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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html