Re: [Xen-devel] emulated tsc and frequency info

[Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>]

On 07/20/2010 12:00 PM, Keir Fraser wrote:
> On 20/07/2010 10:20, "Juergen Gross"<juergen.gross@xxxxxxxxxxxxxx>  wrote:
>
> > with xen 4.0 and xen-unstable I see weird tsc information in my HVM-domain
> > with PV-driver, if xen chooses to emulate tsc (d->arch.vtsc is set):
correction: only xen 4.0 is affected!
xen-unstable does the scaling correctly.

> > In the shared info page the tsc_to_system_mul is still reflecting the host
> > cpu frequency instead of the emulated 1 GHz.
> >
> > The reason is quite simple: tsc_set_info() is never called with a gtsc_khz
> > value other than 0. I wonder which solution is the correct one:
> > - if tsc_set_info() is called with gtsc_khz=0, assume 1 GHz (my favorite).
> That sounds best to me. Cc'ing Dan as he may have an opinion.
>
>   -- Keir
>
>
>
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--
Juergen Gross                 Principal Developer Operating Systems
TSP ES&S SWE OS6                       Telephone: +49 (0) 89 3222 2967
Fujitsu Technology Solutions              e-mail: juergen.gross@xxxxxxxxxxxxxx
Domagkstr. 28                           Internet: ts.fujitsu.com
D-80807 Muenchen                 Company details: ts.fujitsu.com/imprint.html

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