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David S. Miller 7adc3830f9 [TCP]: Improve ipv4 established hash function. 
If all of the entropy is in the local and foreign addresses,
but xor'ing together would cancel out that entropy, the
current hash performs poorly.

Suggested by Cosmin Ratiu:

	Basically, the situation is as follows: There is a client
	machine and a server machine. Both create 15000 virtual
	interfaces, open up a socket for each pair of interfaces and
	do SIP traffic. By profiling I noticed that there is a lot of
	time spent walking the established hash chains with this
	particular setup.

	The addresses were distributed like this: client interfaces
	were 198.18.0.1/16 with increments of 1 and server interfaces
	were 198.18.128.1/16 with increments of 1. As I said, there
	were 15000 interfaces. Source and destination ports were 5060
	for each connection.  So in this case, ports don't matter for
	hashing purposes, and the bits from the address pairs used
	cancel each other, meaning there are no differences in the
	whole lot of pairs, so they all end up in the same hash chain.

Signed-off-by: David S. Miller <davem@davemloft.net>
2008-03-04 14:28:41 -08:00
..
9p 9p: add support for sticky bit 2008-02-06 19:25:06 -06:00
bluetooth [NET]: Remove FASTCALL macro 2008-01-28 14:57:23 -08:00
irda [IrDA]: Irport removal - part 1 2008-01-28 15:08:10 -08:00
iucv [AF_IUCV]: postpone receival of iucv-packets 2007-10-10 16:54:51 -07:00
netfilter [NETFILTER]: nf_conntrack: fix ct_extend ->move operation 2008-02-07 17:56:34 -08:00
netns [NETFILTER]: arp_tables: per-netns arp_tables FILTER 2008-01-31 19:27:41 -08:00
sctp [SCTP]: Update AUTH structures to match declarations in draft-16. 2008-02-28 16:45:04 -05:00
tc_act [PKT_SCHED]: Add stateless NAT 2007-10-10 16:53:11 -07:00
tipc [TIPC]: Kill unused static inline (x5) 2008-02-07 18:17:13 -08:00
act_api.h [NET_SCHED]: act_api: use PTR_ERR in tcf_action_init/tcf_action_get 2008-01-28 15:11:17 -08:00
addrconf.h [IPV4]: Enable use of 240/4 address space. 2008-01-28 15:08:44 -08:00
af_rxrpc.h
af_unix.h [AF_UNIX]: Remove unused declaration of sysctl_unix_max_dgram_qlen. 2008-01-28 14:57:13 -08:00
ah.h [IPSEC]: Get rid of ipv6_{auth,esp,comp}_hdr 2007-10-10 16:55:55 -07:00
arp.h [NETFILTER]: ebtables: remove casts, use consts 2008-01-31 19:27:33 -08:00
atmclip.h
ax25.h [AX25] ax25_ds_timer: use mod_timer instead of add_timer 2008-02-12 17:53:34 -08:00
ax88796.h ax88796: add 93cx6 eeprom support 2007-10-10 16:53:56 -07:00
cfg80211.h cfg80211/nl80211: implement station attribute retrieval 2008-01-28 14:59:52 -08:00
checksum.h [NET]: Move netfilter checksum helpers to net/core/utils.c 2008-01-28 14:55:14 -08:00
cipso_ipv4.h
compat.h
datalink.h
dn_dev.h
dn_fib.h
dn_neigh.h
dn_nsp.h
dn_route.h [NET]: Wrap netdevice hardware header creation. 2007-10-10 16:52:50 -07:00
dn.h
dsfield.h [NET]: Constify include/net/dsfield.h 2008-01-28 14:55:58 -08:00
dst.h [DST]: shrinks sizeof(struct rtable) by 64 bytes on x86_64 2008-01-28 15:10:41 -08:00
esp.h [IPSEC]: Use crypto_aead and authenc in ESP 2008-01-31 19:27:02 -08:00
fib_rules.h [NETNS]: Process FIB rule action in the context of the namespace. 2008-01-28 15:08:14 -08:00
flow.h [IPV4]: Remove unused multipath cached routing defintion in net/flow.h 2008-01-28 15:00:20 -08:00
gen_stats.h [NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink API 2008-01-28 15:11:10 -08:00
genetlink.h
icmp.h [IPV4]: Add ICMPMsgStats MIB (RFC 4293) 2007-10-10 16:51:28 -07:00
ieee80211_crypt.h
ieee80211_radiotap.h [MAC80211]: Add get_unaligned to ieee80211_get_radiotap_len 2007-10-10 16:47:40 -07:00
ieee80211.h ieee80211: fix misannotations 2008-01-28 15:08:48 -08:00
ieee80211softmac_wx.h
ieee80211softmac.h [IEEE80211]: Fix softmac lockdep reports. 2007-10-10 16:52:22 -07:00
if_inet6.h [IPV6]: Reorg struct ifmcaddr6 to save some bytes 2008-02-03 04:28:54 -08:00
inet6_connection_sock.h
inet6_hashtables.h [SOCK] proto: Add hashinfo member to struct proto 2008-02-03 04:28:52 -08:00
inet_common.h [INET]: Remove leftover prototypes from include/net/inet_common.h 2007-11-12 21:02:51 -08:00
