From: Avi Kivity <avi@redhat.com>
To: Erik Rull <webmaster@rdsoftware.de>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: Interrupt Assignment on host
Date: Sun, 01 Nov 2009 17:41:59 +0200 [thread overview]
Message-ID: <4AEDAC47.8000908@redhat.com> (raw)
In-Reply-To: <4AE8B499.7030201@rdsoftware.de>
On 10/28/2009 11:16 PM, Erik Rull wrote:
> Hi all,
>
> after several tests it seems that the interrupt assignment on the host
> systems influences the kvm performance drastically. If eth0, video and
> usb
> are on seperate interrupts the perfomance is way better than if they are
> shared (that means on the same one).
>
> Normally this should not matter. But why is it within kvm? Does kvm
> somehow
> hook up into the interrupt service routines?
No.
> My guest is Windows XP SP3.
Can you describe how performance suffers?
Please provide vmstat (for host int/sec) and "kvm_stat -l -f
'exits|irq_exits'" output.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2009-11-01 15:42 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-10-28 21:16 Interrupt Assignment on host Erik Rull
2009-11-01 15:41 ` Avi Kivity [this message]
2009-11-05 19:09 ` Erik Rull
2009-11-08 8:50 ` Avi Kivity
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