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linux-stable/net/core
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Eric Dumazet cd28ca0a3d neigh: reduce arp latency 
Remove the artificial HZ latency on arp resolution.

Instead of firing a timer in one jiffy (up to 10 ms if HZ=100), lets
send the ARP message immediately.

Before patch :

# arp -d 192.168.20.108 ; ping -c 3 192.168.20.108
PING 192.168.20.108 (192.168.20.108) 56(84) bytes of data.
64 bytes from 192.168.20.108: icmp_seq=1 ttl=64 time=9.91 ms
64 bytes from 192.168.20.108: icmp_seq=2 ttl=64 time=0.065 ms
64 bytes from 192.168.20.108: icmp_seq=3 ttl=64 time=0.061 ms

After patch :

$ arp -d 192.168.20.108 ; ping -c 3 192.168.20.108
PING 192.168.20.108 (192.168.20.108) 56(84) bytes of data.
64 bytes from 192.168.20.108: icmp_seq=1 ttl=64 time=0.152 ms
64 bytes from 192.168.20.108: icmp_seq=2 ttl=64 time=0.064 ms
64 bytes from 192.168.20.108: icmp_seq=3 ttl=64 time=0.074 ms

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-08-12 02:55:28 -07:00
..
datagram.c
dev.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
dev_addr_lists.c net,rcu: convert call_rcu(ha_rcu_free) to kfree_rcu() 2011-05-07 22:50:52 -07:00
drop_monitor.c net,rcu: convert call_rcu(free_dm_hw_stat) to kfree_rcu() 2011-05-07 22:50:59 -07:00
dst.c net: fix potential neighbour race in dst_ifdown() 2011-08-09 21:47:14 -07:00
ethtool.c ethtool: Allow zero-length register dumps again 2011-07-21 15:25:30 -07:00
fib_rules.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
filter.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
flow.c atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
gen_estimator.c net,rcu: convert call_rcu(__gen_kill_estimator) to kfree_rcu() 2011-05-07 22:50:57 -07:00
gen_stats.c
iovec.c
kmap_skb.h
link_watch.c net: allow netif_carrier to be called safely from IRQ 2011-07-22 17:01:14 -07:00
Makefile net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-06 18:33:19 -07:00
neighbour.c neigh: reduce arp latency 2011-08-12 02:55:28 -07:00
net-sysfs.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
net-sysfs.h
net-traces.c core: add tracepoints for queueing skb to rcvbuf 2011-06-21 16:06:10 -07:00
net_namespace.c rtnl: provide link dump consistency info 2011-07-01 15:39:53 -07:00
netevent.c
netpoll.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
pktgen.c net: add IFF_SKB_TX_SHARED flag to priv_flags 2011-07-27 22:39:30 -07:00
request_sock.c
rtnetlink.c rtnetlink: remove initialization of dev->real_num_tx_queues 2011-08-11 07:44:38 -07:00
scm.c Allow passing O_PATH descriptors via SCM_RIGHTS datagrams 2011-03-15 02:21:45 -04:00
secure_seq.c net: Compute protocol sequence numbers and fragment IDs using MD5. 2011-08-06 18:33:19 -07:00
skbuff.c net: add kerneldoc to skb_copy_bits() 2011-08-01 18:03:06 -07:00
sock.c rcu: convert uses of rcu_assign_pointer(x, NULL) to RCU_INIT_POINTER 2011-08-02 04:29:23 -07:00
stream.c
sysctl_net_core.c net: Kill ratelimit.h dependency in linux/net.h 2011-05-27 13:41:33 -04:00
timestamping.c net: export the receive time stamping hook for non-NAPI drivers 2011-06-20 13:56:53 -07:00
user_dma.c
utils.c net: Kill ratelimit.h dependency in linux/net.h 2011-05-27 13:41:33 -04:00