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.
