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

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Date:	Tue, 09 Oct 2007 13:43:31 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	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, hadi@...erus.ca,
	mcarlson@...adcom.com, jagana@...ibm.com,
	general@...ts.openfabrics.org, mchan@...adcom.com, tgraf@...g.ch,
	randy.dunlap@...cle.com, sri@...ibm.com,
	shemminger@...ux-foundation.org, kaber@...sh.net
Subject: Re: [ofa-general] Re: [PATCH 2/3][NET_BATCH] net core use batching

From: Andi Kleen <andi@...stfloor.org>
Date: 09 Oct 2007 18:51:51 +0200

> Hopefully that new qdisc will just use the TX rings of the hardware
> directly. They are typically large enough these days. That might avoid
> some locking in this critical path.

Indeed, I also realized last night that for the default qdiscs
we do a lot of stupid useless work.  If the queue is a FIFO
and the device can take packets, we should send it directly
and not stick it into the qdisc at all.

> If the data is just passed on to the hardware queue, why is any 
> locking needed at all? (except for the driver locking of course)

Absolutely.

Our packet scheduler subsystem is great, but by default it should just
get out of the way.
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