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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: |
Mon, 26 Aug 2013 14:49:41 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
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.
- [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 <=
- 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, 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