Re: [libvirt] [PATCH] Expose resource control capabilites on cache bank

On Thursday, 6 April 2017 at 6:10 PM, Daniel P. Berrange wrote: > On Thu, Apr 06, 2017 at 12:05:54PM +0200, Martin Kletzander wrote: > > On Thu, Apr 06, 2017 at 10:51:44AM +0100, Daniel P. Berrange wrote: > > > On Thu, Apr 06, 2017 at 11:49:14AM +0200, Martin Kletzander wrote: > > > > On Thu, Apr 06, 2017 at 04:20:06PM +0800, Eli Qiao wrote: > > > > > This patch is based on Martin's cache branch. > > > > > > > > > > This patch amends the cache bank capability as follow: > > > > > > > > > > <bank id='0' level='3' type='unified' size='15360' unit='KiB' cpus='0-5'/> > > > > > <control min='768' unit='KiB' type='unified' nclos='4'/> > > > > > <bank id='1' level='3' type='unified' size='15360' unit='KiB' cpus='6-11'/> > > > > > <control min='768' unit='KiB' type='unified' nclos='4'/> > > > > > > > > > > > > > > > > > > > > > > Either the XML is malformed, or the indentation is wrong. The indentation > > > suggests you want nested XML elements, but the parent element is an empty > > > tag, so you've actually got a flat namespace here. > > > > > > > > > > > Were we exposing the number of CLoS IDs before? Was there a discussion > > > > about it? Do we want to expose them? Probably yes, I'm just wondering. > > > > > > > > > > > > > What are CLoS IDs and what are they used for ? > > > > Effectively an ID for the allocation. The hardware has a limited number > > of them, in this case 4. I can't remember whether that number is > > per-bank, but it would not make much sense otherwise. > > > > > So, if guests are requesting a private cache allocation, and cos id == 4, > then we can only run 4 guests ? > > I think yes, but it’s per bank resource (the bank here is equal to cache id), if you have 2 banks , you can create 8 guests (each has 1 bank allocation)