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ca6fb06518836ef9b65dc0aac02ff97704d52a05
linux/include/net
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Eric Dumazet ca6fb06518 tcp: attach SYNACK messages to request sockets instead of listener 
If a listen backlog is very big (to avoid syncookies), then
the listener sk->sk_wmem_alloc is the main source of false
sharing, as we need to touch it twice per SYNACK re-transmit
and TX completion.

(One SYN packet takes listener lock once, but up to 6 SYNACK
are generated)

By attaching the skb to the request socket, we remove this
source of contention.

Tested:

 listen(fd, 10485760); // single listener (no SO_REUSEPORT)
 16 RX/TX queue NIC
 Sustain a SYNFLOOD attack of ~320,000 SYN per second,
 Sending ~1,400,000 SYNACK per second.
 Perf profiles now show listener spinlock being next bottleneck.

    20.29%  [kernel]  [k] queued_spin_lock_slowpath
    10.06%  [kernel]  [k] __inet_lookup_established
     5.12%  [kernel]  [k] reqsk_timer_handler
     3.22%  [kernel]  [k] get_next_timer_interrupt
     3.00%  [kernel]  [k] tcp_make_synack
     2.77%  [kernel]  [k] ipt_do_table
     2.70%  [kernel]  [k] run_timer_softirq
     2.50%  [kernel]  [k] ip_finish_output
     2.04%  [kernel]  [k] cascade

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-10-03 04:32:43 -07:00
..
9p
9p: switch p9_client_read() to passing struct iov_iter *
2015-04-11 22:28:27 -04:00
bluetooth
Bluetooth: Add BT_ERR_RATELIMITED
2015-09-18 09:53:19 +02:00
caif
caif: fix a signedness bug in cfpkt_iterate()
2015-02-20 17:35:14 -05:00
irda
irda: Convert function pointer arrays and uses to const
2014-12-10 15:33:16 -05:00
iucv
s390/iucv: do not use arrays as argument
2015-09-21 16:03:04 -07:00
netfilter
bridge: Pass net into br_validate_ipv4 and br_validate_ipv6
2015-09-29 20:21:32 +02:00
netns
Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next
2015-08-04 23:57:45 -07:00
nfc
nfc: netlink: Add capability to reply to vendor_cmd with data
2015-08-20 22:00:11 +02:00
phonet
…
sctp
sctp: fix ASCONF list handling
2015-06-14 12:55:49 -07:00
tc_act
act_connmark: Remember the struct net instead of guessing it.
2015-09-18 21:59:31 +02:00
6lowpan.h
ieee802154: 6lowpan: remove tx full-size calc workaround
2015-09-17 13:20:04 +02:00
act_api.h
net_sched: make tcf_hash_destroy() static
2015-08-26 11:01:44 -07:00
addrconf.h
ipv6: remove unused neigh parameter from ndisc functions
2015-09-24 12:26:08 -07:00
af_ieee802154.h
ieee802154: af_ieee802154: fix typo in comment.
2015-09-17 13:20:05 +02:00
af_rxrpc.h
…
af_unix.h
af_unix: Convert the unix_sk macro to an inline function for type safety
2015-09-29 13:47:07 -07:00
af_vsock.h
net: Pass kern from net_proto_family.create to sk_alloc
2015-05-11 10:50:17 -04:00
ah.h
ipsec: Remove obsolete MAX_AH_AUTH_LEN
2014-09-18 10:54:36 +02:00
arp.h
neigh: Factor out ___neigh_lookup_noref
2015-03-04 00:23:23 -05:00
atmclip.h
…
ax25.h
ax25: Stop using sock->sk_protinfo.
2015-06-28 16:55:44 -07:00
ax88796.h
…
bond_3ad.h
bonding: Implement port churn-machine (AD standard 43.4.17).
