netdev - Re: [PATCH 00/10] Implement batching skb API

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Date:	Fri, 20 Jul 2007 16:54:23 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Krishna Kumar <krkumar2@...ibm.com>
Cc:	davem@...emloft.net, rdreier@...co.com, Robert.Olsson@...a.slu.se,
	peter.p.waskiewicz.jr@...el.com, kumarkr@...ux.ibm.com,
	herbert@...dor.apana.org.au, gaagaan@...il.com,
	mcarlson@...adcom.com, xma@...ibm.com, rick.jones2@...com,
	hadi@...erus.ca, jeff@...zik.org, general@...ts.openfabrics.org,
	mchan@...adcom.com, tgraf@...g.ch, netdev@...r.kernel.org,
	jagana@...ibm.com, kaber@...sh.net, sri@...ibm.com
Subject: Re: [PATCH 00/10] Implement batching skb API

Hi Krishna.

On Fri, Jul 20, 2007 at 12:01:49PM +0530, Krishna Kumar (krkumar2@...ibm.com) wrote:
> After fine-tuning qdisc and other changes, I modified IPoIB to use this API,
> and now get good gains. Summary for TCP & No Delay: 1 process improves for
> all cases from 1.4% to 49.5%; 4 process has almost identical improvements
> from -1.7% to 59.1%; 16 process case also improves in the range of -1.2% to
> 33.4%; while 64 process doesn't have much improvement (-3.3% to 12.4%). UDP
> was tested with 1 process netperf with small increase in BW but big
> improvement in Service Demand. Netperf latency tests show small drop in
> transaction rate (results in separate attachment).

What about round-robin tcp time and latency test? In theory such batching
mode should not change that timings, but practice can show new aspects.
I will review code later this week (likely tomorrow) and if there will
be some issues return back.

-- 
	Evgeniy Polyakov
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