netdev - Re: [PATCH NEXT 0/2] qlcnic: Add Qlogic 1/10Gb Ethernet driver for CNA devices

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Message-Id: <20100105.163343.14826539.davem@davemloft.net>
Date:	Tue, 05 Jan 2010 16:33:43 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	dhananjay.phadke@...gic.com
Cc:	shemminger@...tta.com, amit.salecha@...gic.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH NEXT 0/2] qlcnic: Add Qlogic 1/10Gb Ethernet driver for
 CNA devices

From: Dhananjay Phadke <dhananjay.phadke@...gic.com>
Date: Tue, 5 Jan 2010 15:55:10 -0800

> The LRO you are talking about was still kernel based
> LRO. Even GRO doesn't save PCIe transactions as much
> HW LRO does. That is the key. The difference between
> HW LRO and GRO is significant to keep former alive
> for a while.

But HW LRO is not bridge/forwarding/etc. agnostic because it loses
information.

As soon as I turn on forwarding to make a NAT box or whatever, all of
the hw LRO gets turned off and we're back to square one for local
connections on the machine.
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