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Re: [Xen-devel] [PATCH] softtsc for PV domains

To: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>, "Xen-Devel (E-mail)" <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH] softtsc for PV domains
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Thu, 27 Aug 2009 11:28:19 +0100
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On 26/08/2009 19:00, "Dan Magenheimer" <dan.magenheimer@xxxxxxxxxx> wrote:

> Attached patch implements softtsc (TSC emulation) for userland
> code in PV domains.  It currently is tied to the existing
> "softtsc" Xen boot option (which does the same thing but for
> HVM domains).  Later it should be tied to a
> vm.cfg option, but this is sufficient for now to obtain
> performance degradation data for PV environments that
> heavily utilize rdtsc.  To record emulation frequency,
> additional output has been added to debug-key "t".

Changeset 20128 is a fixed and simplified version of this. Please take a
look and test.

 -- Keir

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