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Re: [Xen-devel] Latest unstable detects cpu speed incorrectly

from [Keir Fraser] [Permanent Link][Original]
To: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
Subject: Re: [Xen-devel] Latest unstable detects cpu speed incorrectly
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Tue, 27 Oct 2009 17:23:08 +0000
Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Valtteri Kiviniemi <valtteri.kiviniemi@xxxxxxxxxxxx>
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On 27/10/2009 17:20, "Mr. Teo En Ming (Zhang Enming)"
<space.time.universe@xxxxxxxxx> wrote:

> What does it mean by reverting to old behavior?
> 
> Does setting tsc_native=1 in HVM config increases the performance of domU?

Yes, since it means RDTSC instruction is directly executed in the guest,
rather than being trapped and emulated. Degree of improvement will depend on
the guest and workload.

 -- Keir



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