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

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Date:	Thu, 23 Aug 2007 18:04:10 -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, kumarkr@...ux.ibm.com, 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 Wed, 2007-22-08 at 13:21 -0700, David Miller wrote:
> From: Rick Jones <rick.jones2@...com>
> Date: Wed, 22 Aug 2007 10:09:37 -0700
> 
> > Should it be any more or less worrysome than small packet
> > performance (eg the TCP_RR stuff I posted recently) being rather
> > worse with TSO enabled than with it disabled?
> 
> That, like any such thing shown by the batching changes, is a bug
> to fix.

Possibly a bug - but you really should turn off TSO if you are doing
huge interactive transactions (which is fair because there is a clear
demarcation).
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.

cheers,
jamal

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