netdev - RE: [PATCH net-next 08/12] r8152: support TSO

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Message-ID: <1393945351.26794.110.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 04 Mar 2014 07:02:31 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Laight <David.Laight@...LAB.COM>
Cc:	'hayeswang' <hayeswang@...ltek.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"nic_swsd@...ltek.com" <nic_swsd@...ltek.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: RE: [PATCH net-next 08/12] r8152: support TSO

On Tue, 2014-03-04 at 14:35 +0000, David Laight wrote:

> Does that mean you are splitting the 64k 'ethernet packet' from TCP
> is software? I've looked at the ax88179 where the hardware can do it.
> 
> Is there really a gain doing segmentation here if you have to do the
> extra data copy?

There is no 'extra' copy.

There is _already_ a copy, so what's the deal of doing this copy in a SG
enabled way ?



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