linux-kernel - Performance of bonding driver

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Message-Id: <A58902EC-8913-46FC-A8FF-0F67961B8C11@ono.com>
Date:	Fri, 20 Nov 2009 16:51:47 +0100
From:	""J.A. Magallón"" <jamagallon@....com>
To:	Linux-Kernel <linux-kernel@...r.kernel.org>
Subject: Performance of bonding driver

Hi...

I have tw boxes which I linked together vi 2x gigabit interfaces and a
3Com switch. Each interface is:

02:0a.0 Ethernet controller: Intel Corporation 82541EI Gigabit Ethernet Controller
02:0b.0 Ethernet controller: Intel Corporation 82541EI Gigabit Ethernet Controller

The switch is private for them, so there is no more taffic.
One interface alone works pretty well:

[  3] local 192.168.1.208 port 37739 connected with 192.168.1.226 port 5001
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0-10.0 sec  1.00 GBytes    861 Mbits/sec

I loaded bondin driver with no parameters, and using iperf to test the connection
I get:

[  5] local 192.168.1.208 port 5001 connected with 192.168.1.226 port 40036
[ ID] Interval       Transfer     Bandwidth
[  5]  0.0-10.0 sec    812 MBytes    679 Mbits/sec

In the node which receives, two instances of iftop on slave interfaces
show that load is balanced, but none flies higher than about 300 Mb/s.

Any ideas ?
Is bonding dependent on CPU power ? Boxes are P4-HT@2.8, 3Gb of RAM.

TIA

--
J.A. Magallon <jamagallon()ono!com>     \               Software is like sex:
                                         \         It's better when it's free

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