Eric Dumazet dbca9b2750 [NET]: change layout of ehash table ... ehash table layout is currently this one : First half of this table is used by sockets not in TIME_WAIT state Second half of it is used by sockets in TIME_WAIT state. This is non optimal because of for a given hash or socket, the two chain heads are located in separate cache lines. Moreover the locks of the second half are never used. If instead of this halving, we use two list heads in inet_ehash_bucket instead of only one, we probably can avoid one cache miss, and reduce ram usage, particularly if sizeof(rwlock_t) is big (various CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_LOCK_ALLOC settings). So we still halves the table but we keep together related chains to speedup lookups and socket state change. In this patch I did not try to align struct inet_ehash_bucket, but a future patch could try to make this structure have a convenient size (a power of two or a multiple of L1_CACHE_SIZE). I guess rwlock will just vanish as soon as RCU is plugged into ehash :) , so maybe we dont need to scratch our heads to align the bucket... Note : In case struct inet_ehash_bucket is not a power of two, we could probably change alloc_large_system_hash() (in case it use __get_free_pages()) to free the unused space. It currently allocates a big zone, but the last quarter of it could be freed. Again, this should be a temporary 'problem'. Patch tested on ipv4 tcp only, but should be OK for IPV6 and DCCP. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2007-02-08 14:16:46 -08:00
..
bluetooth	[PATCH] hci endianness annotations	2006-12-13 09:05:52 -08:00
irda	[PATCH] tty: switch to ktermios and new framework	2006-12-08 08:28:56 -08:00
iucv	[S390]: Add AF_IUCV socket support	2007-02-08 13:51:54 -08:00
netfilter	[NETFILTER]: NAT: optional source port randomization support	2007-02-08 12:39:17 -08:00
sctp	[SCTP]: Correctly handle unexpected INIT-ACK chunk.	2007-01-23 20:25:46 -08:00
tc_act	[PKT_SCHED]: Kill pkt_act.h inlining.	2006-09-22 14:55:10 -07:00
tipc	[TIPC]: endianness annotations	2006-12-02 21:21:08 -08:00
act_api.h	[PKT_SCHED]: Kill pkt_act.h inlining.	2006-09-22 14:55:10 -07:00
addrconf.h	[IPV6]: Misc endianness annotations.	2006-12-02 21:22:52 -08:00
af_unix.h	[AF_UNIX]: Kernel memory leak fix for af_unix datagram getpeersec patch	2006-08-02 14:12:06 -07:00
ah.h	[IPSEC]: Use HMAC template and hash interface	2006-09-21 11:46:18 +10:00
arp.h	[IPV6]: Assorted trivial endianness annotations.	2006-12-02 21:22:50 -08:00
atmclip.h	[ATM]: Annotations.	2006-12-02 21:22:55 -08:00
ax25.h	[AX.25]: Fix unchecked ax25_linkfail_register uses	2006-12-17 21:59:11 -08:00
checksum.h	[NET]: Make mangling a checksum (0 -> 0xffff on the wire) explicit.	2006-12-02 21:23:39 -08:00
cipso_ipv4.h	NetLabel: use the correct CIPSOv4 MLS label limits	2006-12-02 21:24:12 -08:00
compat.h	Merge git://git.infradead.org/hdrcleanup-2.6	2006-06-20 15:10:08 -07:00
datalink.h	[NET]: Kill skb->real_dev	2005-08-29 15:32:25 -07:00
dn.h	[NET]: Reduce sizeof(struct flowi) by 20 bytes.	2006-10-21 20:24:01 -07:00
dn_dev.h	[DECnet]: Endian annotation and fixes for DECnet.	2006-03-20 22:42:39 -08:00
dn_fib.h	[DECNET]: cleanups	2006-09-22 14:54:40 -07:00
dn_neigh.h	[DECnet]: Endian annotation and fixes for DECnet.	2006-03-20 22:42:39 -08:00
