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