[libvirt-users] QEMU cmdline for default -smp reasonable (qemuBuildSmpArgs) ?

[Jiri Denemark]

On Thu, Sep 06, 2012 at 14:03:14 -0400, sanjay wrote:
> Hi! When only the vCPU tag is specified, libvirt by default generates a
> multi-socket topology(sockets=vCPUs,cores=1,threads=1) for the qemu command
> line. Is there a specific reason behind choice of this default
> behavior? Could a default of (socket=1,cores=vCPUs,threads=1) would have
> been a better choice ?

We need to maintain backward compatibility. Changing it would mean that guest
without topology configuration would suddenly see different CPU topology and
that could confuse them or even invalidate SW licences and similar beasts. If
you want different topology, you need to explicitly specify it in the XML.

Jirka