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

  • To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
  • From: "Mr. Teo En Ming (Zhang Enming)" <space.time.universe@xxxxxxxxx>
  • Date: Wed, 28 Oct 2009 01:25:50 +0800
  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Valtteri Kiviniemi <valtteri.kiviniemi@xxxxxxxxxxxx>
  • Delivery-date: Tue, 27 Oct 2009 10:26:16 -0700
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How much improvement (in terms of percentages) do you forsee?

Mr. Teo En Ming (Zhang Enming) Dip(Mechatronics) BEng(Hons)(Mechanical
Alma Maters:
(1) Singapore Polytechnic
(2) National University of Singapore
Blog URL: http://teo-en-ming-aka-zhang-enming.blogspot.com
Email: space.time.universe@xxxxxxxxx
MSN: teoenming@xxxxxxxxxxx
Mobile Phone: +65-9648-9798
Street: Bedok Reservoir Road
Republic of Singapore

On Wed, Oct 28, 2009 at 1:23 AM, Keir Fraser <keir.fraser@xxxxxxxxxxxxx> wrote:
> 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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