linux-kernel - Re: lots of APIC_TMICT exit on VM with assigned NIC

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Date:	Thu, 12 Jul 2012 11:50:51 +0300
From:	Avi Kivity <avi@...hat.com>
To:	sheng qiu <herbert1984106@...il.com>
CC:	kvm <kvm@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: lots of APIC_TMICT exit on VM with assigned NIC

On 07/12/2012 02:54 AM, sheng qiu wrote:
> Hi all,
> 
> i saw lots of APIC_TMICT exits while running a linux guest with
> assigned NIC. The APIC_TMICT exits is only a little fewer than the
> number of injected interrupts while handling network traffic on the
> assigned NIC.
> The network traffic was generated by running netperf on another
> machine targeted at the VM.
> 
> Is this normal? if not, what kind of problem may cause it?

I'm guessing the driver sets a timer on every interrupt.

What is the value written?  If it's large, perhaps we can set some slack
on the timer so it's not re-set every time.


-- 
error compiling committee.c: too many arguments to function


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