netdev - Re: [PATCHv9 3/3] vhost_net: a kernel-level virtio server

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Date:	Sun, 22 Nov 2009 12:35:11 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	"Xin, Xiaohui" <xiaohui.xin@...el.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"virtualization@...ts.linux-foundation.org" 
	<virtualization@...ts.linux-foundation.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"hpa@...or.com" <hpa@...or.com>,
	"gregory.haskins@...il.com" <gregory.haskins@...il.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"s.hetze@...ux-ag.com" <s.hetze@...ux-ag.com>,
	Daniel Walker <dwalker@...o99.com>,
	Eric Dumazet <eric.dumazet@...il.com>, mashirle@...ibm.com
Subject: Re: [PATCHv9 3/3] vhost_net: a kernel-level virtio server

On Wed, Nov 18, 2009 at 01:42:43PM +0800, Xin, Xiaohui wrote:
> Michael,
> >From the http://www.linux-kvm.org/page/VhostNet, we can see netperf with TCP_STREAM can get more than 4GMb/s for the receive side, and more than 5GMb/s for the send side.
> Is it the result from the raw socket or through tap?
> I want to duplicate such performance with vhost on my side. I can only get more than 1GMb/s with following conditions:
> 1) disabled the GRO feature in the host 10G NIC driver
> 2) vi->big_packet in guest is false
> 3) MTU is 1500.
> 4) raw socket, not the tap
> 5) using your vhost git tree
> 
> Is that the reasonable result with such conditions or maybe I have made some silly mistakes somewhere I don't know yet?
> May you kindly describe your test environment/conditions in detail to have much better performance in your website (I really need the performance)?
> 
> Thanks
> Xiaohui

These results where sent by Shirley Ma (Cc'd).
I think they were with tap, host-to-guest/guest-to-host

> And I have tested the tun support with vhost now, and may you share your /home/mst/ifup script here?
> 

These are usually pretty simple, mine looks like this:

#!/bin/sh -x
/sbin/ifconfig tap0 0.0.0.0 up
brctl addif br0 tap0

-- 
MST
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