Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq

[Benoît Canet]

Hi,

Thanks for the answer.

> On Tue, Aug 13, 2013 at 08:17:13PM +0200, Benoît Canet wrote:
> > 
> > Hi,
> > 
> > I noticed that the l3 cache size of a guest /proc/cpuinfo is not the same as
> > the l3 cache size of the host.
> > 
> > I did not found any references to this in the qemu and KVM code.
> > 
> > Is the size of the guest L3 cache fixed in hardware ?
> > 
> No, it is hardcoded somewhere in qemu cpuid code.
> 
> > Can a patch be written to set it ?
> > 
> Yes.

Ok I'll try to do that.

> 
> > Similarly I noticed that the frequency in the guest was not reflecting the
> > frequency scaling of the host.
> > 
> Not sure what you mean here. Frequency as seen where?

The frequency seen in the host /proc/cpuinfo and the guest /proc/cpuinfo differs
when a governor kick the cpu frequency scaling: the guest still show the maximum
frequency of the cpu.

Could this value be reflected dynamically ?

Best regards

Benoît

> 
> > Could anything be done for this ? 
> > 
> > Best regards
> > 
> > Benoît
> 
> --
>                       Gleb.