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

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Date:	Sun, 15 Jul 2012 11:03:03 +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 08:32 PM, sheng qiu wrote:
> thanks for your reply.
> the value is very large. 

Can you provide samples?

If it's large and fairly constant it means a timer keeps being pushed
back by the interrupts/


> is there anyway that i  can avoid such
> frequent exits due to APIC_TMICT? do i need to modify some codes in
> kvm kernel module or adapt some parameters?
> 

No, a guest change is needed.  You need to find out what timer is
involved at modify it to set some slack, with
hrtimer_set_expires_range() or similar.
-- 
error compiling committee.c: too many arguments to function


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