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Re: [libvirt] [PATCH RFC]: Support numad



On Tue, Feb 28, 2012 at 04:40:06PM +0000, Daniel P. Berrange wrote:
> On Tue, Feb 28, 2012 at 11:33:03AM -0500, Dave Allan wrote:
> > On Tue, Feb 28, 2012 at 10:10:50PM +0800, Osier Yang wrote:
> > > numad is an user-level daemon that monitors NUMA topology and
> > > processes resource consumption to facilitate good NUMA resource
> > > alignment of applications/virtual machines to improve performance
> > > and minimize cost of remote memory latencies. It provides a
> > > pre-placement advisory interface, so significant processes can
> > > be pre-bound to nodes with sufficient available resources.
> > > 
> > > More details: http://fedoraproject.org/wiki/Features/numad
> > > 
> > > "numad -w ncpus:memory_amount" is the advisory interface numad
> > > provides currently.
> > > 
> > > This patch add the support by introducing new XML like:
> > >   <numatune>
> > >     <cpu required_cpus="4" required_memory="524288"/>
> > >   </numatune>
> > 
> > Isn't the usual case going to be the vcpus and memory in the guest?
> > IMO we should default to passing those numbers to numad if
> > required_cpus and required_memory are not provided explicitly.
> 
> Indeed, why you would want to specify anything different ? At
> first glance my reaction was just skip the XML and call numad
> internally automatically with the guest configured allocation

That seems reasonable to me.

Dave

> Daniel
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