libvirt users - Mar 2018 - Re: Resource control is not supported on this host

Libvirt release version V4.1.0
It add a element is cachetune
After we add this, We can use host-cpu-cache
But when i add it, my host get a error message:
"Resource control is not supported on this host"
Why? 
Following is my environment:
kernel :        4.1.5,
libvirt  :        4.1.0 
qemu :        2.9
host   :        lfs-7.0


my add cachetune in xml:
    <cachetune vcpus='0-3'>
      <cache id='1' level='3' type='data'
size='3' unit='MiB'/>
    </cachetune>

On 03/13/2018 09:51 AM, Allence wrote:
> Libvirt release version V4.1.0
> It add a element is cachetune
> After we add this, We can use host-cpu-cache
> But when i add it, my host get a error message:
> "Resource control is not supported on this host"
> Why? 
For Cache Allocation Technology you need support at CPU hardware level.
Currently, only less than dozen CPUs support it (all server level Xeons):

https://www.intel.com/content/www/us/en/communications/cache-monitoring-cache-allocation-technologies.html#xeoncmtcat

Michal

On Tue, Mar 13, 2018 at 15:34:00 +0100, Michal Privoznik
wrote:
> On 03/13/2018 09:51 AM, Allence wrote:
> > Libvirt release version V4.1.0
> > It add a element is cachetune
> > After we add this, We can use host-cpu-cache
> > But when i add it, my host get a error message:
> > "Resource control is not supported on this host"
> > Why? 
> 
> For Cache Allocation Technology you need support at CPU hardware level.
> Currently, only less than dozen CPUs support it (all server level Xeons):
> 
>
https://www.intel.com/content/www/us/en/communications/cache-monitoring-cache-allocation-technologies.html#xeoncmtcat
Also besides that, the feature depends on a kernel feature which was
broken upstream and deemed unusable and thus reverted. Until libvirt is
rewritten to use the new resource control interface, the feature will
not work with new kernels.