From: Alex Bligh <alex@alex.org.uk>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: linux-kernel@vger.kernel.org, Alex Bligh <alex@alex.org.uk>
Subject: Re: Local DoS through write heavy I/O on CFQ & Deadline
Date: Fri, 12 Oct 2012 13:57:50 +0100 [thread overview]
Message-ID: <D436B65FA628E01BCB9A9318@nimrod.local> (raw)
In-Reply-To: <20121011144634.7017e270@pyramind.ukuu.org.uk>
Alan,
--On 11 October 2012 14:46:34 +0100 Alan Cox <alan@lxorguk.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@gomeisa) (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
next prev parent reply other threads:[~2012-10-12 12:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-11 12:23 Alex Bligh
2012-10-11 13:46 ` Alan Cox
2012-10-12 12:57 ` Alex Bligh [this message]
2012-10-12 13:30 ` Michal Hocko
2012-10-12 14:48 ` Alex Bligh
2012-10-12 14:58 ` Michal Hocko
2012-10-12 16:29 ` Alex Bligh
2012-10-13 13:53 ` Hillf Danton
2012-10-13 19:33 ` Alex Bligh
2012-10-14 2:43 ` Hillf Danton
2012-10-15 8:17 ` Michal Hocko
2012-10-18 21:28 ` Jan Kara
2012-10-18 22:13 ` Chris Friesen
2012-10-18 22:24 ` Jan Kara
2012-10-14 21:17 ` Dave Chinner
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