[libvirt-users] Resource control is not supported on this host

[Daniel P. Berrangé]

On Tue, Mar 13, 2018 at 05:13:52PM +0100, Peter Krempa wrote:
> 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.

IIUC, that only applies to the perf stuff for reporting cache usage of
a VM.

The reporter here was trying to use the cache allocation stuff for
partitioning which AFAIK hasn't changed it userspace API

Regards,
Daniel
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