netdev - Re: [PATCH nf-next-2.6] netfilter: add xt

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]

Message-ID: <4C497644.7050201@trash.net>
Date:	Fri, 23 Jul 2010 13:00:20 +0200
From:	Patrick McHardy <kaber@...sh.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	Jan Engelhardt <jengelh@...ozas.de>,
	Netfilter Development Mailinglist 
	<netfilter-devel@...r.kernel.org>, netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH nf-next-2.6] netfilter: add xt_cpu match

Am 22.07.2010 17:18, schrieb Eric Dumazet:
> [PATCH nf-next-2.6] netfilter: add xt_cpu match
> 
> In some situations a CPU match permits a better spreading of
> connections, or select targets only for a given cpu.
> 
> With Remote Packet Steering or multiqueue NIC and appropriate IRQ
> affinities, we can distribute trafic on available cpus, per session.
> (all RX packets for a given flow is handled by a given cpu)
> 
> Some legacy applications being not SMP friendly, one way to scale a
> server is to run multiple copies of them.
> 
> Instead of randomly choosing an instance, we can use the cpu number as a
> key so that softirq handler for a whole instance is running on a single
> cpu, maximizing cache effects in TCP/UDP stacks.
> 
> Using NAT for example, a four ways machine might run four copies of
> server application, using a separate listening port for each instance,
> but still presenting an unique external port :
> 
> iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 0 \
>         -j REDIRECT --to-port 8080
> 
> iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 1 \
>         -j REDIRECT --to-port 8081
> 
> iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 2 \
>         -j REDIRECT --to-port 8082
> 
> iptables -t nat -A PREROUTING -p tcp --dport 80 -m cpu --cpu 3 \
>         -j REDIRECT --to-port 8083
> 

Applied, thanks Eric.
--
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