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Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq
From: |
Gleb Natapov |
Subject: |
Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq |
Date: |
Tue, 27 Aug 2013 16:20:09 +0300 |
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.
- [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Benoît Canet, 2013/08/13
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Gleb Natapov, 2013/08/26
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Benoît Canet, 2013/08/26
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Gleb Natapov, 2013/08/26
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Benoît Canet, 2013/08/26
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Eduardo Habkost, 2013/08/26
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Benoît Canet, 2013/08/27
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Gleb Natapov, 2013/08/27
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq,
Gleb Natapov <=
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Benoît Canet, 2013/08/27
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Gleb Natapov, 2013/08/27
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq, Eduardo Habkost, 2013/08/27