netdev - Re: [PATCH 2/2] nfnetlink_queue: provide rcu enabled callbacks

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Message-ID: <4E243E80.6010509@trash.net>
Date:	Mon, 18 Jul 2011 16:09:04 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Florian Westphal <fw@...len.de>, sclark46@...thlink.net,
	Eric Leblond <eric@...it.org>,
	Kuzin Andrey <kuzinandrey@...dex.ru>,
	Anders Nilsson Plymoth <lanilsson@...il.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH 2/2] nfnetlink_queue: provide rcu enabled callbacks

On 01.07.2011 17:29, Eric Dumazet wrote:
> nenetlink_queue operations on SMP are not efficent if several queues are
> used, because of nfnl_mutex contention when applications give packet
> verdict.
> 
> Use new call_rcu field in struct nfnl_callback to advertize a callback
> that is called under rcu_read_lock instead of nfnl_mutex.
> 
> On my 2x4x2 machine, I was able to reach 2.000.000 pps going through
> user land returning NF_ACCEPT verdicts without losses, instead of less
> than 500.000 pps before patch.

Applied, nice work.
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