From: Marcelo Tosatti <mtosatti@redhat.com>
To: Haydn Solomon <haydn.solomon@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: KVM power usage - high wakeup rates
Date: Thu, 19 Jun 2008 15:26:28 -0300 [thread overview]
Message-ID: <20080619182628.GA10387@dmt.cnet> (raw)
In-Reply-To: <b75785ba0806182229x314211cavbfdf591bd33c0837@mail.gmail.com>
On Thu, Jun 19, 2008 at 01:29:39AM -0400, Haydn Solomon wrote:
> Hi List,
>
> When testing power usage of a windows xp guest using powertop utility,
> I'm noticing high wakeup rates. The following is the output of
> powertop for an idle windows xp guest.
>
>
> ==============================
> ===========================
> Wakeups-from-idle per second : 2716.6 interval: 10.0s
> no ACPI power usage estimate available
>
> Top causes for wakeups:
> 52.4% (2434.4) qemu-system-x86 : sys_timer_settime (posix_timer_fn)
> 21.5% (996.7) qemu-system-x86 : __kvm_migrate_pit_timer (pit_timer_fn)
> 15.0% (697.4) <interrupt> : extra timer interrupt
> 4.9% (227.6) <kernel IPI> : Rescheduling interrupts
> 1.6% ( 72.9) USB device 6-2 : Optical USB Mouse (Logitech)
> 1.3% ( 61.7) <interrupt> : nvidia
> 1.3% ( 59.0) <interrupt> : uhci_hcd:usb4, uhci_hcd:usb6, HDA Intel
> ===================================================================
>
> I'm getting similar values when running a Fedora 9 guest.
What difference do you see when closing the VNC client ?
next prev parent reply other threads:[~2008-06-19 18:26 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 [this message]
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
2008-06-22 13:55 ` Anders
2008-06-23 2:51 ` Avi Kivity
2008-06-23 17:10 ` Anders
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