Date: Fri, 21 Mar 2008 17:52:38 +0100
From: Karsten Keil <kkeil@suse.de>
Subject: [users:00646] Re: Check Sum Offloading (CSO) for IPv6
To: users@tahi.org
Message-Id: <20080321165238.GA20039@pingi.kke.suse.de>
In-Reply-To: <D8D2AEA3575B364DAC5F27D00A5E0D1701E83973@PA-EXCH03.vmware.com>
References: <47E17E9E.9080607@alcatel-lucent.com> <D8D2AEA3575B364DAC5F27D00A5E0D1701E83973@PA-EXCH03.vmware.com>
X-Mail-Count: 00646

On Thu, Mar 20, 2008 at 03:20:11AM -0700, Pavan Kumar Mahoorker wrote:
> Hi,
> 
> Does IPv6 support CSO Check Sum Offloading.
> If yes then why is it needed.
> 

CSO is a hardware support issue.
IPv6 checksuming is differnt from IPv4 (differnt offsets)
so hardware may support IPv4 CSO but not IPv6.
I know that newer Intel and Broadcom HW support IPv6 CSO.

Why it is needed ?
You safe computing power on your main CPU if the network
does it for you.

-- 
Karsten Keil
SuSE Labs
ISDN and VOIP development
SUSE LINUX Products GmbH, Maxfeldstr.5 90409 Nuernberg, GF: Markus Rex, HRB 16746 (AG Nuernberg)