On 11/28/2017 04:37 AM, Longpeng (Mike) wrote: > > On 2017/11/25 21:09, Jan H. Schönherr wrote: > >> Allow to disable pause loop exit/pause filtering on a per VM basis. >> >> If some VMs have dedicated host CPUs, they won't be negatively affected >> due to needlessly intercepted PAUSE instructions. >> > Hi Jan, > > Is there any difference between 'disable PLE in vmcs' and 'make ple_gap per > VM/VCPU and set ple_gap=0 for vcpus which is dedicated' ? "Just" disabling PLE in vmcs would still call into some of the PLE window adjustment paths and potentially do some VMCS writes at times. My patch should have eliminated these cases as well. However, making all the PLE configuration knobs per VM has the difficulty that you'd need to be able to specify them in some way. That would not only be a x86 specific interface, but a VMX specific one as well. VMX-PLE and SVM-PF don't look compatible enough for a shared configuration. That's why I only went for the binary on/off interface. Regards Jan
