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

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Message-Id: <20100105.195741.145481609.davem@davemloft.net>
Date:	Tue, 05 Jan 2010 19:57:41 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	rick.jones2@...com
Cc:	dhananjay.phadke@...gic.com, 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: Rick Jones <rick.jones2@...com>
Date: Tue, 05 Jan 2010 17:33:38 -0800

> David Miller wrote:
>> 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.
> 
> Is it really the PCIe transactions (*)?  ISTR that HW LRO also tended
> to significantly cut-down on the ACK rate, rather like the oft-derided
> ACK avoidance heuristics in Solaris, HP-UX and various MacOSX revs.

Yes, it causes stretch ACKs, but so does GRO.
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