Re: [Xen-devel] [PATCH 00/19] Virtual NUMA for PV and HVM

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 21.11.14 at 17:35, <wei.liu2@xxxxxxxxxx> wrote:
> On Fri, Nov 21, 2014 at 04:25:34PM +0000, Jan Beulich wrote:
>> >>> On 21.11.14 at 16:06, <wei.liu2@xxxxxxxxxx> wrote:
>> > vnuma_vdistances = [10, 30] # optional
>> 
>> Being optional, would the real distances be used instead? And what
> 
> Default value of [10, 20] will be used.

That's bad. Would it be very difficult to use the host values?

>> meaning does this apparently one dimensional array here have for
>> the actually two dimensional SLIT? (Read: An example with more
>> than two nodes would be useful.)
>> 
> 
> The first element of [X, Y] is local distance, the second element is
> remote distance.
> 
> For a 4 node system:
> 
>      0    1    2    3
> 0    X    Y    Y    Y 
> 1    Y    X    Y    Y
> 2    Y    Y    X    Y
> 3    Y    Y    Y    X

That may match up with how most current NUMA systems look like,
but do we really want to bake in an oversimplification like this?

Jan


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