linux-kernel - Re: Fwd: Cpu hotplug causes stutter on AMD platform, how can I disable it?

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Date:	Mon, 25 Feb 2013 08:43:44 +0100
From:	Mike Galbraith <bitbucket@...ine.de>
To:	Mario Giammarco <mgiammarco@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Fwd: Cpu hotplug causes stutter on AMD platform, how can I
 disable it?

On Sun, 2013-02-24 at 22:59 +0100, Mario Giammarco wrote:

> I have searched on internet and I see that is a problem common to
> several AMD platforms.
> Even in Microsoft Windows several people have the same problem and
> they solved it disabling cool&quiet on bios. It seems that some amd
> cpus on power saving cut off also HT bus blocking data from pcie bus
> (!?!)
> I have tried too and infact disabling cool&quiet improves a lot the problem.
> But I would like to find a better solution, can I disable cpu hotplug?
> Have you heard of this bug before?

I haven't, but likely others have.  Hm.. if BIOS is shutting down your
CPUs, I suspect that trying to ignore that in the kernel would be the
mother of all bad ideas :)

-Mike

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