netdev - Re: [RFC] New driver API to speed up small packets xmits

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Message-Id: <E1Hq2kM-0000ID-00@gondolin.me.apana.org.au>
Date:	Mon, 21 May 2007 17:56:02 +1000
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	davem@...emloft.net (David Miller)
Cc:	xma@...ibm.com, rdreier@...co.com, ak@...e.de, krkumar2@...ibm.com,
	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: [RFC] New driver API to speed up small packets xmits

David Miller <davem@...emloft.net> wrote:
> From: Shirley Ma <xma@...ibm.com>
> Date: Tue, 15 May 2007 14:22:57 -0700
> 
>>       I just wonder without TSO support in HW, how much benefit we
>> can get by pushing GSO from interface layer to device layer besides
>> we can do multiple packets in IPoIB.
> 
> I bet the gain is non-trivial.

Yep, for any NIC that supports SG but not TSO then software GSO will
be a big win.  When the NIC doesn't support SG then the win is mostly
offset by the need to copy the packet again.

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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