Re: emulated tsc and frequency info

[Juergen Gross <juergen.gross@ts.fujitsu.com>]

On 07/20/2010 12:00 PM, Keir Fraser wrote:
> On 20/07/2010 10:20, "Juergen Gross"<juergen.gross@ts.fujitsu.com>  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@ts.fujitsu.com
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