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Neil Horman 1080d709fb net: implement emergency route cache rebulds when gc_elasticity is exceeded 
This is a patch to provide on demand route cache rebuilding.  Currently, our
route cache is rebulid periodically regardless of need.  This introduced
unneeded periodic latency.  This patch offers a better approach.  Using code
provided by Eric Dumazet, we compute the standard deviation of the average hash
bucket chain length while running rt_check_expire.  Should any given chain
length grow to larger that average plus 4 standard deviations, we trigger an
emergency hash table rebuild for that net namespace.  This allows for the common
case in which chains are well behaved and do not grow unevenly to not incur any
latency at all, while those systems (which may be being maliciously attacked),
only rebuild when the attack is detected.  This patch take 2 other factors into
account:
1) chains with multiple entries that differ by attributes that do not affect the
hash value are only counted once, so as not to unduly bias system to rebuilding
if features like QOS are heavily used
2) if rebuilding crosses a certain threshold (which is adjustable via the added
sysctl in this patch), route caching is disabled entirely for that net
namespace, since constant rebuilding is less efficient that no caching at all

Tested successfully by me.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2008-10-27 17:06:14 -07:00
..
9p 9p: fix sparse warnings 2008-10-22 18:54:47 -05:00
bluetooth include: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
irda include: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
iucv
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netfilter netfilter: ctnetlink: remove bogus module dependency between ctnetlink and nf_nat 2008-10-14 11:58:31 -07:00
netns net: implement emergency route cache rebulds when gc_elasticity is exceeded 2008-10-27 17:06:14 -07:00
phonet Phonet: include generic link-layer header size in MAX_PHONET_HEADER 2008-10-26 23:06:31 -07:00
sctp sctp: Fix to handle SHUTDOWN in SHUTDOWN_RECEIVED state 2008-10-23 01:01:18 -07:00
tc_act pkt_action: add new action skbedit 2008-09-12 16:30:20 -07:00
tipc tipc: Remove unneeded parameter to tipc_createport_raw() 2008-07-14 22:42:19 -07:00
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 netns: Add network namespace argument to rt6_fill_node() and ipv6_dev_get_saddr() 2008-08-14 15:33:21 -07:00
af_rxrpc.h
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af_unix.h [PATCH] f_count may wrap around 2008-07-26 20:53:40 -04:00
ah.h
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arp.h [NETFILTER]: ebtables: remove casts, use consts 2008-01-31 19:27:33 -08:00
atmclip.h
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ax25.h [AX25] ax25_ds_timer: use mod_timer instead of add_timer 2008-02-12 17:53:34 -08:00
ax88796.h
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cfg80211.h cfg80211: show interface type 2008-09-24 16:18:00 -04:00
checksum.h
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cipso_ipv4.h cipso: Add support for native local labeling and fixup mapping names 2008-10-10 10:16:34 -04:00
compat.h net: Use standard structures for generic socket address structures. 2008-07-19 22:35:47 -07:00
datalink.h
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dn.h
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dn_dev.h
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dn_fib.h
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dn_neigh.h
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dn_nsp.h
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dn_route.h
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dsa.h dsa: add support for Trailer tagging format 2008-10-08 17:24:16 -07:00
dsfield.h
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dst.h net: Kill plain NET_XMIT_BYPASS. 2008-08-04 23:04:08 -07:00
esp.h [IPSEC]: Use crypto_aead and authenc in ESP 2008-01-31 19:27:02 -08:00
fib_rules.h net: add fib_rules_ops to flush_cache method 2008-07-05 19:01:28 -07:00
flow.h ipv4: Loosen source address check on IPv4 output 2008-10-01 07:28:28 -07:00
garp.h vlan: Add GVRP support 2008-07-05 21:26:57 -07:00
gen_stats.h [NET_SCHED]: Convert packet schedulers from rtnetlink to new netlink API 2008-01-28 15:11:10 -08:00
genetlink.h netlink: Improve returned error codes 2008-06-03 16:36:54 -07:00
icmp.h mib: put icmpmsg statistics on struct net 2008-07-18 04:04:22 -07:00
ieee80211.h include: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
ieee80211_crypt.h
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ieee80211_radiotap.h include: use get/put_unaligned_* helpers 2008-07-25 10:53:26 -07:00
if_inet6.h ipv6: make struct ipv6_devconf static 2008-07-22 14:21:58 -07:00
inet6_connection_sock.h
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inet6_hashtables.h inet: Don't lookup the socket if there's a socket attached to the skb 2008-10-07 12:41:01 -07:00
inet_common.h [NETNS]: Inet control socket should not hold a namespace. 2008-04-03 14:28:30 -07:00
inet_connection_sock.h net: more #ifdef CONFIG_COMPAT 2008-08-28 02:53:51 -07:00
inet_ecn.h [IPV6]: Use appropriate sock tclass setting for routing lookup. 2008-04-13 23:40:51 -07:00
inet_frag.h [NET]: Rename inet_frag.h identifiers COMPLETE, FIRST_IN, LAST_IN to INET_FRAG_* 2008-03-28 16:35:27 -07:00
