linux-kernel - Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for vbus

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Date:	Wed, 19 Aug 2009 17:33:39 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Gregory Haskins <gregory.haskins@...il.com>
Cc:	Avi Kivity <avi@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Ingo Molnar <mingo@...e.hu>,
	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	alacrityvm-devel@...ts.sourceforge.net,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH v3 3/6] vbus: add a "vbus-proxy" bus model for
	vbus_driver objects

On Wed, Aug 19, 2009 at 01:36:14AM -0400, Gregory Haskins wrote:
> Please post results when you have numbers, as I had to
> give up my 10GE rig in the lab.
> I suspect you will have performance
> issues until you at least address GSO, but you may already be there by now.

Yes, measuring streaming bandwidth probably does not make sense yet, as
I do not have GSO, and I do not have VM exit mitigation. But RSN.

Meanwhile udp_rr does not need any of these, so I checked that and numbers look
like what you'd expect.  My systems seem slower than yours, but the
virtualization overhead is same: around 20us (sometimes it's a bit higher, up
to 25us).

host to host:

[root@...tlab18 netperf-2.4.5]# ~mst/netperf-2.4.5/bin/netperf -H 20.1.50.1 -t
+udp_rr
UDP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 20.1.50.1
+(20.1.50.1) port 0 AF_INET
Local /Remote
Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate
bytes  Bytes  bytes    bytes   secs.    per sec

262144 262144 1        1       10.00    13890.41
124928 124928

host to guest:

[root@...tlab18 linux-2.6]# ~mst/netperf-2.4.5/bin/netperf -H 20.1.50.3 -t udp_rr
UDP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 20.1.50.3
+(20.1.50.3) port 0 AF_INET
Local /Remote
Socket Size   Request  Resp.   Elapsed  Trans.
Send   Recv   Size     Size    Time     Rate
bytes  Bytes  bytes    bytes   secs.    per sec

262144 262144 1        1       10.00    10884.78
124928 124928


-- 
MST
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