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Date:	Thu, 28 Apr 2011 10:57:42 -0500
From:	James Bottomley <>
To:	Colin Ian King <>
Cc:	Chris Mason <>,
	linux-fsdevel <>,
	linux-mm <>,
	linux-kernel <>,
	linux-ext4 <>
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback

On Wed, 2011-04-27 at 19:25 +0100, Colin Ian King wrote:
> Just like to add that I've seen almost identical issues with 2.6.38
> copying large amounts of data to an ext4 filesystem with systems with
> small amounts of memory.
> I found that increasing /sys/fs/ext4/sdaX/max_writeback_mb_bump worked
> around the issue.

With the PREEMPT kernel, values of 256 and 512 don't prevent kswapd
spinning up to 99% and staying there.


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