On Thu, Nov 21, 2013 at 03:45:28AM +0000, Zhanghaoyu (A) wrote: > Hi, all > > What's the difference of the linux guest kernel parameter idle=<poll/mwait/halt/nomwait>, especially in performance? > > Taking the performance into account, which one is best? > > In my opinion, if the number of all VMs' vcpus is far more than that of pcpus, e.g. SPECVirt test, idle=halt is better for server's total throughput, > otherwise, e.g. in some CT scenario, the number of total vcpus is not greater than that of pcpus, idle=poll is better for server's total throughput, > because of less latency and VMEXIT. Makes sense overall. > linux-3.9 and above, idle=mwait is not recommended. > > Thanks, > Zhang Haoyu Does it actually have effect? I didn't think it would. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
