From: Anthony Liguori <anthony@codemonkey.ws>
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
Subject: Re: [Qemu-devel] [RFC][PATCH] Add HPET emulation to qemu (v2)
Date: Sat, 02 Aug 2008 09:46:30 -0500 [thread overview]
Message-ID: <48947346.5080605@codemonkey.ws> (raw)
In-Reply-To: <20080802113812.GD4535@implementation>
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
>
>
>
next prev parent reply other threads:[~2008-08-02 14:47 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-02 11:05 [Qemu-devel] [RFC][PATCH] Add HPET emulation to qemu (v2) Beth Kon
2008-08-02 11:38 ` Samuel Thibault
2008-08-02 14:46 ` Anthony Liguori [this message]
2008-08-02 17:21 ` Samuel Thibault
2008-08-02 17:26 ` Samuel Thibault
2008-08-12 16:33 ` Beth Kon
2008-08-02 11:42 ` Paul Brook
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