Re: [Xen-devel] [PATCH v9 1/9] xen: vnuma topology and subop hypercalls

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.09.14 at 05:27, <ufimtseva@xxxxxxxxx> wrote:
> On Wed, Sep 3, 2014 at 4:28 AM, Jan Beulich <JBeulich@xxxxxxxx> wrote:
>>>>> On 03.09.14 at 02:46, <ufimtseva@xxxxxxxxx> wrote:
>>> That is true. But taking into account that there are no buses support
>>> yet added, absence of memory and buses for a vNUMA node
>>> seem to be useless. And vNUMA can mimic hardware NUMA as close as
>>> possible, but I think the degree of this is pretty much our choice.
>>> With further extension of vNUMA to include buses I think this check
>>> will naturally disappear.
>>
>> I have to admit that I struggle with the references to "buses" in your
>> reply. Could you perhaps give some context (not the least because
>> already known future extensions may call for making provisions for
>> them in the public interface)?
> 
> Sorry Jan, looks like I have missed that one.
> 
> I meant NUMA I/O when was referring to buses.
> For example from here/
> http://en.community.dell.com/cfs-file.ashx/__key/telligent-evolution-compone 
> nts-attachments/13-4491-00-00-20-26-69-46/NUMA-for-Dell-PowerEdge-12G-Servers
> .pdf
> 
> Or here NUMA I/O = PCIe :
> http://events.linuxfoundation.org/sites/events/files/eeus13_shelton.pdf 
> 
> In earlier discussions of vNUMA, numa I/O was mentioned but never
> really looked at yet from implementation point of view.

Ah, that clarifies matters. Yes, we'll certainly want to do something
in that direction, but I don't currently see this needing extension of
the proposed hypercalls.

Jan


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