Jan Beulich wrote: >>>> Andre Przywara 09.11.09 16:02 >>> >> BTW: Shouldn't we set finally numa=on as the default value? > > I'd say no, at least until the default confinement of a guest to a single > node gets fixed to properly deal with guests having more vCPU-s than > a node's worth of pCPU-s (i.e. I take it for granted that the benefits of > not overcommitting CPUs outweigh the drawbacks of cross-node memory > accesses at the very least for CPU-bound workloads). That sounds reasonable. Attached a patch to lift the restriction of one node per guest if the number of VCPUs is greater than the number of cores / node. This isn't optimal (the best way would be to inform the guest about it, but this is another patchset ;-), but should solve the above concerns. Please apply, Andre. Signed-off-by: Andre Przywara -- Andre Przywara AMD-Operating System Research Center (OSRC), Dresden, Germany Tel: +49 351 448 3567 12 ----to satisfy European Law for business letters: Advanced Micro Devices GmbH Karl-Hammerschmidt-Str. 34, 85609 Dornach b. Muenchen Geschaeftsfuehrer: Andrew Bowd; Thomas M. McCoy; Giuliano Meroni Sitz: Dornach, Gemeinde Aschheim, Landkreis Muenchen Registergericht Muenchen, HRB Nr. 43632