* Richard W.M. Jones <rjones@redhat.com> [2007-09-28 11:20]:
beth kon wrote:
Richard W.M. Jones wrote:
My results are a bit inconclusive. I have a machine here which supposedly supports NUMA (2 socket, 2 core AMD with hypertransport and two separate banks of RAM).
BIOS is _not_ configured to interleave memory. Other BIOS settings lead me to suppose that NUMA is enabled (or at least not disabled).
Booting with Daniel's Xen & kernel does not give any messages about NUMA enabled or disabled. (See attached messages).
# numactl --show physcpubind: 0 1 2 3 No NUMA support available on this system.
Are you setting "numa=on dom0_mem=512m" on the kernel line in grub? I'm not sure if the dom0_mem=512m should be required but we were having problems when trying to boot numa without it.
Aha, the results are quite a bit better now :-)
virsh shows the correct topology:
<topology> <cells num='2'> <cell id='0'> <cpus num='2'> <cpu id='0'/> <cpu id='1'/> </cpus> </cell> <cell id='1'> <cpus num='2'> <cpu id='2'/> <cpu id='3'/> </cpus> </cell> </cells> </topology>
numactl --show still doesn't work (missing support in dom0 kernel or is this just completely incompatible with Xen?)
Currently Xen doesn't export any per-domain topology (say a virtual SRAT table), nor the entire system topology; the goal of the current Xen NUMA code is to ensure that domains have local resources within a numa-node.
'virsh freecell 0' and 'virsh freecell 1' show numbers which are plausible (I have no idea if they're actually correct though).
Can I pin a domain or vCPU to memory to see if that works?
Rich.
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