netdev - Re: ixgbe patch to provide NIC's tx/rx counters via ethtool

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Date:	Wed, 23 Sep 2009 19:08:12 -0700
From:	Ben Greear <greearb@...delatech.com>
To:	Rick Jones <rick.jones2@...com>
CC:	NetDev <netdev@...r.kernel.org>
Subject: Re: ixgbe patch to provide NIC's tx/rx counters via ethtool

Rick Jones wrote:
> Ben Greear wrote:
>> When LRO is enabled, the received packet and byte counters represent the
>> LRO'd packets, not the packets/bytes on the wire. 
>
> When LRO is enabled, are all the bytes on the wire actually 
> transferred into the host?
No...the ethernet, IP and TCP headers and such are not, for packets that 
are combined into a single
large SKB.

That is why the driver counts them wrong.  The bytes are off by a few 
percentage points, but the
packet count is off by an order of magnitude.

Thanks,
Ben

-- 
Ben Greear <greearb@...delatech.com> 
Candela Technologies Inc  http://www.candelatech.com


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