On Fri, Sep 11, 2009 at 10:36 AM, Bruce Rogers <[email protected]> wrote: > Also, when I did a simple experiment with vcpu overcommitment, I was > surprised how quickly performance suffered (just bringing a Linux vm up), > since I would have assumed the additional vcpus would have been halted the > vast majority of the time. On a 2 proc box, overcommitment to 8 vcpus in a > guest (I know this isn't a good usage scenario, but does provide some > insights) caused the boot time to increase to almost exponential levels. At > 16 vcpus, it took hours to just reach the gui login prompt.
I'd guess (and hope!) that having many 1- or 2-cpu guests won't kill performance as sharply as having a single guest with more vcpus than the physical cpus available. have you tested that? -- Javier -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
