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

[Gleb Natapov]

On Tue, Aug 27, 2013 at 04:17:56PM +0300, Gleb Natapov wrote:
> On Tue, Aug 27, 2013 at 03:18:16PM +0200, Benoît Canet wrote:
> > 
> > Hello Eduardo,
> > 
> > I read a bit about caches on wikipedia.
> > 
> > If I understand correctly changing the CPUID L3 cache infos in QEMU will 
> > change
> > the value displayed in the guest /proc/cpuinfo but will not change the size 
> > of
> > the l3 cache used by the hardware. So I am chasing a cosmetic bug.
> > If it right ?
> > 
> Right.
> 
Well, actually not entirely. An application can query cache sizes and
adjust its algorithms accordingly in which case performance can be
suboptimal if information in a guest is not accurate.

--
                        Gleb.