dn_nsp.h	[DECnet]: Endian annotation and fixes for DECnet.	2006-03-20 22:42:39 -08:00
dn_route.h	[DECnet]: Endian annotation and fixes for DECnet.	2006-03-20 22:42:39 -08:00
dsfield.h	[NET]: IP header modifier helpers annotations.	2006-12-02 21:23:40 -08:00
dst.h	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
esp.h	[IPSEC] esp: Defer output IV initialization to first use.	2006-09-22 15:17:35 -07:00
fib_rules.h	[NETLINK]: Do precise netlink message allocations where possible	2006-12-02 21:22:11 -08:00
flow.h	[NET]: Rethink mark field in struct flowi	2006-12-02 21:21:39 -08:00
gen_stats.h
genetlink.h	[GENETLINK]: Add cmd dump completion.	2006-12-02 21:32:09 -08:00
icmp.h	[IPV4]: icmp_send() annotation	2006-09-28 18:01:06 -07:00
ieee80211.h	[PATCH] ieee80211: WLAN_GET_SEQ_SEQ fix (select correct region)	2007-01-02 20:56:26 -05:00
ieee80211_crypt.h	[PATCH] ieee80211: Add TKIP crypt->build_iv	2006-01-27 17:08:07 -05:00
ieee80211_radiotap.h	[PATCH] ieee80211: Added ieee80211_radiotap.h	2005-09-21 23:03:55 -04:00
ieee80211softmac.h	WorkStruct: make allyesconfig	2006-11-22 14:57:56 +00:00
ieee80211softmac_wx.h	[PATCH] softmac: add SIOCSIWMLME	2006-04-24 16:15:58 -04:00
if_inet6.h	[IPV6]: Per-interface statistics support.	2006-12-02 21:22:08 -08:00
inet6_connection_sock.h	[TCP]: Restore SKB socket owner setting in tcp_transmit_skb().	2007-01-26 01:04:55 -08:00
inet6_hashtables.h	[IPV6]: annotate inet6_hashtables	2006-12-02 21:21:10 -08:00
inet_common.h	[NET]: move struct proto_ops to const	2006-01-03 13:11:15 -08:00
inet_connection_sock.h	[TCP]: Restore SKB socket owner setting in tcp_transmit_skb().	2007-01-26 01:04:55 -08:00
inet_ecn.h	[NET]: IP header modifier helpers annotations.	2006-12-02 21:23:40 -08:00
inet_hashtables.h	[NET]: change layout of ehash table	2007-02-08 14:16:46 -08:00
inet_sock.h	[IPV4]: annotate inet_lookup() and friends	2006-09-28 18:02:26 -07:00
inet_timewait_sock.h	WorkStruct: Pass the work_struct pointer instead of context data	2006-11-22 14:55:48 +00:00
inetpeer.h	[IPV4] inet_peer: Group together avl_left, avl_right, v4daddr to speedup lookups on some CPUS	2006-10-20 00:28:35 -07:00
ip.h	[TCP]: Restore SKB socket owner setting in tcp_transmit_skb().	2007-01-26 01:04:55 -08:00
ip6_checksum.h	[IPV6]: Dumb typo in generic csum_ipv6_magic()	2006-12-22 11:12:07 -08:00
ip6_fib.h	[IPV6]: Make fib6_node subtree depend on IPV6_SUBTREES	2006-12-13 16:48:31 -08:00
ip6_route.h	[IPV6]: Misc endianness annotations.	2006-12-02 21:22:52 -08:00
ip6_tunnel.h
ip_fib.h	[IPV4] nl_fib_lookup: Rename fl_fwmark to fl_mark	2006-12-02 21:21:40 -08:00
ip_mp_alg.h	[NET]: Rethink mark field in struct flowi	2006-12-02 21:21:39 -08:00
ip_vs.h	[NET]: ipvs checksum annotations.	2006-12-02 21:23:41 -08:00
ipcomp.h	[CRYPTO] users: Use crypto_comp and crypto_has_*	2006-09-21 11:46:22 +10:00
ipconfig.h	[NET]: ipconfig and nfsroot annotations	2006-12-02 21:21:09 -08:00
ipip.h	[IPV6] net/ipv6/sit.c: make 2 functions static	2006-12-02 21:26:15 -08:00
ipv6.h	[IPV6]: __ipv6_addr_diff() annotations and cleanup.	2006-12-02 21:22:53 -08:00
ipx.h	[IPX]: Annotate and fix IPX checksum	2006-11-05 14:11:25 -08:00
iw_handler.h	[PATCH] WE-20 for kernel 2.6.16	2006-03-23 07:12:57 -05:00
lapb.h
llc.h	[LLC]: llc_mac_hdr_init const arguments	2006-03-20 22:59:36 -08:00
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h	[PATCH] gfp flags annotations - part 1	2005-10-08 15:00:57 -07:00
