netdev - Re: [PATCH] net: Add ndo_gso

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Date:	Tue, 30 Sep 2014 17:18:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Tom Herbert <therbert@...gle.com>
Cc:	Stephen Hemminger <stephen@...workplumber.org>,
	Or Gerlitz <gerlitz.or@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>,
	Pravin Shelar <pshelar@...ira.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Andy Zhou <azhou@...ira.com>
Subject: Re: [PATCH] net: Add ndo_gso_check

On Tue, 2014-09-30 at 17:05 -0700, Tom Herbert wrote:

> 
> Will this still be an advantage with the burst TX implementation?

Segmenting a 64K packet into 45 sk_buff adds an additional 90
allocations (45 sk_buff, 45 sk->head) and dirtying a _lot_ of memory.

We now have some helpers that might be used by drivers to perform TSO
emulation.

commit e876f208af18b074f800656e4d1b99da75b2135f ("net: Add a software
TSO helper API")

Check commit 3ae8f4e0b98b640aadf410c21185ccb6b5b02351 for reference
("net: mv643xx_eth: Implement software TSO")



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