netdev - Re: [PATCH] net: Add ndo_gso

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Date:	Tue, 07 Oct 2014 11:50:35 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:	Tom Herbert <therbert@...gle.com>, Jesse Gross <jesse@...ira.com>,
	Or Gerlitz <gerlitz.or@...il.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	David Miller <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>,
	Thomas Graf <tgraf@...g.ch>,
	Pravin Shelar <pshelar@...ira.com>,
	Andy Zhou <azhou@...ira.com>
Subject: Re: [PATCH] net: Add ndo_gso_check

On Tue, 2014-10-07 at 11:15 -0700, Alexei Starovoitov wrote:

> csum_partial() is in asm already. probably not much more can be squeezed.

Again this is wrong assumption. Its assembly and damn slow.

Take a look at commit 99f0b958b194f7d88973f1c2190d207e0a2c7e79
for details.


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