linux-kernel - Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}

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Message-ID: <alpine.LSU.2.00.0904280936220.21875@fbirervta.pbzchgretzou.qr>
Date:	Tue, 28 Apr 2009 09:42:09 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
cc:	Stephen Hemminger <shemminger@...tta.com>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>,
	Jarek Poplawski <jarkao2@...il.com>,
	Paul Mackerras <paulus@...ba.org>, paulmck@...ux.vnet.ibm.com,
	Evgeniy Polyakov <zbr@...emap.net>, kaber@...sh.net,
	jeff.chua.linux@...il.com, laijs@...fujitsu.com, r000n@...0n.net,
	linux-kernel@...r.kernel.org, netfilter-devel@...r.kernel.org,
	netdev@...r.kernel.org, benh@...nel.crashing.org
Subject: Re: [PATCH] netfilter: use per-CPU r**ursive lock {XV}


On Monday 2009-04-27 21:46, Linus Torvalds wrote:

>Clue bat #3 [sic #4]:
>
> - if you do not understand the difference between these two things, don't 
>   then try to claim that somebody _else_ who does understand it is 
>   "deluding himself".
>
>   Analogy time: Ethernet and a modem line can both get you on the
>   internet. Now, let's say that Mr Peter Paste-Eater has heard of 
>   ethernet, and knows you can get on the internet with an ethernet 
>   connection, but he happens to use a modem line to do it.
>
>   Now, Peter Paste-Eater talks to you, and tells you he is connecting to 
>   the internet with ethernet, and proudly shows you his serial line and 
>   modem, and tells you how he uses ethernet to get onto the internet. You 
>   correct him, and tell him it's not ethernet.  He argues for several 
>   days about how he gets on the internet, and that it must thus be 
>   ethernet, and that you're obviously just "deluding yourself".
>
>Now, can you see why people react badly to you talking about "recursive 
>locks"? You're acting like Peter Paste-Eater calling his serial line 
>ethernet.

It could be worse. He could be running Ethernet over serial, e.g. L2TP.
Or his serial line is a TP cable with RJ45 plugs - consumers like
to call that Ethernet (cable) too.
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