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linux/net/ipv4
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Eric Dumazet f86dcc5aa8 udp: dynamically size hash tables at boot time 
UDP_HTABLE_SIZE was initialy defined to 128, which is a bit small for
several setups.

4000 active UDP sockets -> 32 sockets per chain in average. An
incoming frame has to lookup all sockets to find best match, so long
chains hurt latency.

Instead of a fixed size hash table that cant be perfect for every
needs, let UDP stack choose its table size at boot time like tcp/ip
route, using alloc_large_system_hash() helper

Add an optional boot parameter, uhash_entries=x so that an admin can
force a size between 256 and 65536 if needed, like thash_entries and
rhash_entries.

dmesg logs two new lines :
[    0.647039] UDP hash table entries: 512 (order: 0, 4096 bytes)
[    0.647099] UDP Lite hash table entries: 512 (order: 0, 4096 bytes)

Maximal size on 64bit arches would be 65536 slots, ie 1 MBytes for non
debugging spinlocks.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-10-07 22:00:22 -07:00
..
netfilter netfilter: nfnetlink: constify message attributes and headers 2009-08-25 16:07:58 +02:00
af_inet.c net: mark net_proto_ops as const 2009-10-07 01:10:46 -07:00
ah4.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
arp.c net: make neigh_ops constant 2009-09-01 17:40:57 -07:00
cipso_ipv4.c ipv4: Define cipso_v4_delopt static 2009-10-07 14:45:58 -07:00
datagram.c
devinet.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
esp4.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
fib_frontend.c ipv4: fib table algorithm performance improvement 2009-10-05 00:21:56 -07:00
fib_hash.c ipv4: fib table algorithm performance improvement 2009-10-05 00:21:56 -07:00
fib_lookup.h
fib_rules.c ipv4: fib table algorithm performance improvement 2009-10-05 00:21:56 -07:00
fib_semantics.c
fib_trie.c ipv4: fib table algorithm performance improvement 2009-10-05 00:21:56 -07:00
icmp.c icmp: No need to call sk_write_space() 2009-10-05 00:21:54 -07:00
igmp.c bonding: remap muticast addresses without using dev_close() and dev_open() 2009-09-15 02:37:40 -07:00
inet_connection_sock.c net: Add sk_mark route lookup support for IPv4 listening sockets 2009-10-07 13:55:57 -07:00
inet_diag.c
inet_fragment.c
inet_hashtables.c
inet_lro.c
inet_timewait_sock.c tcp: fix premature termination of FIN_WAIT2 time-wait sockets 2009-08-29 00:00:35 -07:00
inetpeer.c
ip_forward.c
ip_fragment.c
ip_gre.c tunnels: Optimize tx path 2009-10-05 00:21:57 -07:00
ip_input.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
ip_options.c
ip_output.c net: Use sk_mark for routing lookup in more places 2009-10-01 15:16:49 -07:00
ip_sockglue.c net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
ipcomp.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
ipconfig.c
ipip.c tunnels: Optimize tx path 2009-10-05 00:21:57 -07:00
ipmr.c add vif using local interface index instead of IP 2009-10-07 00:48:41 -07:00
Kconfig
Makefile
netfilter.c
proc.c
protocol.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
raw.c net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
route.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
syncookies.c net: Add sk_mark route lookup support for IPv4 listening sockets 2009-10-07 13:55:57 -07:00
sysctl_net_ipv4.c sysctl: remove "struct file *" argument of ->proc_handler 2009-09-24 07:21:04 -07:00
tcp_bic.c
tcp_cong.c Networking: use CAP_NET_ADMIN when deciding to call request_module 2009-08-14 11:18:34 +10:00
tcp_cubic.c
tcp_diag.c
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c tcp: fix ssthresh u16 leftover 2009-09-15 01:30:10 -07:00
tcp_ipv4.c tcp: fix ssthresh u16 leftover 2009-09-15 01:30:10 -07:00
tcp_lp.c
tcp_minisocks.c tcp: fix CONFIG_TCP_MD5SIG + CONFIG_PREEMPT timer BUG() 2009-09-15 23:49:21 -07:00
tcp_output.c IPv4 TCP fails to send window scale option when window scale is zero 2009-10-01 15:14:51 -07:00
tcp_probe.c
tcp_scalable.c
tcp_timer.c Revert Backoff [v3]: Calculate TCP's connection close threshold as a time value. 2009-09-01 02:45:47 -07:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c
tcp_yeah.c
tcp.c net: splice() from tcp to pipe should take into account O_NONBLOCK 2009-10-02 09:46:05 -07:00
tunnel4.c net: constify struct net_protocol 2009-09-14 17:03:01 -07:00
udp_impl.h net: Make setsockopt() optlen be unsigned. 2009-09-30 16:12:20 -07:00
udp.c udp: dynamically size hash tables at boot time 2009-10-07 22:00:22 -07:00
udplite.c udp: dynamically size hash tables at boot time 2009-10-07 22:00:22 -07:00
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c
xfrm4_output.c
xfrm4_policy.c xfrm4: fix build when SYSCTLs are disabled 2009-08-04 20:18:33 -07:00
xfrm4_state.c
xfrm4_tunnel.c