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Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq
From: |
Benoît Canet |
Subject: |
Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq |
Date: |
Tue, 27 Aug 2013 15:35:33 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
> > > 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.
So maybe what is missing is a CPUID passthrough mode triggered when -cpu host
is used ?
Best regards
Benoît
- [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, 2013/08/27
- Re: [Qemu-devel] KVM guest cpu L3 cache and cpufreq,
Benoît Canet <=
- 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