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

[Anthony Liguori]

Samuel Thibault wrote:
> Beth Kon, le Sat 02 Aug 2008 06:05:14 -0500, a écrit :
>   
> > 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).
> >     
>
> I was referring to vl.c's timeout = 10; which makes the select call
> use a timeout of 10ms. That said, "/* If all cpus are halted then wait
> until the next IRQ */", so maybe that's why you get slower wakeups per
> second.  I'm still surprised because of the call to qemu_mod_timer in
> pit_irq_timer_update which should setup at least a 100Hz timer with
> linux guests (when they don't have HPET available).
>   

The patch disables that when hpet is active.

Regards,

Anthony Liguori

> Samuel
>
>
>