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

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Message-ID: <497F4C2F.9000804@hp.com>
Date:	Tue, 27 Jan 2009 10:02:23 -0800
From:	Rick Jones <rick.jones2@...com>
To:	Patrick McHardy <kaber@...sh.net>
CC:	Eric Dumazet <dada1@...mosbay.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"

Patrick McHardy wrote:
> 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.

I will give it a try and let folks know the results - unless told otherwise, I 
will ass-u-me I only need rerun the "full_iptables" test case.

rick jones

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