On Sat, May 27, 2023 at 09:16:23AM +0100, Stuart Henderson wrote: > On 2023/05/27 06:36, br...@mailbox.org wrote: > > > > > > On Sat, 27 May 2023, Mike Larkin wrote: > > > > > probably IPI traffic then. not sure what else to say. If a few % host > > > overhead > > > is too much fot you with a 16 vCPU VM, I'd suggest reducing that. > > > > > > What is your workload for a 16 vcpu openbsd VM anyway? > > > > I would like to use the OpenBSD VM as my main workstation. I also need to > > use Linux for some graphic intensive stuff, so the ideal OpenBSD on host > > with vmm for Linux is not an option unfortunately. I guess I could accept > > that CPU usage price, but of course not having to pay it would be better. > > OpenBSD doesn't do brilliantly with that many CPUs yet. Things are > getting better but I think you're likely to find many workloads are a > bit less laggy with half that.
Also a few % CPU on the host can be caused by the interrupts caused by the clocks on every CPU. It may be that we do not select a cheap clock source like TSC and the result is much more overhead on the host. -- :wq Claudio