2015-02-24 16:05:48 -05:00
bond_alb.h
net: Move bonding headers under include/net
2014-11-10 13:27:49 -05:00
bond_options.h
bonding: convert num_grat_arp to the new bonding option API
2015-07-27 01:05:24 -07:00
bonding.h
net/bonding: Export bond_option_active_slave_get_rcu
2015-08-30 18:08:50 -04:00
busy_poll.h
sched, net: Fixup busy_loop_us_clock()
2014-01-13 17:39:11 +01:00
cfg80211-wext.h
…
cfg80211.h
Merge branch 'mac80211' into mac80211-next
2015-07-17 15:39:41 +02:00
cfg802154.h
ieee802154: add ack request default handling
2015-08-10 20:43:06 +02:00
checksum.h
net: Add inet_proto_csum_replace_by_diff utility function
2015-08-17 21:33:06 -07:00
cipso_ipv4.h
cipso: don't use IPCB() to locate the CIPSO IP option
2015-02-11 14:46:37 -05:00
cls_cgroup.h
cls_cgroup: factor out classid retrieval
2015-07-20 12:41:30 -07:00
codel.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-05-13 14:31:43 -04:00
compat.h
net: switch importing msghdr from userland to {compat_,}import_iovec()
2015-04-09 00:02:26 -04:00
datalink.h
net: Move prototype declaration to header file include/net/datalink.h from net/ipx/af_ipx.c
2014-02-09 17:32:50 -08:00
dcbevent.h
…
dcbnl.h
net/dcb: Add IEEE QCN attribute
2015-03-06 21:50:02 -05:00
dn_dev.h
…
dn_fib.h
…
dn_neigh.h
netfilter: Pass net into okfn
2015-09-17 17:18:37 -07:00
dn_nsp.h
…
dn_route.h
net: Move prototype declaration to appropriate header file from decnet/af_decnet.c
2014-02-09 17:32:49 -08:00
dn.h
net: Move prototype declaration to header file include/net/dn.h from net/decnet/af_decnet.c
2014-02-09 17:32:49 -08:00
dsa.h
net: dsa: Add dsa_is_dsa_port() helper
2015-08-18 14:17:21 -07:00
dsfield.h
…
dst_metadata.h
tun_dst: Remove opts_size
2015-08-31 21:23:42 -07:00
dst_ops.h
net: Remove protocol from struct dst_ops
2015-03-09 16:06:10 -04:00
dst.h
inet: constify ip_route_output_flow() socket argument
2015-09-25 13:00:37 -07:00
esp.h
…
ethoc.h
net/ethoc: support big-endian register layout
2015-09-23 15:33:15 -07:00
fib_rules.h
net: ipv6: use common fib_default_rule_pref
2015-09-09 14:19:50 -07:00
firewire.h
…
flow_dissector.h
flow_dissector: Don't use bit fields.
2015-09-01 16:46:08 -07:00
flow.h
net: Fix vti use case with oif in dst lookups
2015-09-17 16:36:34 -07:00
flowcache.h
flowcache: Make flow cache name space aware
2014-02-12 07:02:11 +01:00
fou.h
ip_tunnel: Ops registration for secondary encap (fou, gue)
2014-11-12 15:01:35 -05:00
garp.h
…
gen_stats.h
net: sched: enable per cpu qstats
2014-09-30 01:02:26 -04:00
genetlink.h
genetlink: simplify genl_notify
2015-09-24 12:25:23 -07:00
geneve.h
geneve: Consolidate Geneve functionality in single module.
2015-08-27 15:42:48 -07:00
gre.h
gre: Remove support for sharing GRE protocol hook.
2015-08-10 14:03:54 -07:00
gro_cells.h
gro_cells: remove spinlock protecting receive queues
2015-08-31 15:17:17 -07:00
gue.h
gue: Protocol constants for remote checksum offload
2014-11-05 16:30:03 -05:00
icmp.h
…
ieee80211_radiotap.h
mac80211: propagate STBC / LDPC flags to radiotap
2014-02-06 09:34:58 +01:00
ieee802154_netdev.h
mac802154: cleanup llsec param flags
2015-06-12 11:42:29 +02:00
if_inet6.h
ipv6: do retries on stable privacy addresses
2015-03-23 22:12:09 -04:00
inet6_connection_sock.h
ipv6: remove obsolete inet6 functions
2015-10-03 04:32:42 -07:00
inet6_hashtables.h
ipv6: get rid of __inet6_hash()
2015-03-18 22:00:35 -04:00
inet_common.h
net: Modify sk_alloc to not reference count the netns of kernel sockets.
