linux-kernel - Re: Local DoS through write heavy I/O on CFQ & Deadline

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Message-ID: <D436B65FA628E01BCB9A9318@nimrod.local>
Date:	Fri, 12 Oct 2012 13:57:50 +0100
From:	Alex Bligh <alex@...x.org.uk>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	linux-kernel@...r.kernel.org, Alex Bligh <alex@...x.org.uk>
Subject: Re: Local DoS through write heavy I/O on CFQ & Deadline

Alan,

--On 11 October 2012 14:46:34 +0100 Alan Cox <alan@...rguk.ukuu.org.uk> 
wrote:

>> We have reproduced this on multiple hardware environments, using 3.2
>> (/proc/version_signature gives "Ubuntu 3.2.0-29.46-generic 3.2.24").
>> Anecdotally we believe the situation has worsened since 3.0.
>
> I've certainly seen this on 3.0 and 3.2, but do you still see it on
> 3.5/6 ?

We've just tested this. We see exactly the same issue on 3.6.1 using
the current build of the Ubuntu Quantal kernel, which is:

Linux version 3.6.1-030601-generic (apw@...eisa) (gcc version 4.6.3 
(Ubuntu/Linaro 4.6.3-1ubuntu5) ) #201210071322 SMP Sun Oct 7 17:23:28 UTC 
2012

More details (including full logs for that kernel) at:

 https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1064521

-- 
Alex Bligh
--
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