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From: Ben Hutchings <bhutchings@solarflare.com>
Subject: Re: under-performing bonded interfaces
Date: Thu, 17 Nov 2011 00:57:29 +0000
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Cc: Ben Greear <greearb@candelatech.com>, <netdev@vger.kernel.org>
To: Simon Chen <simonchennj@gmail.com>
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On Wed, 2011-11-16 at 19:05 -0500, Simon Chen wrote:
> If used independently, I can get around 9.8Gbps.
[...]
> [   11.572861] ixgbe 0000:03:00.0: (PCI Express:5.0Gb/s:Width x4) e8:9a:8f:23:42:1a
[...]

You need a PCIe 2.0 x8 slot to run 2 10 Gb ports at full speed.  An x4
slot is only good for about 12-13 Gb aggregate throughput (dependent on
packet sizes and other details).

Ben.

-- 
Ben Hutchings, Staff Engineer, Solarflare
Not speaking for my employer; that's the marketing department's job.
They asked us to note that Solarflare product names are trademarked.