2015-05-11 10:50:18 -04:00
inet_connection_sock.h
tcp/dccp: install syn_recv requests into ehash table
2015-10-03 04:32:41 -07:00
inet_ecn.h
tunnel: fix RFC number in comment for INET_ECN_decapsulate()
2014-05-07 15:30:52 -04:00
inet_frag.h
inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test
2015-07-26 21:00:15 -07:00
inet_hashtables.h
tcp/dccp: install syn_recv requests into ehash table
2015-10-03 04:32:41 -07:00
inet_sock.h
inet: add IP_BIND_ADDRESS_NO_PORT to overcome bind(0) limitations
2015-06-06 23:57:12 -07:00
inet_timewait_sock.h
tcp/dccp: fix timewait races in timer handling
2015-09-21 16:32:29 -07:00
inetpeer.h
net: Add support for VRFs to inetpeer cache
2015-08-28 13:32:36 -07:00
ip6_checksum.h
net: add gro_compute_pseudo functions
2014-08-24 18:09:23 -07:00
ip6_fib.h
ipv6: include NLM_F_REPLACE in route replace notifications
2015-09-17 15:00:27 -07:00
ip6_route.h
ipv6: Add rt6_get_cookie() function
2015-05-25 13:25:34 -04:00
ip6_tunnel.h
ip6tunnel: make rx/tx bytes counters consistent
2015-09-20 22:36:42 -07:00
ip_fib.h
net: Fix behaviour of unreachable, blackhole and prohibit routes
2015-09-20 21:45:08 -07:00
ip_tunnels.h
ipv4: send arp replies to the correct tunnel
2015-09-24 14:31:36 -07:00
ip_vs.h
ipvs: Remove skb_sknet
2015-09-24 09:34:43 +09:00
ip.h
ip: constify ip_build_and_send_pkt() socket argument
2015-09-25 13:00:38 -07:00
ipcomp.h
…
ipconfig.h
…
ipv6.h
ipv6: constify ip6_xmit() sock argument
2015-09-25 13:00:38 -07:00
ipx.h
switch ipxrtr_route_packet() from iovec to msghdr
2014-11-24 04:28:49 -05:00
iw_handler.h
wext: add checked wrappers for adding events/points to streams
2015-02-28 21:31:12 +01:00
l3mdev.h
net: Move netif_index_is_l3_master to l3mdev.h
2015-09-29 20:40:34 -07:00
lapb.h
…
lib80211.h
lib80211: remove unused print_ssid()
2014-10-14 02:18:27 +02:00
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
llc: Make llc_conn_ev_qfyr_t function pointer arrays const
2014-12-10 15:21:24 -05:00
llc_conn.h
net: Pass kern from net_proto_family.create to sk_alloc
2015-05-11 10:50:17 -04:00
llc_if.h
…
llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
llc: Make llc_sap_action_t function pointer arrays const
2014-12-10 15:21:24 -05:00
llc_sap.h
…
llc.h
…
lwtunnel.h
lwt: Add cfg argument to build_state
2015-08-24 10:34:40 -07:00
mac80211.h
mac80211: protect non-HT BSS when HT TDLS traffic exists
2015-09-04 14:25:46 +02:00
mac802154.h
ieee802154: 6lowpan: check on valid 802.15.4 frame
2015-09-17 13:20:04 +02:00
mip6.h
…
mld.h
ipv6: mld: answer mldv2 queries with mldv1 reports in mldv1 fallback
2014-09-22 16:23:15 -04:00
mpls_iptunnel.h
mpls: ip tunnel support
2015-07-21 10:39:05 -07:00
mpls.h
openvswitch: Add basic MPLS support to kernel
2014-11-05 23:52:33 -08:00
mrp.h
…
ndisc.h
ipv6: remove unused neigh parameter from ndisc functions
2015-09-24 12:26:08 -07:00
neighbour.h
