netdev - Bandwidth of NIC bonding/trunking

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Date:	Fri, 31 Jul 2009 09:40:51 -0400
From:	Sumedha Gupta <2sumedha@...il.com>
To:	netdev@...r.kernel.org
Subject: Bandwidth of NIC bonding/trunking

I configured bonding/trunking on a Netgear GS724TR switch. I am using
a 4-port NIC card using Intel Corporation 82571EB ethernet controller
on machine X with all four ports connected to the switch. There are
four client machines (A, B, C, D) also connected to the switch.
iperf is running on machine X as a server and machines A, B, C, D are
running as iperf clients:
With round robin, I consistently get:
 Interval            Transfer         Bandwidth
 0.0-10.0 sec    992 MBytes    831 Mbits/sec
 0.0-10.0 sec    989 MBytes    828 Mbits/sec
 0.0-10.0 sec  1019 MBytes    854 Mbits/sec
 0.0-10.0 sec    965 MBytes    808 Mbits/sec
However with XOR, I am not getting enough bandwidth:
 0.0-10.0 sec    619 MBytes    519 Mbits/sec
 0.0-10.0 sec    398 MBytes    333 Mbits/sec
 0.0-10.0 sec    338 MBytes    283 Mbits/sec
 0.0-10.0 sec    612 MBytes    513 Mbits/sec
Similar results with transmit load balancing (tlb), 802.3ad, active
backup and broadcast:
 0.0-10.5 sec    421 MBytes    336 Mbits/sec
 0.0-10.1 sec    323 MBytes    269 Mbits/sec
 0.0-10.0 sec    301 MBytes    252 Mbits/sec
 0.0-10.0 sec    405 MBytes    339 Mbits/sec
Although, with adaptive load balancing I was constantly getting
perfect bandwidth:
 0.0-10.0 sec  1.09 GBytes    937 Mbits/sec
 0.0-10.0 sec  1.09 GBytes    937 Mbits/sec
 0.0-10.0 sec  1.09 GBytes    937 Mbits/sec
 0.0-10.0 sec  1.09 GBytes    937 Mbits/sec
I wanted to know if so much change with mode change in bonding is
expected or did I configure something wrong in the switch which is
causing xor, tlb, 802.3ad etc. to not work properly?

Thanks,
Sumedha
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