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

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Date:	Thu, 23 Aug 2007 18:25:03 -0400
From:	jamal <hadi@...erus.ca>
To:	David Miller <davem@...emloft.net>
Cc:	rick.jones2@...com, krkumar2@...ibm.com, gaagaan@...il.com,
	general@...ts.openfabrics.org, herbert@...dor.apana.org.au,
	jagana@...ibm.com, jeff@...zik.org, johnpol@....mipt.ru,
	kaber@...sh.net, mcarlson@...adcom.com, mchan@...adcom.com,
	netdev@...r.kernel.org, peter.p.waskiewicz.jr@...el.com,
	rdreier@...co.com, Robert.Olsson@...a.slu.se,
	shemminger@...ux-foundation.org, sri@...ibm.com, tgraf@...g.ch,
	xma@...ibm.com
Subject: Re: [PATCH 0/9 Rev3] Implement batching skb API and support in
	IPoIB

On Thu, 2007-23-08 at 18:04 -0400, jamal wrote:

> The litmus test is the same as any change that is supposed to improve
> net performance - it has to demonstrate it is not intrusive and that it
> improves (consistently) performance. The standard metrics are
> {throughput, cpu-utilization, latency} i.e as long as one improves and
> others remain zero, it would make sense. Yes, i am religious for
> batching after all the invested sweat (and i continue to work on it
> hoping to demystify) - the theory makes a lot of sense.

Before someone jumps and strangles me ;-> By "litmus test" i meant as
applied to batching. [TSO already passed - iirc, it has been
demostranted to really not add much to throughput (cant improve much
over closeness to wire speed) but improve CPU utilization].

cheers,
jamal


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