I transfered this issue to Dexuan to have a look last week, because I'm busy on 
some MCA issue. 
Per my understanding, the refer to nr_nodes in xend python should be replaced 
by max_node_id, but I didn't look into detail of it.
I willhave a discussion with Dexuan on Monday.
--jyh
>-----Original Message-----
>From: Andre Przywara [mailto:andre.przywara@xxxxxxx]
>Sent: Friday, January 15, 2010 9:29 PM
>To: Keir Fraser
>Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; Jiang, Yunhong
>Subject: [PATCH] xend: Fix non-contiguous NUMA node assignment
>
>Hi,
>
>it seems that I missed a point in this whole addition of max_node_id. I
>see the difference in the Xen HV part, so nr_nodes got replaced with
>max_node_id in physinfo_t (and xc_physinfo_t, respectively).
>But where does this value help in xend? There is no single Python
>reference to the physinfo()'s max_node_id field, instead all functions
>use the old (but now bogus) nr_nodes variable.
>So in the attached patch I kept the xc.physinfo() returned dictionary
>with only a nr_nodes field, calculated by simply adding 1 to max_node_id
>from libxc. Empty nodes can (and will) be detected by iterating through
>the node_to_cpus and node_to_memory lists.
>Nodes without memory should not be considered during guest's memory
>allocation, but will be used for further CPU affinity setting if the
>number of VCPUs exceeds the number of cores per node.
>
>Please correct me if I am totally wrong on this, but this seems to work
>much better in my case.
>
>Regards,
>Andre.
>
>Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
>
>--
>Andre Przywara
>AMD-Operating System Research Center (OSRC), Dresden, Germany
>Tel: +49 351 448 3567 12
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>Advanced Micro Devices GmbH
>Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen
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