inet_connection_sock.h [SOCK] proto: Add hashinfo member to struct proto 2008-02-03 04:28:52 -08:00
inet_ecn.h [INET]: Give outer DSCP directly to ip*_copy_dscp 2008-01-28 14:53:45 -08:00
inet_frag.h [NETNS][FRAGS]: Make the pernet subsystem for fragments. 2008-01-28 15:10:40 -08:00
inet_hashtables.h [INET]: Fix accidentally broken inet(6)_hash_connect's port offset calculations. 2008-02-05 03:14:44 -08:00
inet_sock.h [TCP]: Improve ipv4 established hash function. 2008-03-04 14:28:41 -08:00
inet_timewait_sock.h [INET_TIMEWAIT_SOCK]: Reorganize struct inet_timewait_sock to save some bytes 2008-02-03 04:28:54 -08:00
inetpeer.h [INET]: Use list_head-s in inetpeer.c 2007-11-12 21:27:28 -08:00
ip6_checksum.h
ip6_fib.h [IPV6] Minor cleanup: remove unused definitions in net/ip6_fib.h 2008-02-07 18:11:49 -08:00
ip6_route.h [IPV6] Minor clenup: remove two unused definitions in net/ip6_route.h 2008-02-07 18:10:19 -08:00
ip6_tunnel.h [IP_TUNNEL]: Don't limit the number of tunnels with generic name explicitly. 2008-02-23 20:19:20 -08:00
ip_fib.h [IPV4]: Fix compile error building without CONFIG_FS_PROC 2008-02-05 02:54:16 -08:00
ip_vs.h [IPVS]: Switch to using ctl_paths. 2008-01-28 15:01:08 -08:00
ip.h [NETNS][FRAGS]: Make the mem counter per-namespace. 2008-01-28 15:10:36 -08:00
ipcomp.h [IPSEC]: Get rid of ipv6_{auth,esp,comp}_hdr 2007-10-10 16:55:55 -07:00
ipconfig.h
ipip.h [IPV4]: Add ip_local_out 2008-01-28 14:53:47 -08:00
ipv6.h [IPV6]: Fix sysctl compilation error. 2008-02-05 02:57:59 -08:00
ipx.h
iw_handler.h [NL80211]: add netlink interface to cfg80211 2007-10-10 16:52:14 -07:00
lapb.h
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h [NET]: Make socket creation namespace safe. 2007-10-10 16:49:07 -07:00
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h
mac80211.h mac80211: add unified BSS configuration 2008-01-28 15:09:43 -08:00
mip6.h
ndisc.h [IPV6]: remove unused method declaration (net/ndisc.h). 2008-02-12 22:06:53 -08:00
neighbour.h [ARP]: neigh_parms_put(destroy) are essentially local to core/neighbour.c. 2008-01-28 15:02:11 -08:00
net_namespace.h [NETFILTER]: x_tables: per-netns xt_tables 2008-01-31 19:27:35 -08:00
netdma.h
netevent.h [NET]: Remove unnecessary inclusion of dst.h 2008-01-28 14:53:38 -08:00
netlabel.h NetLabel: introduce a new kernel configuration API for NetLabel 2008-02-05 09:44:20 -08:00
netlink.h [NETLINK]: Add nla_append() 2008-01-28 15:11:09 -08:00
netrom.h
nexthop.h
p8022.h
pkt_cls.h [NET_SCHED]: Constify struct tcf_ext_map 2008-01-31 19:28:34 -08:00
pkt_sched.h [NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink API 2008-01-28 15:11:10 -08:00
protocol.h [IPV6]: make inet6_register_protosw to return an error code 2008-01-28 14:57:12 -08:00
psnap.h
raw.h [RAW]: Wrong content of the /proc/net/raw6. 2008-01-31 19:27:26 -08:00
rawv6.h [IPv6] RAW: Compact the API for the kernel 2008-01-28 14:54:29 -08:00
red.h
request_sock.h [INET]: Fix potential kfree on vmalloc-ed area of request_sock_queue 2007-11-15 02:57:06 -08:00
rose.h [ROSE]: Fix rose.ko oops on unload 2007-10-07 23:44:17 -07:00
route.h [IPV4] route cache: Introduce rt_genid for smooth cache invalidation 2008-01-31 19:28:27 -08:00
rtnetlink.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
sch_generic.h [NET_SCHED]: Convert classifiers from rtnetlink to new netlink API 2008-01-28 15:11:11 -08:00
scm.h pid namespaces: changes to show virtual ids to user 2007-10-19 11:53:40 -07:00
slhc_vj.h
snmp.h [XFRM]: Define packet dropping statistics. 2008-01-28 14:59:38 -08:00
sock.h net: fix kernel-doc warnings in header files 2008-02-18 20:52:13 -08:00
syncppp.h
tcp_states.h
tcp.h [TCP]: Uninline tcp_is_cwnd_limited 2008-01-28 15:01:48 -08:00
timewait_sock.h
transp_v6.h [IPV6]: make the protocol initialization to return an error code 2008-01-28 14:57:13 -08:00
udp.h [NET]: prot_inuse cleanups and optimizations 2008-01-28 15:00:36 -08:00
udplite.h [UDP]: Restore missing inDatagrams increments 2008-01-28 14:56:33 -08:00
wext.h [NET]: Make the device list and device lookups per namespace. 2007-10-10 16:49:10 -07:00
wireless.h
x25.h
x25device.h
xfrm.h [IPSEC]: Fix bogus usage of u64 on input sequence number 2008-02-12 22:50:35 -08:00