Re: [Qemu-devel] [RFC][PATCH] Add HPET emulation to qemu (v2)

[Paul Brook]

> I've been playing with CONFIG_NO_HZ and been surprised by the
> results.  I was trying to reproduce the wakeup every 10ms that
> Samuel Thibault mentioned, thinking the HPET would improve it.
> But for an idle guest in both cases (with and without HPET), the
> number of wakeups per second was relatively low (28). Ultimately
> this depends on exactly what the guest is doing

Linux can use the existing acpi PM timer a NO_HZ clocksource.

Paul