various angles at present.  It's
tricky - writeback has to juggle a lot of balls.  We'll get there.

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