netdev - Re: under-performing bonded interfaces

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Date:	Wed, 16 Nov 2011 20:38:08 -0500
From:	Simon Chen <simonchennj@...il.com>
To:	Ben Hutchings <bhutchings@...arflare.com>
Cc:	Ben Greear <greearb@...delatech.com>, netdev@...r.kernel.org
Subject: Re: under-performing bonded interfaces

Thanks, Ben. That's good discovery...

Are you saying that both 10G NICs are on the same PCIe x4 slot, so
that they're subject to the 12G throughput bottleneck?

I'm gonna verify this with the hardware vendor...

Thanks.
-Simon

On Wed, Nov 16, 2011 at 7:57 PM, Ben Hutchings
<bhutchings@...arflare.com> wrote:
> 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.
>
>
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