net: add explicit logging and stat for neighbour table overflow
2015-08-10 13:46:21 -07:00
net_namespace.h
netfilter: nfacct: per network namespace support
2015-08-07 11:50:56 +02:00
net_ratelimit.h
…
netevent.h
…
netlabel.h
netlabel: fix the netlbl_catmap_setlong() dummy function
2014-08-07 20:55:21 -04:00
netlink.h
netlink: implement nla_get_in_addr and nla_get_in6_addr
2015-03-31 13:58:35 -04:00
netprio_cgroup.h
cgroup: clean up cgroup_subsys names and initialization
2014-02-08 10:36:58 -05:00
netrom.h
…
nexthop.h
…
nl802154.h
ieee802154: add ack request default handling
2015-08-10 20:43:06 +02:00
p8022.h
…
ping.h
net: Remove iocb argument from sendmsg and recvmsg
2015-03-02 13:06:31 -05:00
pkt_cls.h
net: sched: remove tcf_proto from ematch calls
2014-10-06 18:02:32 -04:00
pkt_sched.h
net: sched: consolidate tc_classify{,_compat}
2015-08-27 14:18:48 -07:00
protocol.h
net: Eliminate no_check from protosw
2014-05-23 16:28:53 -04:00
psnap.h
…
raw.h
…
rawv6.h
…
red.h
reciprocal_divide: update/correction of the algorithm
2014-01-21 23:17:20 -08:00
regulatory.h
cfg80211: allow wiphy specific regdomain management
2014-12-17 11:49:55 +01:00
request_sock.h
tcp/dccp: shrink struct listen_sock
2015-10-03 04:32:42 -07:00
rose.h
…
route.h
net: Move netif_index_is_l3_master to l3mdev.h
2015-09-29 20:40:34 -07:00
rtnetlink.h
rtnetlink: RTEXT_FILTER_SKIP_STATS support to avoid dumping inet/inet6 stats
2015-09-15 15:25:02 -07:00
sch_generic.h
bpf: add bpf_redirect() helper
2015-09-17 21:09:07 -07:00
scm.h
…
secure_seq.h
inetpeer: get rid of ip_id_count
2014-06-02 11:00:41 -07:00
slhc_vj.h
…
snmp.h
Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu
2014-10-15 07:48:18 +02:00
sock.h
net: constify sk_gfp_atomic() sock argument
2015-09-29 16:53:08 -07:00
Space.h
…
stp.h
…
switchdev.h
net: switchdev: extract struct switchdev_obj_*
2015-09-29 21:32:00 -07:00
tcp_memcontrol.h
…
tcp_states.h
inet: add TCP_NEW_SYN_RECV state
2015-03-12 22:58:12 -04:00
tcp.h
tcp: attach SYNACK messages to request sockets instead of listener
2015-10-03 04:32:43 -07:00
timewait_sock.h
inet: remove BUG_ON() in twsk_destructor()
2015-07-09 15:12:20 -07:00
transp_v6.h
ipv6: make IPV6_RECVPKTINFO work for ipv4 datagrams
2014-01-19 19:53:18 -08:00
tso.h
net: Add a software TSO helper API
2014-05-22 14:57:15 -04:00
udp_tunnel.h
vxlan: do not receive IPv4 packets on IPv6 socket
2015-08-29 13:07:54 -07:00
udp.h
net: Remove iocb argument from sendmsg and recvmsg
2015-03-02 13:06:31 -05:00
udplite.h
net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter()
2015-02-04 01:34:15 -05:00
vsock_addr.h
…
vxlan.h
vxlan: support both IPv4 and IPv6 sockets in a single vxlan device
2015-09-26 22:40:55 -07:00
wext.h
…
wimax.h
net: treewide: Fix typo found in DocBook/networking.xml
2014-09-05 17:35:28 -07:00
x25.h
…
x25device.h
…
xfrm.h
xfrm: Remove unused afinfo method init_dst
2015-09-17 17:18:32 -07:00