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[Xen-users] Q: NUMA and XEN

from [Ulrich Windl]

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Subject:	[Xen-users] Q: NUMA and XEN
From:	"Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>
Date:	Mon, 09 Oct 2006 08:10:18 +0200
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Hi,

I have a simple question, that's maybe an FAQ: The XEN hypervisor only reports 
one 
zonelist during boot, while a normal kernel will report two for a two-node NUMA 
machine. Now I'm wondering if I create two VMs with roughly half of the RAM 
(amount one node has), will XEN be clever or dumb when assigning RAM to those 
VMs?

XEN will be clever if it takes the RAM from one node, preferrably that where 
the 
assigned CPU is, and it will be dumb if it assigns just any RAM, causing a 
slowdown of RAM access.

Regards,
Ulrich


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