linux-kernel - Re: Possible sandybridge livelock issue

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Message-ID: <m21v02zch9.fsf@firstfloor.org>
Date:	Fri, 13 May 2011 11:23:14 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <cl@...ux.com>
Cc:	James Bottomley <James.Bottomley@...senPartnership.com>,
	x86@...nel.org, linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Mel Gorman <mgorman@...e.de>
Subject: Re: Possible sandybridge livelock issue

Christoph Lameter <cl@...ux.com> writes:

> On Fri, 13 May 2011, Andi Kleen wrote:
>
>> Turbo mode just makes the CPU faster, but it should not change
>> the scheduler decisions.
>
> I also have similar issues with Sandybridge on Ubuntu 11.04 and kernels
> 2.6.38 as well as 2.6.39 (standard ubuntu kernel configs).

It still doesn't make a lot of sense to blame the CPU for this.
This is just not the level how CPU problems would likely appear.

Can you figure out better what the kswapd is doing?

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only
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