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[Xen-users] Re: Q: NUMA and XEN

Ryan is currently working on NUMA support. He can probably give a better idea of the sort of things we'll be supporting.

Regards,

Anthony Liguori

Ulrich Windl wrote:
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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