llc_if.h	[LLC]: add multicast support for datagrams	2006-06-17 21:26:08 -07:00
llc_pdu.h	[LLC]: anotations	2006-12-02 21:21:23 -08:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h	[LLC]: Fix the accept path	2005-09-22 07:57:21 -03:00
mip6.h	[IPV6] MIP6: Add receiving mobility header functions through raw socket.	2006-09-22 15:07:01 -07:00
ndisc.h	[IPV6]: Misc endianness annotations.	2006-12-02 21:22:52 -08:00
neighbour.h	[NET]: Convert hh_lock to seqlock.	2006-12-08 17:19:20 -08:00
netdma.h	Remove all inclusions of <linux/config.h>	2006-10-04 03:38:54 -04:00
netevent.h	[NET]: Network Event Notifier Mechanism.	2006-08-02 13:38:20 -07:00
netlabel.h	NetLabel: convert to an extensibile/sparse category bitmap	2006-12-02 21:31:36 -08:00
netlink.h	[PATCH] severing skbuff.h -> mm.h	2006-12-04 02:00:34 -05:00
netrom.h	[NETROM]: Eleminate HZ from NET/ROM kernel interfaces	2006-05-03 23:27:47 -07:00
nexthop.h	[IPv4]: FIB configuration using struct fib_config	2006-09-22 14:55:04 -07:00
p8022.h	[NET]: Fix sparse warnings	2005-08-29 16:01:32 -07:00
pkt_cls.h	[NET]: Remove explicit initializations of skb->input_dev	2005-08-29 15:33:26 -07:00
pkt_sched.h	[PKT_SCHED]: Fix regression in PSCHED_TADD{,2}.	2006-07-24 12:44:23 -07:00
protocol.h	[INET]: Change protocol field in struct inet_protosw to u16	2006-12-02 21:30:55 -08:00
psnap.h	[NET]: Kill skb->real_dev	2005-08-29 15:32:25 -07:00
raw.h	Merge git://git.infradead.org/hdrcleanup-2.6	2006-06-20 15:10:08 -07:00
rawv6.h	[IPV6]: 'info' argument of ipv6 ->err_handler() is net-endian	2006-12-02 21:21:12 -08:00
red.h	[PKT_SCHED] RED: Fix overflow in calculation of queue average	2006-08-04 22:59:51 -07:00
request_sock.h	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
rose.h	[AX.25]: Fix unchecked rose_add_loopback_neigh uses	2006-12-17 21:59:14 -08:00
route.h	[IPV4/IPV6]: Always wait for IPSEC SA resolution in socket contexts.	2007-02-08 12:38:45 -08:00
sch_generic.h	[NET_SCHED]: Fix endless loops caused by inaccurate qlen counters (part 1)	2006-12-02 21:31:42 -08:00
scm.h	[AF_UNIX]: Kernel memory leak fix for af_unix datagram getpeersec patch	2006-08-02 14:12:06 -07:00
slhc_vj.h
snmp.h	[SCTP]: Extend /proc/net/sctp/snmp to provide more statistics.	2006-09-22 14:55:16 -07:00
sock.h	[PATCH] lockdep: annotate nfs/nfsd in-kernel sockets	2006-12-07 08:39:30 -08:00
syncppp.h	[PATCH] drivers/net/wan/: possible cleanups	2005-09-14 08:36:54 -04:00
tcp.h	[TCP]: remove tcp header from tcp_v4_check (take #2)	2007-02-08 12:38:44 -08:00
tcp_ecn.h	[IPV6]: Added GSO support for TCPv6	2006-06-30 14:12:10 -07:00
tcp_states.h	[TCP]: Move the TCPF_ enum to tcp_states.h	2006-01-03 13:10:57 -08:00
timewait_sock.h	[PATCH] slab: remove kmem_cache_t	2006-12-07 08:39:25 -08:00
transp_v6.h	[NET]: Supporting UDP-Lite (RFC 3828) in Linux	2006-12-02 21:22:46 -08:00
udp.h	[PATCH] severing skbuff.h -> poll.h	2006-12-04 02:00:31 -05:00
udplite.h	[NET]: Fix assorted misannotations (from md5 and udplite merges).	2006-12-02 21:27:16 -08:00
x25.h	[X.25]: Adds /proc/sys/net/x25/x25_forward to control forwarding.	2007-02-08 13:34:36 -08:00
x25device.h	[X25]: Restore skb->dev setting in x25_type_trans().	2006-04-09 22:37:18 -07:00
xfrm.h	[XFRM]: Extension for dynamic update of endpoint address(es)	2007-02-08 13:11:42 -08:00