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a21bba9454
linux/net
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Eric Dumazet a21bba9454 net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames() 
We can reduce pressure on dst entry refcount that slowdown UDP transmit
path on SMP machines. This pressure is visible on RTP servers when
delivering content to mediagateways, especially big ones, handling
thousand of streams. Several cpus send UDP frames to the same
destination, hence use the same dst entry.

This patch makes ip_push_pending_frames() steal the refcount its
callers had to take when filling inet->cork.dst.

This doesnt avoid all refcounting, but still gives speedups on SMP,
on UDP/RAW transmit path.

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2008-11-24 16:07:50 -08:00
..
9p net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
802 hippi: convert driver to net_device_ops 2008-11-20 20:32:15 -08:00
8021q vlan: convert to net_device_ops 2008-11-19 22:42:41 -08:00
appletalk netdevice: safe convert to netdev_priv() #part-4 2008-11-12 23:39:10 -08:00
atm netdevice: safe convert to netdev_priv() #part-4 2008-11-12 23:39:10 -08:00
ax25
bluetooth netdevice: safe convert to netdev_priv() #part-4 2008-11-12 23:39:10 -08:00
bridge netdev: add more functions to netdevice ops 2008-11-20 20:14:53 -08:00
can
core net: gen_estimator: Fix gen_kill_estimator() lookups 2008-11-24 15:48:05 -08:00
dcb DCB: Add support for DCB BCN 2008-11-20 21:10:23 -08:00
dccp dccp: Header option insertion routine for feature-negotiation 2008-11-23 16:10:23 -08:00
decnet net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
dsa Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
econet
ethernet eth: Declare an optimized compare_ether_addr_64bits() function 2008-11-23 23:24:32 -08:00
ipv4 net: avoid a pair of dst_hold()/dst_release() in ip_push_pending_frames() 2008-11-24 16:07:50 -08:00
ipv6 net: fix tunnels in netns after ndo_ changes 2008-11-23 17:26:26 -08:00
ipx
irda netdevice: safe convert to netdev_priv() #part-4 2008-11-12 23:39:10 -08:00
iucv
key af_key: mark policy as dead before destroying 2008-11-06 23:08:37 -08:00
lapb
llc net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
mac80211 net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-11 15:43:02 -08:00
netlabel net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
netlink net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-24 14:05:22 -08:00
netrom
packet net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-24 00:09:29 -08:00
phonet Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-20 16:44:00 -08:00
rfkill net: struct device - replace bus_id with dev_name(), dev_set_name() 2008-11-10 13:55:14 -08:00
rose
rxrpc
sched pkt_sched: sch_drr: fix drr_dequeue loop() 2008-11-24 15:46:08 -08:00
sctp net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-23 17:34:03 -08:00
sunrpc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-20 16:44:00 -08:00
tipc tipc: trivial endian annotation in debug statement 2008-11-07 23:37:50 -08:00
unix net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-24 00:09:29 -08:00
wanrouter netdevice wanrouter: Convert directly reference of netdev->priv 2008-11-20 04:26:21 -08:00
wireless wireless: clean up sysfs code using %pM 2008-11-21 11:08:19 -05:00
x25
xfrm net: Remove unused parameter of xfrm_gen_index() 2008-11-12 23:28:15 -08:00
compat.c reintroduce accept4 2008-11-19 18:49:57 -08:00
Kconfig net/ieee80211 -> drivers/net/ipw2x00/libipw_* rename 2008-11-21 11:08:18 -05:00
Makefile net/ieee80211 -> drivers/net/ipw2x00/libipw_* rename 2008-11-21 11:08:18 -05:00
nonet.c
socket.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-20 16:44:00 -08:00
sysctl_net.c
TUNABLE