netdev - Re: [ofa-general] Re: [PATCH 2/3][NET

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Message-ID: <20071010091644.GA9807@one.firstfloor.org>
Date:	Wed, 10 Oct 2007 11:16:44 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	David Miller <davem@...emloft.net>
Cc:	andi@...stfloor.org, hadi@...erus.ca,
	shemminger@...ux-foundation.org, jeff@...zik.org,
	johnpol@....mipt.ru, herbert@...dor.apana.org.au,
	gaagaan@...il.com, Robert.Olsson@...a.slu.se,
	netdev@...r.kernel.org, rdreier@...co.com,
	peter.p.waskiewicz.jr@...el.com, mcarlson@...adcom.com,
	jagana@...ibm.com, general@...ts.openfabrics.org,
	mchan@...adcom.com, tgraf@...g.ch, randy.dunlap@...cle.com,
	sri@...ibm.com, kaber@...sh.net
Subject: Re: [ofa-general] Re: [PATCH 2/3][NET_BATCH] net core use batching

> A 256 entry TX hw queue fills up trivially on 1GB and 10GB, but if you

With TSO really? 

> increase the size much more performance starts to go down due to L2
> cache thrashing.

Another possibility would be to consider using cache avoidance
instructions while updating the TX ring (e.g. write combining 
on x86) 

-Andi

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