On 16/05/2018 16:22, Michael S. Tsirkin wrote: >> kvm-hint-dedicated=on only sets the CPUID bit, which Linux for example >> uses that to disable pv spinlocks. "-realtime dedicated-cpus=on" only >> disables the vmexits. You can use the two independently. > > But when would you want to use the two independently? 1) For testing 2) When some of your QEMUs are too old to support kvm-hint-dedicated=on, you may still want to use -realtime dedicated-cpus=on to get better performance on the new one. Paolo