inet_hashtables.h inet: Don't lookup the socket if there's a socket attached to the skb 2008-10-07 12:41:01 -07:00
inet_sock.h tcp: Port redirection support for TCP 2008-10-01 07:46:49 -07:00
inet_timewait_sock.h ipv4: Implement IP_TRANSPARENT socket option 2008-10-01 07:30:02 -07:00
inetpeer.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip.h sysctl: simplify ->strategy 2008-10-16 11:21:47 -07:00
ip6_checksum.h
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ip6_fib.h [NETNS][IPV6] rt6_info - move rt6_info structure inside the namespace 2008-03-04 13:48:30 -08:00
ip6_route.h netns: Add network namespace argument to rt6_fill_node() and ipv6_dev_get_saddr() 2008-08-14 15:33:21 -07:00
ip6_tunnel.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ip_fib.h [IPV4]: Fix compile error building without CONFIG_FS_PROC 2008-02-05 02:54:16 -08:00
ip_vs.h include: replace __FUNCTION__ with __func__ 2008-10-16 11:21:30 -07:00
ipcomp.h ipsec: ipcomp - Merge IPComp implementations 2008-07-25 02:54:40 -07:00
ipconfig.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
ipip.h inet: Make tunnel RX/TX byte counters more consistent 2008-10-09 12:03:17 -07:00
ipv6.h ipv6: making ip and icmp statistics per/namespace 2008-10-08 11:16:45 -07:00
ipx.h
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iw_handler.h wext: Emit event stream entries correctly when compat. 2008-06-16 18:50:49 -07:00
lapb.h
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llc.h [LLC]: station source mac address 2008-03-28 16:28:36 -07:00
llc_c_ac.h
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llc_c_ev.h
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llc_c_st.h
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llc_conn.h
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llc_if.h [LLC]: Kill static inline llc_addrany 2008-02-29 11:46:17 -08:00
llc_pdu.h [LLC]: skb allocation size for responses 2008-03-31 21:02:47 -07:00
llc_s_ac.h
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llc_s_ev.h
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llc_s_st.h
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llc_sap.h [LLC]: skb allocation size for responses 2008-03-31 21:02:47 -07:00
mac80211.h mac80211: fixme for kernel-doc 2008-10-14 21:12:37 -04:00
mip6.h [IPV6] MIP6: Use our standard definitions for paddings. 2008-04-12 13:43:22 +09:00
ndisc.h sysctl: simplify ->strategy 2008-10-16 11:21:47 -07:00
neighbour.h core: add stat to track unresolved discards in neighbor cache 2008-07-16 20:50:49 -07:00
net_namespace.h netfilter: netns nf_conntrack: add netns boilerplate 2008-10-08 11:35:02 +02:00
netdma.h
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netevent.h
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netlabel.h netlabel: Add configuration support for local labeling 2008-10-10 10:16:34 -04:00
netlink.h Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-10-01 06:12:56 -07:00
netrom.h
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nexthop.h
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p8022.h
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pkt_cls.h [PKT_SCHED]: Pass real namespace in net scheduler classifiers. 2008-03-27 16:53:37 -07:00
pkt_sched.h pkt_sched: Remove the tx queue state check in qdisc_run() 2008-09-23 01:05:56 -07:00
protocol.h [NETNS]: Drop packets in the non-initial namespace on the per/protocol basis. 2008-03-24 15:33:00 -07:00
psnap.h
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raw.h [RAW]: Add raw_hashinfo member on struct proto. 2008-03-22 16:56:51 -07:00
rawv6.h
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red.h
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request_sock.h tcp: Fix kernel panic when calling tcp_v(4/6)_md5_do_lookup 2008-08-06 23:50:04 -07:00
rose.h rose: improving AX25 routing frames via ROSE network 2008-06-17 17:08:32 -07:00
route.h ipv4: Conditionally enable transparent flow flag when connecting 2008-10-01 07:35:39 -07:00
rtnetlink.h [RTNL]: Introduce the rtnl_kill_links helper. 2008-04-16 00:46:52 -07:00
sch_generic.h pkt_sched: Fix handling of gso skbs on requeuing 2008-10-06 09:54:39 -07:00
scm.h
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slhc_vj.h
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snmp.h net: remove CVS keywords 2008-06-11 21:00:38 -07:00
sock.h net: wrap sk->sk_backlog_rcv() 2008-10-07 14:18:42 -07:00
stp.h net: Add STP demux layer 2008-07-05 21:25:39 -07:00
syncppp.h Remove bogus variables from syncppp.[ch] 2008-07-23 23:00:31 +02:00
tcp.h net: wrap sk->sk_backlog_rcv() 2008-10-07 14:18:42 -07:00
tcp_states.h
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timewait_sock.h
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transp_v6.h net: change proto destroy method to return void 2008-06-14 17:04:49 -07:00
udp.h netns: make uplitev6 mib per/namespace 2008-10-07 14:50:06 -07:00
udplite.h [UDP]: Revert udplite and code split. 2008-03-06 16:22:02 -08:00
wext.h wext: Dispatch and handle compat ioctls entirely in net/wireless/wext.c 2008-06-16 18:32:46 -07:00
wireless.h cfg80211: show interface type 2008-09-24 16:18:00 -04:00
x25.h
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x25device.h
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xfrm.h xfrm: MIGRATE enhancements (draft-ebalard-mext-pfkey-enhanced-migrate) 2008-10-05 13:33:42 -07:00