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

[Jamie Lokier]

Samuel Thibault wrote:
> Beth Kon wrote some time ago:
> > But for an idle guest in both cases (with and without HPET), the
> > number of wakeups per second was relatively low (28).
> 
> Oh, btw, did you try to reduce the qemu window? (or disconnect the VNC
> client if you are using VNC)  28 might be just because of the gui refresh
> rate.  Reducing the window will lower the gui refresh rate to 2Hz.

If the guest isn't drawing anything to video memory, and there are no
GUI events (e.g. redraw requests), why does the gui keep refreshing?

It shouldn't refresh at 2Hz either, it should just stop if there's no
video activity.  You should be able to run an idle tickless guest with
no host CPU at all.

-- Jamie