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: <alpine.LFD.0.98.0704280928530.9964@woody.linux-foundation.org>
Date:	Sat, 28 Apr 2007 09:30:06 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matthias Andree <matthias.andree@....de>
cc:	Andrew Morton <akpm@...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, Matthias Andree wrote:
> 
> 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...

Now *this* is actually really really nasty.

There are worse examples. Try connecting some flash disk over USB-1, and 
untar to it. Ugh.

I'd love to have some per-device dirty limit, but it's harder than it 
should be.

		Linus
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