netdev - Re: [PATCH] netfilter: finer grained nf

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Message-ID: <alpine.LSU.2.00.0904061430160.1189@fbirervta.pbzchgretzou.qr>
Date:	Mon, 6 Apr 2009 14:32:54 +0200 (CEST)
From:	Jan Engelhardt <jengelh@...ozas.de>
To:	Patrick McHardy <kaber@...sh.net>
cc:	Stephen Hemminger <shemminger@...tta.com>,
	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>,
	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org,
	netfilter-devel@...r.kernel.org
Subject: Re: [PATCH] netfilter: finer grained nf_conn locking


On Monday 2009-04-06 14:07, Patrick McHardy wrote:
>>>
>>> if LOCKDEP is on, size of a spinlock is 64 bytes on x86_64.
>>> Adding a spinlock on each nf_conn would be too expensive. In this
>>> case, an array of spinlock is a good compromise, as done in
>>> IP route cache, tcp ehash, ...
>>
>> IMO having different locking based on lockdep and architecture is an
>> invitation
>> to future obscure problems. Perhaps some other locking method or shrinking
>> ct entry would be better.
>
> I agree. Do people enable lockdep on production machines?

They do not.[1]


[1] http://git.opensuse.org/?p=people/jblunck/kernel-source.git;a=blob;f=config/x86_64/default;hb=SL111_BRANCH
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