Eric Dumazet fc6055a5ba net: Introduce skb_orphan_try() ... Transmitted skb might be attached to a socket and a destructor, for memory accounting purposes. Traditionally, this destructor is called at tx completion time, when skb is freed. When tx completion is performed by another cpu than the sender, this forces some cache lines to change ownership. XPS was an attempt to give tx completion to initial cpu. David idea is to call destructor right before giving skb to device (call to ndo_start_xmit()). Because device queues are usually small, orphaning skb before tx completion is not a big deal. Some drivers already do this, we could do it in upper level. There is one known exception to this early orphaning, called tx timestamping. It needs to keep a reference to socket until device can give a hardware or software timestamp. This patch adds a skb_orphan_try() helper, to centralize all exceptions to early orphaning in one spot, and use it in dev_hard_start_xmit(). "tbench 16" results on a Nehalem machine (2 X5570 @ 2.93GHz) before: Throughput 4428.9 MB/sec 16 procs after: Throughput 4448.14 MB/sec 16 procs UDP should get even better results, its destructor being more complex, since SOCK_USE_WRITE_QUEUE is not set (four atomic ops instead of one) Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2010-04-18 02:39:41 -07:00
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9p	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs	2010-04-05 13:42:54 -07:00
802	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
8021q	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
appletalk	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
atm	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
ax25	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
bluetooth	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
bridge	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
caif	net-caif: using kmalloc/kfree requires the include of slab.h	2010-04-01 00:28:49 -07:00
can	can: avoids a false warning	2010-04-13 03:03:14 -07:00
core	net: Introduce skb_orphan_try()	2010-04-18 02:39:41 -07:00
dcb	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
dccp	net: replace ipfragok with skb->local_df	2010-04-15 23:36:37 -07:00
decnet	net: fib_rules: decouple address families from real address families	2010-04-13 14:49:31 -07:00
dsa	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
econet	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ethernet	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
ieee802154	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-06 08:34:06 -07:00
ipv4	rfs: Receive Flow Steering	2010-04-16 16:01:27 -07:00
ipv6	ipv6: fix the comment of ip6_xmit()	2010-04-15 23:36:38 -07:00
ipx	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
irda	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
iucv	const: constify remaining dev_pm_ops	2009-12-15 08:53:25 -08:00
key	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
l2tp	net: replace ipfragok with skb->local_df	2010-04-15 23:36:37 -07:00
lapb	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
llc	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
mac80211	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem	2010-04-15 16:21:34 -04:00
netfilter	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
netlabel	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-06 08:34:06 -07:00
netlink	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
netrom	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
packet	packet: support for TX time stamps on RAW sockets	2010-04-13 01:30:48 -07:00
phonet	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
rds	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
rfkill	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
rose	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
rxrpc	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
sched	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
sctp	net: replace ipfragok with skb->local_df	2010-04-15 23:36:37 -07:00
sunrpc	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
tipc	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
unix	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
wanrouter	headers: smp_lock.h redux	2009-07-12 12:22:34 -07:00
wimax	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
wireless	Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next-2.6 into for-davem	2010-04-15 16:21:34 -04:00
x25	Merge branch 'master' of /home/davem/src/GIT/linux-2.6/	2010-04-11 02:44:30 -07:00
xfrm	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
Kconfig	l2tp: Split pppol2tp patch into separate l2tp and ppp parts	2010-04-03 14:56:02 -07:00
Makefile	l2tp: Split pppol2tp patch into separate l2tp and ppp parts	2010-04-03 14:56:02 -07:00
TUNABLE	…
compat.c	include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h	2010-03-30 22:02:32 +09:00
nonet.c	…
socket.c	Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6	2010-04-11 14:53:53 -07:00
sysctl_net.c	net: spread __net_init, __net_exit	2010-01-17 19:16:02 -08:00