linux-kernel - Re: [RFC PATCH 00/17] virtual-bus

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Message-ID: <49D4EDBD.3050900@redhat.com>
Date:	Thu, 02 Apr 2009 19:54:21 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
CC:	Gregory Haskins <ghaskins@...ell.com>,
	Rusty Russell <rusty@...tcorp.com.au>, anthony@...emonkey.ws,
	andi@...stfloor.org, linux-kernel@...r.kernel.org, agraf@...e.de,
	pmullaney@...ell.com, pmorreale@...ell.com, netdev@...r.kernel.org,
	kvm@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [RFC PATCH 00/17] virtual-bus

Herbert Xu wrote:
> On Thu, Apr 02, 2009 at 06:57:38PM +0300, Avi Kivity wrote:
>   
>> What if the guest sends N packets, then does some expensive computation  
>> (say the guest scheduler switches from the benchmark process to  
>> evolution).  So now we have the marker set at packet N, but the host  
>> will not see it until the guest timeslice is up?
>>     
>
> Well that's fine.  The guest will use up the remainder of its
> timeslice.  After all we only have one core/hyperthread here so
> this is no different than if the packets were held up higher up
> in the guest kernel and the guest decided to do some computation.
>
>   

3ms latency for ping?

(ping will always be scheduled immediately when the reply arrives if I 
understand cfs, so guest load won't delay it)

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.

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