netdev - Re: [PATCH v2 nf-next] netfilter: conntrack: remove the central spinlock

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Message-ID: <1369246816.2143.84.camel@joe-AO722>
Date:	Wed, 22 May 2013 11:20:16 -0700
From:	Joe Perches <joe@...ches.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Pablo Neira Ayuso <pablo@...filter.org>,
	netfilter-devel@...r.kernel.org, netdev <netdev@...r.kernel.org>,
	Tom Herbert <therbert@...gle.com>,
	Patrick McHardy <kaber@...sh.net>
Subject: Re: [PATCH v2 nf-next] netfilter: conntrack: remove the central
 spinlock

On Wed, 2013-05-22 at 10:47 -0700, Eric Dumazet wrote:
> From: Eric Dumazet <edumazet@...gle.com>
> 
> nf_conntrack_lock is a monolithic lock and suffers from huge contention
> on current generation servers (8 or more core/threads).
[]
> diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
[]
> @@ -76,7 +76,8 @@ struct nf_conn {
>             plus 1 for any connection(s) we are `master' for */
>  	struct nf_conntrack ct_general;
>  
> -	spinlock_t lock;
> +	spinlock_t	lock;
> +	u16		cpu;

trivia:

What's the real value in not using int here?


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