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RE: [Xen-devel] [PATCH 0/4] [HVM] NUMA support in HVM guests

To: "Andre Przywara" <andre.przywara@xxxxxxx>
Subject: RE: [Xen-devel] [PATCH 0/4] [HVM] NUMA support in HVM guests
From: "Xu, Anthony" <anthony.xu@xxxxxxxxx>
Date: Mon, 10 Sep 2007 09:14:27 +0800
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Thread-topic: [Xen-devel] [PATCH 0/4] [HVM] NUMA support in HVM guests

>> This always starts from node0, this may make node0 very busy, while
>nodes may not have many work.
>This is true, I encountered this before, but didn't want to wait longer
>for sending up the patches. Actually the "numanodes=n" config file
>option shouldn't specify the number of nodes, but a list of specific
>nodes to use, like "numanodes=0,2" to pin the domain on the first and
>the third node.

That's a good idea to specify the nodes to use,
We can use "numamodes=0,2" in configure file, and it will be converted
into bitmap long numamodes, every bit indicates one node.
When guest doesn't specify "numamodes", XEN will need to choose proper
nodes for guest. So XEN also needs to implement some algorithm to choose
proper nodes.

>> We also need to add some limitations for numanodes. The number of
>on vnode should not be larger
> >than the number of pcpus on pnode. Otherwise vcpus belonging to a
>domain run
> > on the same pcpu, which is not what we want.
>Would be nice, but in the moment I would push this into the sysadmin's
It's reasonable.

>After all my patches were more a discussion base than a final solution,
>so I see there is more work to do. In the moment I am working on
>including PV guests.
That's a very good start for support guest NUMA.

- Anthony

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