From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad@kernel.org>
Subject: Re: 4.1.2 very slow without upstream patches,
 but fast with them, also 4.2 very slow
Date: Thu, 4 Oct 2012 10:25:38 -0400
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To: Peter Maloney <peter.maloney@brockmann-consult.de>
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On Wed, Oct 03, 2012 at 10:05:24PM +0200, Peter Maloney wrote:
> I also tested:
> modprobe xen-acpi-processor

You didn't say what kind of CPU you have. Nor if you compiled
your kernel or if you used a distros' kernel.

One thing (just to eliminate this being a power management issue),
is to do this on the Linux command line:

xen-acpi-processor.off=1

It would also help if you provided the .config you are using. There
are some options you should not have one (like XEN_DEBUGFS.. something).