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

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Message-ID: <20090402171727.GA3127@gondor.apana.org.au>
Date:	Fri, 3 Apr 2009 01:17:27 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Avi Kivity <avi@...hat.com>
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

On Fri, Apr 03, 2009 at 01:06:10AM +0800, Herbert Xu wrote:
>
> That only happens if the guest immediately does some CPU-intensive
> computation 3ms and assuming its timeslice lasts that long.
> 
> In any case, the same thing will happen right now if the host or
> some other guest on the same CPU hogs the CPU for 3ms.

Even better, look at the packet's TOS.  If it's marked for low-
latency then vmexit immediately.  Otherwise continue.

In the backend you'd just set the marker in shared memory.

Of course invert this for the host => guest direction.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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