netdev - under-performing bonded interfaces

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Date:	Wed, 16 Nov 2011 18:44:43 -0500
From:	Simon Chen <simonchennj@...il.com>
To:	netdev@...r.kernel.org
Subject: under-performing bonded interfaces

Hello,

I am bonding two 10G interfaces (ixgbe driver) under Debian 6.0.2. The
bonded interface for some reason can only achieve 12Gbps aggregated
throughput. If a single NIC is used, I can get close to 10Gbps.

I've tried different bonding modes (balance-xor, 802.3ad, balance-alb,
balance-tlb), and different xmit hashing policy (layer2, layer2+3,
layer3+4). I've increased all types of kernel parameters for TCP. MTU
on the physical and bonded interface is set to 8000 and 9000. The MTU
on the switch is 9200+.

Instead of nperf (a single server), I also tried my own TCP sender and
receivers.

All those done, still only 12Gbps... How can I really achieve close to 20Gbps?

(I also tried cutting loose the switch in between, and also getting
12G, so not an issue with the switch.)

Thanks.
-Simon
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