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

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Message-ID: <CAB7xdinaGFxyn3OHmsq0Lqtkfs9XST0j0Tj4kBvQGNf5UxWLvw@mail.gmail.com>
Date:	Thu, 12 Jul 2012 12:32:21 -0500
From:	sheng qiu <herbert1984106@...il.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	kvm <kvm@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: lots of APIC_TMICT exit on VM with assigned NIC

thanks for your reply.
the value is very large. 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?

Thanks,
Sheng

On Thu, Jul 12, 2012 at 3:50 AM, Avi Kivity <avi@...hat.com> wrote:
> 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
>
>



-- 
Sheng Qiu
Texas A & M University
Room 332B Wisenbaker
email: herbert1984106@...il.com
College Station, TX 77843-3259
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