From e8648a1fdb54da1f683784b36a17aa65ea56e931 Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Fri, 23 Jul 2010 12:59:36 +0200 Subject: 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 Signed-off-by: Eric Dumazet Signed-off-by: Patrick McHardy --- include/linux/netfilter/Kbuild | 3 ++- include/linux/netfilter/xt_cpu.h | 11 +++++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) create mode 100644 include/linux/netfilter/xt_cpu.h (limited to 'include') diff --git a/include/linux/netfilter/Kbuild b/include/linux/netfilter/Kbuild index 0cb62c85718..edeeabdc150 100644 --- a/include/linux/netfilter/Kbuild +++ b/include/linux/netfilter/Kbuild @@ -20,12 +20,13 @@ header-y += xt_TCPMSS.h header-y += xt_TCPOPTSTRIP.h header-y += xt_TEE.h header-y += xt_TPROXY.h +header-y += xt_cluster.h header-y += xt_comment.h header-y += xt_connbytes.h header-y += xt_connlimit.h header-y += xt_connmark.h header-y += xt_conntrack.h -header-y += xt_cluster.h +header-y += xt_cpu.h header-y += xt_dccp.h header-y += xt_dscp.h header-y += xt_esp.h diff --git a/include/linux/netfilter/xt_cpu.h b/include/linux/netfilter/xt_cpu.h new file mode 100644 index 00000000000..93c7f11d8f4 --- /dev/null +++ b/include/linux/netfilter/xt_cpu.h @@ -0,0 +1,11 @@ +#ifndef _XT_CPU_H +#define _XT_CPU_H + +#include + +struct xt_cpu_info { + __u32 cpu; + __u32 invert; +}; + +#endif /*_XT_CPU_H*/ -- cgit v1.2.3-18-g5258