netdev - Re: [PATCH 0/9 Rev3] Implement batching skb API and support in IPoIB

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Date:	Wed, 08 Aug 2007 03:49:00 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	krkumar2@...ibm.com
Cc:	johnpol@....mipt.ru, sri@...ibm.com,
	shemminger@...ux-foundation.org, kaber@...sh.net,
	jagana@...ibm.com, Robert.Olsson@...a.slu.se, rick.jones2@...com,
	herbert@...dor.apana.org.au, gaagaan@...il.com,
	kumarkr@...ux.ibm.com, rdreier@...co.com,
	peter.p.waskiewicz.jr@...el.com, mcarlson@...adcom.com,
	jeff@...zik.org, general@...ts.openfabrics.org, mchan@...adcom.com,
	tgraf@...g.ch, hadi@...erus.ca, netdev@...r.kernel.org,
	xma@...ibm.com
Subject: Re: [PATCH 0/9 Rev3] Implement batching skb API and support in
 IPoIB

From: Krishna Kumar <krkumar2@...ibm.com>
Date: Wed, 08 Aug 2007 15:01:14 +0530

> RESULTS: The performance improvement for TCP No Delay is in the range of -8%
> 	to 320% (with -8% being the sole negative), with many individual tests
> 	giving 50% or more improvement (I think it is to do with the hw slots
> 	getting full quicker resulting in more batching when the queue gets
> 	woken). The results for TCP is in the range of -11% to 93%, with most
> 	of the tests (8/12) giving improvements.

Not because I think it obviates your work, but rather because I'm
curious, could you test a TSO-in-hardware driver converted to
batching and see how TSO alone compares to batching for a pure
TCP workload?

I personally don't think it will help for that case at all as
TSO likely does better job of coalescing the work _and_ reducing
bus traffic as well as work in the TCP stack.

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