AcoSail/kernel_optimize_test
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kernel_optimize_test/net/ipv4
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Herbert Xu a7ab4b501f [TCPv4]: Improve BH latency in /proc/net/tcp 
Currently the code for /proc/net/tcp disable BH while iterating
over the entire established hash table.  Even though we call
cond_resched_softirq for each entry, we still won't process
softirq's as regularly as we would otherwise do which results
in poor performance when the system is loaded near capacity.

This anomaly comes from the 2.4 code where this was all in a
single function and the local_bh_disable might have made sense
as a small optimisation.

The cost of each local_bh_disable is so small when compared
against the increased latency in keeping it disabled over a
large but mostly empty TCP established hash table that we
should just move it to the individual read_lock/read_unlock
calls as we do in inet_diag.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
2007-07-10 22:06:20 -07:00
..
ipvs [IPVS]: Fix state variable on failure to start ipvs threads 2007-06-18 22:33:20 -07:00
netfilter [NETFILTER]: ip_tables: fix compat related crash 2007-06-07 13:40:32 -07:00
af_inet.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
ah4.c
arp.c [IPV4]: Convert IPv4 devconf to an array 2007-06-07 13:39:13 -07:00
cipso_ipv4.c [CIPSO]: Fix several unaligned kernel accesses in the CIPSO engine. 2007-06-08 13:33:10 -07:00
datagram.c [IPV4]: Fix "ipOutNoRoutes" counter error for TCP and UDP 2007-06-03 18:08:50 -07:00
devinet.c [IPV4]: Do not remove idev when addresses are cleared 2007-06-08 13:33:08 -07:00
esp4.c
fib_frontend.c [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
fib_hash.c [RTNETLINK]: Fix sending netlink message when replace route. 2007-05-24 16:36:53 -07:00
fib_lookup.h [RTNETLINK]: Fix sending netlink message when replace route. 2007-05-24 16:36:53 -07:00
fib_rules.c [NETLINK]: Mark netlink policies const 2007-06-07 13:40:10 -07:00
fib_semantics.c [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
fib_trie.c [RTNETLINK]: Fix sending netlink message when replace route. 2007-05-24 16:36:53 -07:00
icmp.c [ICMP]: Fix icmp_errors_use_inbound_ifaddr sysctl 2007-06-03 18:08:51 -07:00
igmp.c [IPV4]: Convert IPv4 devconf to an array 2007-06-07 13:39:13 -07:00
inet_connection_sock.c [TCP]: Use default 32768-61000 outgoing port range in all cases. 2007-06-03 18:08:43 -07:00
inet_diag.c
inet_hashtables.c
inet_timewait_sock.c
inetpeer.c
ip_forward.c
ip_fragment.c
ip_gre.c [IPV4] IP_GRE: Unify code path to get hash array index. 2007-04-25 22:29:56 -07:00
ip_input.c [IPV4] SNMP: Support InMcastPkts and InBcastPkts 2007-04-30 00:58:29 -07:00
ip_options.c
ip_output.c [TCP]: Honour sk_bound_dev_if in tcp_v4_send_ack 2007-06-07 13:38:51 -07:00
ip_sockglue.c
ipcomp.c
ipconfig.c [NET]: Rework dev_base via list_head (v3) 2007-05-03 15:13:45 -07:00
ipip.c [IPV4] IPIP: Unify code path to get hash array index. 2007-04-25 22:29:55 -07:00
ipmr.c [IPV4]: Restore old behaviour of default config values 2007-06-07 13:39:26 -07:00
Kconfig [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
Makefile [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
netfilter.c
proc.c [IPV4]: Convert IPv4 devconf to an array 2007-06-07 13:39:13 -07:00
protocol.c
raw.c
route.c [IPV4]: The scheduled removal of multipath cached routing support. 2007-07-10 22:05:57 -07:00
syncookies.c
sysctl_net_ipv4.c [IPV4]: Convert IPv4 devconf to an array 2007-06-07 13:39:13 -07:00
tcp_bic.c [TCP]: Set initial_ssthresh default to zero in Cubic and BIC. 2007-06-13 01:03:53 -07:00
tcp_cong.c [TCP] slow start: Make comments and code logic clearer. 2007-05-17 14:20:31 -07:00
tcp_cubic.c [TCP]: Set initial_ssthresh default to zero in Cubic and BIC. 2007-06-13 01:03:53 -07:00
tcp_diag.c
tcp_highspeed.c [TCP] Highspeed: Limited slow-start is nowadays in tcp_slow_start 2007-05-03 13:28:35 -07:00
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c [TCP]: Congestion control API RTT sampling fix 2007-06-15 15:08:43 -07:00
tcp_input.c [TCP]: Fix logic breakage due to DSACK separation 2007-06-15 15:14:04 -07:00
tcp_ipv4.c [TCPv4]: Improve BH latency in /proc/net/tcp 2007-07-10 22:06:20 -07:00
tcp_lp.c [TCP]: Congestion control API RTT sampling fix 2007-06-15 15:08:43 -07:00
tcp_minisocks.c
tcp_output.c header cleaning: don't include smp_lock.h when not used 2007-05-08 11:15:07 -07:00
tcp_probe.c [TCP] tcp_probe: Attach printf attribute properly to printl(). 2007-06-07 13:40:09 -07:00
tcp_scalable.c
tcp_timer.c [TCP]: Use LIMIT_NETDEBUG in tcp_retransmit_timer(). 2007-06-07 13:40:08 -07:00
tcp_vegas.c [TCP]: Congestion control API RTT sampling fix 2007-06-15 15:08:43 -07:00
tcp_vegas.h [TCP] TCP YEAH: Use vegas dont copy it. 2007-04-25 22:29:46 -07:00
tcp_veno.c [TCP]: Congestion control API RTT sampling fix 2007-06-15 15:08:43 -07:00
tcp_westwood.c
tcp_yeah.c [TCP] TCP YEAH: Use vegas dont copy it. 2007-04-25 22:29:46 -07:00
tcp.c [TCP] tcp_read_sock: Allow recv_actor() return return negative error value. 2007-06-23 23:07:50 -07:00
tunnel4.c
udp_impl.h [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
udp.c [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
udplite.c [UDP]: Revert 2-pass hashing changes. 2007-06-07 13:40:50 -07:00
xfrm4_input.c [IPSEC]: Fix panic when using inter address familiy IPsec on loopback. 2007-05-31 01:23:28 -07:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c [IPSEC]: Fix panic when using inter address familiy IPsec on loopback. 2007-05-31 01:23:28 -07:00
xfrm4_output.c
xfrm4_policy.c
xfrm4_state.c
xfrm4_tunnel.c