netdev - Re: under-performing bonded interfaces

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Date:	Wed, 16 Nov 2011 17:45:34 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Simon Chen <simonchennj@...il.com>
CC:	Ben Hutchings <bhutchings@...arflare.com>,
	Ben Greear <greearb@...delatech.com>, netdev@...r.kernel.org
Subject: Re: under-performing bonded interfaces

On 11/16/2011 05:38 PM, Simon Chen wrote:
> 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...

Look at the PCI addresses - they are:

0000:03:00.0
0000:03:00.1

The numbers after the "dot" are PCI function numbers, meaning that both 
*ports* of the dual-port NIC are in the same PCIe slot, in this case a 
x4 slot.

more generally, the format is:

DDDD:BB:SS.F

D == DOMAIN; B == BUS; S == SLOT; F == FUNCTION.  If domain, bus and 
slot are the same, but functions differ, the "devices" are in the same slot.

rick jones
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