Re: [Libvir] PATCH: Improve performance on Xen

On Fri, Aug 10, 2007 at 06:39:56AM -0400, Daniel Veillard wrote: > Well if you have 100 guests, that may be slower, but in the average situation > of only a couple of guests, it could be a real speedup. The problem is that > a lot of domain may accumulate in xenstore /local/domain even if they are > not running, both implementation are likely to have completely different > behaviour based on the context. But from a cache locality perspective hitting > xenstore may scale way better under loaded machines, so it may prove faster > even on machines with hundreds of domains. Doing a fair performance comparison > may prove really hard. Actually the /local/domain/[ID] subtree is guarenteed to only contain running VMs. The /vm/[UUID] subtree is where cruft accumulates over time, so its safe to rely on info in the former, but not the latter