netdev - Re: 32 core net-next stack/netfilter "scaling"

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Date:	Tue, 27 Jan 2009 18:33:51 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	Rick Jones <rick.jones2@...com>,
	Linux Network Development list <netdev@...r.kernel.org>,
	Netfilter Developers <netfilter-devel@...r.kernel.org>,
	Stephen Hemminger <shemminger@...tta.com>
Subject: Re: 32 core net-next stack/netfilter "scaling"

Eric Dumazet wrote:
> [PATCH] netfilter: Get rid of central rwlock in tcp conntracking
>
> TCP connection tracking suffers of huge contention on a global rwlock,
> used to protect tcp conntracking state.
>
> As each tcp conntrack state have no relations between each others, we
> can switch to fine grained lock. Using an array of spinlocks avoids
> enlarging size of connection tracking structures, yet giving reasonable
> fanout.
>
> tcp_print_conntrack() doesnt need to lock anything to read
> ct->proto.tcp.state, so speedup /proc/net/ip_conntrack as well.
>
> nf_conntrack_hash_rnd_initted & nf_conntrack_hash_rnd declared read_mostly
>   

This looks good to me. Rick, would you like to give it a try?

I'll convert the remaining conntrack protocols when applying it.
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