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784544739a
linux/net/ipv4/netfilter
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Stephen Hemminger 784544739a netfilter: iptables: lock free counters 
The reader/writer lock in ip_tables is acquired in the critical path of
processing packets and is one of the reasons just loading iptables can cause
a 20% performance loss. The rwlock serves two functions:

1) it prevents changes to table state (xt_replace) while table is in use.
   This is now handled by doing rcu on the xt_table. When table is
   replaced, the new table(s) are put in and the old one table(s) are freed
   after RCU period.

2) it provides synchronization when accesing the counter values.
   This is now handled by swapping in new table_info entries for each cpu
   then summing the old values, and putting the result back onto one
   cpu.  On a busy system it may cause sampling to occur at different
   times on each cpu, but no packet/byte counts are lost in the process.

Signed-off-by: Stephen Hemminger <shemminger@vyatta.com>

Sucessfully tested on my dual quad core machine too, but iptables only (no ipv6 here)
BTW, my new "tbench 8" result is 2450 MB/s, (it was 2150 MB/s not so long ago)

Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
2009-02-20 10:35:32 +01:00
..
arp_tables.c netfilter: iptables: lock free counters 2009-02-20 10:35:32 +01:00
arpt_mangle.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
arptable_filter.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
ip_queue.c netns: Use net_eq() to compare net-namespaces for optimization. 2008-07-19 22:34:43 -07:00
ip_tables.c netfilter: iptables: lock free counters 2009-02-20 10:35:32 +01:00
ipt_addrtype.c netfilter: netns-aware ipt_addrtype 2008-11-04 14:21:48 +01:00
ipt_ah.c netfilter: xtables: move extension arguments into compound structure (2/6) 2008-10-08 11:35:18 +02:00
ipt_CLUSTERIP.c net: replace NIPQUAD() in net/ipv4/netfilter/ 2008-10-31 00:53:08 -07:00
ipt_ecn.c netfilter: xtables: move extension arguments into compound structure (2/6) 2008-10-08 11:35:18 +02:00
ipt_ECN.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
ipt_LOG.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
ipt_MASQUERADE.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
ipt_NETMAP.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
ipt_REDIRECT.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
ipt_REJECT.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
ipt_ULOG.c netfilter: xtables: move extension arguments into compound structure (5/6) 2008-10-08 11:35:19 +02:00
iptable_filter.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
iptable_mangle.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
iptable_raw.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
iptable_security.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
Kconfig netfilter: xtables: add backward-compat options 2009-02-19 11:16:03 +01:00
Makefile netfilter: Combine ipt_ttl and ip6t_hl source 2009-02-18 18:39:31 +01:00
nf_conntrack_l3proto_ipv4_compat.c cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits: net 2008-12-29 22:44:47 -08:00
nf_conntrack_l3proto_ipv4.c netfilter 01/09: remove "happy cracking" message 2009-01-12 21:18:33 -08:00
nf_conntrack_proto_icmp.c netfilter 06/09: nf_conntrack: fix ICMP/ICMPv6 timeout sysctls on big-endian 2009-01-12 21:18:35 -08:00
nf_defrag_ipv4.c netfilter: restore lost #ifdef guarding defrag exception 2008-10-14 11:56:59 -07:00
nf_nat_amanda.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_core.c netfilter: ctnetlink: remove bogus module dependency between ctnetlink and nf_nat 2008-10-14 11:58:31 -07:00
nf_nat_ftp.c [NETFILTER]: remove unneeded rcu_dereference() calls 2007-11-07 04:08:23 -08:00
nf_nat_h323.c net: replace NIPQUAD() in net/ipv4/netfilter/ 2008-10-31 00:53:08 -07:00
nf_nat_helper.c netfilter: netns nf_conntrack: pass conntrack to nf_conntrack_event_cache() not skb 2008-10-08 11:35:07 +02:00
nf_nat_irc.c net: replace NIPQUAD() in net/ipv4/netfilter/ 2008-10-31 00:53:08 -07:00
nf_nat_pptp.c netfilter: netns nat: PPTP NAT in netns 2008-10-08 11:35:11 +02:00
nf_nat_proto_common.c nf_nat: use secure_ipv4_port_ephemeral() for NAT port randomization 2008-08-18 21:32:32 -07:00
nf_nat_proto_dccp.c [NETFILTER]: nf_conntrack: const annotations in nf_conntrack_sctp, nf_nat_proto_gre 2008-04-14 11:15:54 +02:00
nf_nat_proto_gre.c [NETFILTER]: nf_conntrack: const annotations in nf_conntrack_sctp, nf_nat_proto_gre 2008-04-14 11:15:54 +02:00
nf_nat_proto_icmp.c [NETFILTER]: nf_nat: use bool type in nf_nat_proto 2008-04-14 11:15:53 +02:00
nf_nat_proto_sctp.c sctp: remove unnecessary byteshifting, calculate directly in big-endian 2008-07-18 23:07:09 -07:00
nf_nat_proto_tcp.c [NETFILTER]: nf_nat: use bool type in nf_nat_proto 2008-04-14 11:15:53 +02:00
nf_nat_proto_udp.c [NETFILTER]: nf_nat: use bool type in nf_nat_proto 2008-04-14 11:15:53 +02:00
nf_nat_proto_udplite.c [NETFILTER]: nf_nat: use bool type in nf_nat_proto 2008-04-14 11:15:53 +02:00
nf_nat_proto_unknown.c [NETFILTER]: nf_nat: use bool type in nf_nat_proto 2008-04-14 11:15:53 +02:00
nf_nat_rule.c netfilter: x_tables: remove unneeded initializations 2009-02-18 16:30:20 +01:00
nf_nat_sip.c net: replace NIPQUAD() in net/ipv4/netfilter/ 2008-10-31 00:53:08 -07:00
nf_nat_snmp_basic.c net: replace uses of __constant_{endian} 2009-02-01 00:45:17 -08:00
nf_nat_standalone.c [NETFILTER]: nf_nat: kill helper and seq_adjust hooks 2008-04-14 11:15:52 +02:00
nf_nat_tftp.c [NETFILTER]: nf_{conntrack,nat}_tftp: annotate TFTP helper with const 2008-01-31 19:28:08 -08:00