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-c...

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-c... > > 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 -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|