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

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Message-ID: <20071012182724.GA12933@one.firstfloor.org>
Date:	Fri, 12 Oct 2007 20:27:24 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	"Brandeburg, Jesse" <jesse.brandeburg@...el.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	David Miller <davem@...emloft.net>, 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,
	"Waskiewicz Jr, Peter P" <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

> related to this comment, does Linux have a lockless (using atomics)
> singly linked list element?  That would be very useful in a driver hot
> path.

No; it doesn't. At least not a portable one.
Besides they tend to be not faster anyways because e.g. cmpxchg tends
to be as slow as an explicit spinlock.

-Andi

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