On 07/01/20 16:57, Gregory Esnaud wrote: > > From an hypervisor (via top command) point of view our VM is > consuming 9 CPU (900%). This was reported by our platform provider. > From a VM point of view we are consuming only 2 CPU (200%), with a > top also. > > Our provider claim us to explain why we are consuming so much CPU. > But we cannot troubleshoot the infra as it's not our responsibility. > From our point of view, everything is ok. Are you using only 2 CPUs at 100%, or are you using 9 CPUs at a total of 200%? If the former, it is possible that you are using something like idle=poll, so the machine _is_ idle but still consuming 100% host CPU. This is something that you should know, however. If the latter, the host is probably doing a little bit of busy waiting to improve your performance. The provider can disable it using the kvm.halt_poll_ns=0 module parameter and there is nothing that you can do about it. But it is unlikely that it causes the utilization to jump so much. Paolo
