netdev - Re: [RFC] kvm tools: Implement multiple VQ for virtio-net

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Message-ID: <877h31ortx.fsf@rustcorp.com.au>
Date:	Wed, 16 Nov 2011 10:34:42 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	"Michael S. Tsirkin" <mst@...hat.com>,
	Pekka Enberg <penberg@...nel.org>
Cc:	Asias He <asias.hejun@...il.com>,
	Sasha Levin <levinsasha928@...il.com>, kvm@...r.kernel.org,
	mingo@...e.hu, gorcunov@...il.com,
	Krishna Kumar <krkumar2@...ibm.com>,
	virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: [RFC] kvm tools: Implement multiple VQ for virtio-net

On Mon, 14 Nov 2011 15:05:07 +0200, "Michael S. Tsirkin" <mst@...hat.com> wrote:
> On Mon, Nov 14, 2011 at 02:25:17PM +0200, Pekka Enberg wrote:
> > On Mon, Nov 14, 2011 at 4:04 AM, Asias He <asias.hejun@...il.com> wrote:
> > > Why both the bandwidth and latency performance are dropping so dramatically
> > > with multiple VQ?
> > 
> > What's the expected benefit from multiple VQs
> 
> Heh, the original patchset didn't mention this :) It really should.
> They are supposed to speed up networking for high smp guests.

If we have one queue per guest CPU, does this allow us to run lockless?

Thanks,
Rusty.
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