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



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

Daniel
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