On 5/13/19 7:51 AM, Raslan, KarimAllah wrote: > On Mon, 2019-05-13 at 07:31 -0400, Konrad Rzeszutek Wilk wrote: >> On May 13, 2019 5:20:37 AM EDT, Wanpeng Li <kernellwp@xxxxxxxxx> wrote: >>> On Wed, 8 May 2019 at 02:57, Marcelo Tosatti <mtosatti@xxxxxxxxxx> >>> wrote: >>>> >>>> >>>> Certain workloads perform poorly on KVM compared to baremetal >>>> due to baremetal's ability to perform mwait on NEED_RESCHED >>>> bit of task flags (therefore skipping the IPI). >>> KVM supports expose mwait to the guest, if it can solve this? >>> >> >> There is a bit of problem with that. The host will see 100% CPU utilization even if the guest is idle and taking long naps.. >> >> Which depending on your dashboard can look like the machine is on fire. > This can also be fixed. I have a patch that kind of expose proper information > about the *real* utilization here if that would be help. Yes, that would certainly be interesting to see. Thanks. --boris
