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

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Date:	Wed, 10 Oct 2007 03:44:46 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	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

From: Andi Kleen <andi@...stfloor.org>
Date: Wed, 10 Oct 2007 12:23:31 +0200

> On Wed, Oct 10, 2007 at 02:25:50AM -0700, David Miller wrote:
> > The chip I was working with at the time (UltraSPARC-IIi) compressed
> > all the linear stores into 64-byte full cacheline transactions via
> > the store buffer.
> 
> That's a pretty old CPU. Conclusions on more modern ones might be different.

Cache matters, just scale the numbers.

> I suppose it would be an interesting experiment at least.

Absolutely.

I've always gotten very poor results when increasing the TX queue a
lot, for example with NIU the point of diminishing returns seems to
be in the range of 256-512 TX descriptor entries and this was with
1.6Ghz cpus.
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