[libvirt-users] Guest's CPU frequency cannot be similar to host system

[Allence]

Well, Thanks. This does not seem to effect my performance on the Guest, Maybe future version will be support Turbo Boost.
At 2018-05-18 15:52:01, "Daniel P. Berrangé" <berrange at redhat.com> wrote:
>On Fri, May 18, 2018 at 10:08:38AM +0800, Allence wrote:
>> My resource:
>>       kernel: 4.16.8
>>       host system: Ubuntu 16.04
>>       Llbvirt : 4.2
>>       Qemu : 2.12
>>       Cpu : intel at core i7 6700
>>       guest system: windows7 professional 
>> 
>> 
>> My problem:
>>       In my host, Cpu frequency is 3800~3900 MHz(4 socket and 2 thread)
>> because i turn on “Intel Turbo Boost”. And silent frequency is 3.40 GHz.
>> Then i boot my guest, But in Guest my cpu frequency is 3408 MHz. why it's
>> not 3800 MHz?
>
>The host OS is in charge of CPU frequency scaling operation. The guest does
>not see this ability, so has to be given a fixed CPU frequency. None the
>less the guest CPUs will have their frequency changed dynamically by the
>host OS as loading requires. The guest simply cannot see when these changes
>happen.
>
>Regards,
>Daniel
>-- 
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