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Date:	Thu, 28 Apr 2011 17:44:39 -0500
From:	James Bottomley <>
To:	Jan Kara <>
Cc:	Colin Ian King <>,
	Chris Mason <>,
	linux-fsdevel <>,
	linux-mm <>,
	linux-kernel <>,
	linux-ext4 <>,
Subject: Re: [BUG] fatal hang untarring 90GB file, possibly writeback

On Fri, 2011-04-29 at 00:40 +0200, Jan Kara wrote:
> James in the meantime identified that cgroups are somehow involved.
> Are you
> using systemd by any chance? Maybe cgroup IO throttling screws us?

Yes, this is a FC15 system with systemd as the default.

See related post: it looks like disabling the memory controller is what
makes this go away.


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