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Re: [Qemu-devel] [RFC 00/13] numa: add '-numa cpu' option

From: Eduardo Habkost
Subject: Re: [Qemu-devel] [RFC 00/13] numa: add '-numa cpu' option
Date: Thu, 19 Jan 2017 08:55:27 -0200
User-agent: Mutt/1.7.1 (2016-10-04)

On Thu, Jan 19, 2017 at 09:45:11AM +0000, Daniel P. Berrange wrote:
> On Wed, Jan 18, 2017 at 06:13:16PM +0100, Igor Mammedov wrote:
> > 
> > Series introduces a new CLI option to allow mapping cpus to numa
> > nodes using public properties [socket|core|thread]-ids instead of
> > internal cpu-index and moving cpu<->node mapping from global bitmaps
> > to PCMachineState struct.
> What is the benefit of this change to apps ? Obviously libvirt uses
> the current syntax, but I'm not aware of what problems that has - why
> would libvirt want to use this new syntax instead ?

The current interface is based on a "CPU index", and the mapping
from CPU index to a specific CPU object can be non-trivial,
especially if "-device *-cpu", CPU hotplug, or more complex CPU
topologies are used.


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