netdev - Re: [PATCH 0/10 REV5] Implement skb batching and support in IPoIB/E1000

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Date:	Sun, 16 Sep 2007 19:25:02 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hadi@...erus.ca
Cc:	krkumar2@...ibm.com, johnpol@....mipt.ru,
	herbert@...dor.apana.org.au, kaber@...sh.net,
	shemminger@...ux-foundation.org, jagana@...ibm.com,
	Robert.Olsson@...a.slu.se, rick.jones2@...com, xma@...ibm.com,
	gaagaan@...il.com, netdev@...r.kernel.org, rdreier@...co.com,
	peter.p.waskiewicz.jr@...el.com, mcarlson@...adcom.com,
	jeff@...zik.org, mchan@...adcom.com, general@...ts.openfabrics.org,
	kumarkr@...ux.ibm.com, tgraf@...g.ch, randy.dunlap@...cle.com,
	sri@...ibm.com
Subject: Re: [PATCH 0/10 REV5] Implement skb batching and support in
 IPoIB/E1000

From: jamal <hadi@...erus.ca>
Date: Sun, 16 Sep 2007 22:14:21 -0400

> I still think this work - despite my vested interest - needs more
> scrutiny from a performance perspective.

Absolutely.

There are tertiary issues I'm personally interested in, for example
how well this stuff works when we enable software GSO on a non-TSO
capable card.

In such a case the GSO segment should be split right before we hit the
driver and then all the sub-segments of the original GSO frame batched
in one shot down to the device driver.

In this way you'll get a large chunk of the benefit of TSO without
explicit hardware support for the feature.

There are several cards (some even 10GB) that will benefit immensely
from this.
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