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Date: Sat, 02 Aug 2008 09:46:30 -0500
From: Anthony Liguori <anthony@codemonkey.ws>
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Subject: Re: [Qemu-devel] [RFC][PATCH] Add HPET emulation to qemu (v2)
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To: Samuel Thibault <samuel.thibault@ens-lyon.org>, qemu-devel@nongnu.org, Beth Kon <eak@us.ibm.com>, Alexander Graf <agraf@suse.de>, kvm@vger.kernel.org

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
>
>
>