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Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init
From: |
David Gibson |
Subject: |
Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP |
Date: |
Fri, 20 Oct 2017 12:21:30 +1100 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
On Thu, Oct 19, 2017 at 02:23:04PM +0200, Paolo Bonzini wrote:
> On 19/10/2017 13:49, David Gibson wrote:
> > Note that describing socket/core/thread tuples as arch independent (or
> > even machine independent) is.. debatable. I mean it's flexible enough
> > that most platforms can be fit to that scheme without too much
> > straining. But, there's no arch independent way of defining what each
> > level means in terms of its properties.
> >
> > So, for example, on spapr - being paravirt - there's no real
> > distinction between cores and sockets, how you divide them up is
> > completely arbitrary.
>
> Same on x86, actually.
>
> It's _common_ that cores on the same socket share L3 cache and that a
> socket spans an integer number of NUMA nodes, but it doesn't have to be
> that way.
>
> QEMU currently enforces the former (if it tells the guest at all that
> there is an L3 cache), but not the latter.
Ok. Correct me if I'm wrong, but doesn't ACPI describe the NUMA
architecture in terms of this thread/core/socket heirarchy? That's
not true for PAPR, where the NUMA topology is described in an
independent set of (potentially arbitrarily nested) nodes.
--
David Gibson | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!
http://www.ozlabs.org/~dgibson
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- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, (continued)
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Igor Mammedov, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Igor Mammedov, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/18
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, David Gibson, 2017/10/19
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Paolo Bonzini, 2017/10/19
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP,
David Gibson <=
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/20
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Igor Mammedov, 2017/10/23
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Igor Mammedov, 2017/10/23
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/25
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/25
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/25
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Igor Mammedov, 2017/10/19
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/19
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Eduardo Habkost, 2017/10/19
- Re: [Qemu-devel] [RFC 0/6] enable numa configuration before machine_init() from HMP/QMP, Daniel P. Berrange, 2017/10/20