On Mon, 13 May 2019 at 19:52, Raslan, KarimAllah <karahmed@xxxxxxxxx> 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. You can have a post. Regards, Wanpeng Li
