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

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Date:	Wed, 10 Oct 2007 15:53:22 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	billfink@...dspring.com
Cc:	hadi@...erus.ca, shemminger@...ux-foundation.org,
	andi@...stfloor.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: Bill Fink <billfink@...dspring.com>
Date: Wed, 10 Oct 2007 12:02:15 -0400

> On Tue, 09 Oct 2007, David Miller wrote:
> 
> > We have to keep in mind, however, that the sw queue right now is 1000
> > packets.  I heavily discourage any driver author to try and use any
> > single TX queue of that size.  Which means that just dropping on back
> > pressure might not work so well.
> > 
> > Or it might be perfect and signal TCP to backoff, who knows! :-)
> 
> I can't remember the details anymore, but for 10-GigE, I have encountered
> cases where I was able to significantly increase TCP performance by
> increasing the txqueuelen to 10000, which is the setting I now use for
> any 10-GigE testing.

For some reason this does not surprise me.

We bumped the ethernet default up to 1000 for gigabit.
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