Eric Dumazet 5e140dfc1f net: reorder struct Qdisc for better SMP performance ... dev_queue_xmit() needs to dirty fields "state", "q", "bstats" and "qstats" On x86_64 arch, they currently span three cache lines, involving more cache line ping pongs than necessary, making longer holding of queue spinlock. We can reduce this to one cache line, by grouping all read-mostly fields at the beginning of structure. (Or should I say, all highly modified fields at the end :) ) Before patch : offsetof(struct Qdisc, state)=0x38 offsetof(struct Qdisc, q)=0x48 offsetof(struct Qdisc, bstats)=0x80 offsetof(struct Qdisc, qstats)=0x90 sizeof(struct Qdisc)=0xc8 After patch : offsetof(struct Qdisc, state)=0x80 offsetof(struct Qdisc, q)=0x88 offsetof(struct Qdisc, bstats)=0xa0 offsetof(struct Qdisc, qstats)=0xac sizeof(struct Qdisc)=0xc0 Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2009-03-20 01:33:32 -07:00
..
9p	9p: fix sparse warnings	2008-10-22 18:54:47 -05:00
bluetooth	Bluetooth: Ask upper layers for HCI disconnect reason	2009-02-27 06:14:43 +01:00
irda	irda: Add irda_skb_cb qdisc related padding	2008-12-17 15:44:58 -08:00
iucv	[S390] iucv: Locking free version of iucv_message_(receive|send)	2008-12-25 13:39:04 +01:00
netfilter	netfilter: conntrack: don't deliver events for racy packets	2009-03-16 15:06:42 +01:00
netns	netns: ipmr: declare reg_vif_num per-namespace	2009-01-22 13:57:40 -08:00
phonet	Phonet: use per-namespace devices list	2009-01-26 21:03:35 -08:00
sctp	sctp: Fix broken RTO-doubling for data retransmits	2009-03-02 22:49:18 -08:00
tc_act
tipc
act_api.h
addrconf.h
af_rxrpc.h
af_unix.h	net: Fix soft lockups/OOM issues w/ unix garbage collector	2008-11-26 15:32:27 -08:00
ah.h
arp.h
atmclip.h	clip: convert to internal network_device_stats	2009-01-21 14:01:59 -08:00
ax25.h
ax88796.h
cfg80211.h	cfg80211: move enum reg_set_by to nl80211.h	2009-03-16 18:09:40 -04:00
checksum.h	include/net net/ - csum_partial - remove unnecessary casts	2008-11-19 15:44:53 -08:00
cipso_ipv4.h	netlabel: Update kernel configuration API	2008-12-31 12:54:11 -05:00
compat.h
datalink.h
dcbnl.h	net: fix DCB setstate to return success/failure	2008-12-21 20:09:50 -08:00
dn_dev.h
dn_fib.h	decnet: remove private wrappers of endian helpers	2008-11-27 00:12:47 -08:00
dn_neigh.h
dn_nsp.h
dn_route.h
dn.h	decnet: compile fix for removal of byteorder wrapper	2008-11-27 23:04:13 -08:00
dsa.h	dsa: add support for Trailer tagging format	2008-10-08 17:24:16 -07:00
dsfield.h
dst.h	netns xfrm: lookup in netns	2008-11-25 17:35:18 -08:00
esp.h
fib_rules.h
flow.h	netns xfrm: lookup in netns	2008-11-25 17:35:18 -08:00
garp.h
gen_stats.h	pkt_sched: gen_estimator: Optimize gen_estimator_active()	2008-11-26 15:24:32 -08:00
genetlink.h
icmp.h
ieee80211_radiotap.h	wireless: clean up radiotap a bit	2008-12-05 09:32:59 -05:00
if_inet6.h
inet6_connection_sock.h
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
inet_connection_sock.h
inet_ecn.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
inet_frag.h	inet fragments: fix sparse warning: context imbalance	2009-02-26 23:13:35 -08:00
