linux-kernel - Re: Memset very slow

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Message-ID: <C97064F0.479C8%brian@visionpro.com>
Date:	Thu, 03 Feb 2011 13:58:08 -0800
From:	"Brian D. McGrew" <brian@...ionpro.com>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
CC:	<linux-kernel@...r.kernel.org>
Subject: Re: Memset very slow

On 2/3/11 1:31 PM, "Alan Cox" <alan@...rguk.ukuu.org.uk> wrote:

>> So, my question is, can someone explain to me what is going on here?  I am
>> not convinced this is a kernel problem just because a new kernel fixed it;
>> but, if there were changes related to this in the kernel, then what is the
>> oldest version I should be looking at to fix my issues?
> 
> The newer kernel does several things that may be relevant - the obvious
> one is that it rewrites and corrects MTRR data if it doesn't like what
> the BIOS handed out. That would fit with dramatic slowdowns in memory
> performance being fixed.

The Dell precsion-linux mailing list almost immediately pointed me here:
https://bugzilla.redhat.com/show_bug.cgi?id=581933

Which seems like it is my problem and the fix seems to work for me.

-brian

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