libvirt users - Apr 2017 - Performance monotoring: Perf Event support

Hi everyone,

I am using libvirt 2.5.0. I'd like to enable the "perf events" to
monitoring my vm performance such as l3 cache. But it failed with "error:
argument unsupported: unable to enable host cpu perf event for cmt".
1. Could you please give some hints on how to check if my host CPU supports
cmt,mbm, is it displayed in /proc/cpuinfo?
2. Does the kernel version matters as well to support it?

Thanks,
Hui

On Mon, Apr 24, 2017 at 06:54:32PM +0200, Hui Jing
wrote:
> Hi everyone,
> 
> I am using libvirt 2.5.0. I'd like to enable the "perf
events" to
> monitoring my vm performance such as l3 cache. But it failed with
"error:
> argument unsupported: unable to enable host cpu perf event for cmt".
> 1. Could you please give some hints on how to check if my host CPU supports
> cmt,mbm, is it displayed in /proc/cpuinfo?
It would be listed by 'virsh capabilities' as 'cmt', or in
/proc/cpuinfo
as 'cqm'.

You need pretty particular CPU models too - many Intel models don't
support this even brand new ones.
> 2. Does the kernel version matters as well to support it?
Yes, but I don't recall which version


Regards,
Daniel
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