From: Avi Kivity <avi@qumranet.com>
To: Anthony Liguori <anthony@codemonkey.ws>
Cc: Haydn Solomon <haydn.solomon@gmail.com>, kvm@vger.kernel.org
Subject: Re: KVM power usage - high wakeup rates
Date: Sun, 22 Jun 2008 09:53:21 +0300 [thread overview]
Message-ID: <485DF6E1.4060507@qumranet.com> (raw)
In-Reply-To: <485AA6A7.2060806@codemonkey.ws>
Anthony Liguori wrote:
>
> With the default options, my idle winxp guest causes about 550
> wakeups/sec which is pretty close to what I'd expect. I don't think
> you'll get much better than that without using a dynticks guest.
We keep various timers firing even if the irq lines they are tied into
are masked. This generates extra interrupts, and in the case of busy
guests, extra exits (though the cost is relatively low in that case).
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
next prev parent reply other threads:[~2008-06-22 6:53 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-19 5:29 KVM power usage - high wakeup rates Haydn Solomon
2008-06-19 18:26 ` Marcelo Tosatti
2008-06-19 18:58 ` Haydn Solomon
2008-06-19 18:34 ` Anthony Liguori
2008-06-19 18:59 ` Haydn Solomon
2008-06-19 20:17 ` Anthony Liguori
2008-06-22 6:53 ` Avi Kivity [this message]
2008-06-22 13:55 ` Anders
2008-06-23 2:51 ` Avi Kivity
2008-06-23 17:10 ` Anders
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