inet_hashtables.h	net: move bsockets outside of read only beginning of struct inet_hashinfo	2009-02-01 12:31:33 -08:00
inet_sock.h	tcp: Port redirection support for TCP	2008-10-01 07:46:49 -07:00
inet_timewait_sock.h	net: Convert TCP & DCCP hash tables to use RCU / hlist_nulls	2008-11-16 19:40:17 -08:00
inetpeer.h
ip6_checksum.h
ip6_fib.h
ip6_route.h
ip6_tunnel.h
ip_fib.h
ip_vs.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
ip.h	ip: support for TX timestamps on UDP and RAW sockets	2009-02-15 22:43:38 -08:00
ipcomp.h
ipconfig.h
ipip.h	inet: Make tunnel RX/TX byte counters more consistent	2008-10-09 12:03:17 -07:00
ipv6.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
ipx.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
iw_handler.h
lapb.h
lib80211.h	wireless: missing include in lib80211.h	2008-11-21 11:42:55 -05:00
llc_c_ac.h
llc_c_ev.h
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h
mac80211.h	mac80211: Add software scan notifiers	2009-02-27 14:52:51 -05:00
mip6.h
ndisc.h	ipv6: Fix sporadic sendmsg -EINVAL when sending to multicast groups.	2009-01-04 16:04:39 -08:00
neighbour.h	net: Cleanup of neighbour code	2008-11-12 00:54:54 -08:00
net_namespace.h	netns: Remove net_alive	2009-03-03 01:14:27 -08:00
netdma.h	net_dma: convert to dma_find_channel	2009-01-06 11:38:15 -07:00
netevent.h
netlabel.h	netlabel: Update kernel configuration API	2008-12-31 12:54:11 -05:00
netlink.h	netlink: fix (theoretical) overrun in message iteration	2008-12-25 17:21:17 -08:00
netrom.h	netrom: convert to internal net_device_stats	2009-01-21 14:02:01 -08:00
nexthop.h
p8022.h
pkt_cls.h	ematch: simpler tcf_em_unregister()	2008-11-16 23:01:49 -08:00
pkt_sched.h	pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler.	2009-02-01 01:12:42 -08:00
protocol.h	ipv6: Add GRO support	2009-01-08 10:40:57 -08:00
psnap.h
raw.h
rawv6.h
red.h
request_sock.h	net: Fix memory leak in the proto_register function	2008-11-21 16:45:22 -08:00
rose.h
route.h	ipv4: Conditionally enable transparent flow flag when connecting	2008-10-01 07:35:39 -07:00
rtnetlink.h
sch_generic.h	net: reorder struct Qdisc for better SMP performance	2009-03-20 01:33:32 -07:00
scm.h	Merge branch 'master' into next	2008-11-14 11:29:12 +11:00
slhc_vj.h
snmp.h
sock.h	Merge branch 'master' of /home/davem/src/GIT/linux-2.6/	2009-02-24 03:50:29 -08:00
stp.h
tcp_states.h
tcp.h	tcp: simplify tcp_current_mss	2009-03-15 20:09:54 -07:00
timewait_sock.h	net: Fix memory leak in the proto_register function	2008-11-21 16:45:22 -08:00
transp_v6.h	net: replace __constant_{endian} uses in net headers	2009-02-14 22:58:35 -08:00
udp.h	udp: Use hlist_nulls in UDP RCU code	2008-11-16 19:39:21 -08:00
udplite.h	udp: introduce struct udp_table and multiple spinlocks	2008-10-29 01:41:45 -07:00
wext.h
wimax.h	wimax: fix typo in kernel-doc for debugfs_dentry in struct wimax_dev	2009-01-11 00:06:32 -08:00
wireless.h	cfg80211: Add AP beacon regulatory hints	2009-02-27 14:52:59 -05:00
x25.h
x25device.h
xfrm.h	netns xfrm: per-netns sysctls	2008-11-25 18:00:48 -08:00