netdev - vhost net on 10ge with x2apic

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Date:	Tue, 29 Dec 2009 16:07:43 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Avi Kivity <avi@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	kvm@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: vhost net on 10ge with x2apic

Got hold of some 10Ge cards and did some light benchmarking of kvm networking
with and without vhost net accelerator, while enabling x2apic emulation.
I've put a summary of results here:
http://www.linux-kvm.org/page/VhostNet#Performance

Main conclusions: vhost net improves latency (a lot) and bandwidth/cpu
utilization (less).  With x2apic and a recent guest, virtio userspace
has decent bandwidth but high latency and cpu utilization.  vhost net
bandwidth can get very close to native bandwidth (95%).
We still have work to do tuning virtio guest drivers.

-- 
MST
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