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Eric Dumazet 43e122b014 tcp: refine pacing rate determination 
When TCP pacing was added back in linux-3.12, we chose
to apply a fixed ratio of 200 % against current rate,
to allow probing for optimal throughput even during
slow start phase, where cwnd can be doubled every other gRTT.

At Google, we found it was better applying a different ratio
while in Congestion Avoidance phase.
This ratio was set to 120 %.

We've used the normal tcp_in_slow_start() helper for a while,
then tuned the condition to select the conservative ratio
as soon as cwnd >= ssthresh/2 :

- After cwnd reduction, it is safer to ramp up more slowly,
  as we approach optimal cwnd.
- Initial ramp up (ssthresh == INFINITY) still allows doubling
  cwnd every other RTT.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Neal Cardwell <ncardwell@google.com>
Cc: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2015-08-25 11:33:54 -07:00
..
9p
9p: switch p9_client_read() to passing struct iov_iter *
2015-04-11 22:28:27 -04:00
bluetooth
Bluetooth: add hci_connect_le_scan
2015-08-10 21:36:13 +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
af_iucv: fix recvmsg by replacing skb_pull() function
2013-04-08 17:16:57 -04:00
netfilter
netfilter: nf_conntrack: add efficient mark to zone mapping
2015-08-18 01:24:05 +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
net: remove my future former mail address
2012-06-17 16:29:38 -07:00
sctp
sctp: fix ASCONF list handling
2015-06-14 12:55:49 -07:00
tc_act
net_sched: act_mirred: remove spinlock in fast path
2015-07-08 13:50:42 -07:00
6lowpan.h
6lowpan: add generic 6lowpan netdev private data
2015-08-11 22:05:36 +02:00
act_api.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-07-31 23:52:20 -07:00
addrconf.h
ipv6: change ipv6_stub_impl.ipv6_dst_lookup to take net argument
2015-07-31 15:21:30 -07:00
af_ieee802154.h
ieee802154: mac802154: remove FSF address
2014-10-25 08:07:30 +02:00
af_rxrpc.h
af_rxrpc.h: Remove extern from function prototypes
2013-07-31 17:50:01 -07:00
af_unix.h
net/unix: support SCM_SECURITY for stream sockets
2015-06-10 22:49:20 -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
atm: clip: Use device neigh support on top of "arp_tbl".
2011-11-30 18:51:03 -05:00
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
bonding: Implement user key part of port_key in an AD system.
2015-05-11 10:59:32 -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
include/net/: Fix FSF address in file headers
2013-12-06 12:37:56 -05:00
dcbnl.h
net/dcb: Add IEEE QCN attribute
2015-03-06 21:50:02 -05:00
dn_dev.h
dn_dev: add support for IFA_FLAGS nl attribute
2013-12-10 21:50:00 -05:00
dn_fib.h
decnet (dn*.h): Remove extern from function prototypes
2013-09-20 14:49:32 -04:00
dn_neigh.h
netfilter: Pass socket pointer down through okfn().
2015-04-07 15:25:55 -04:00
dn_nsp.h
decnet (dn*.h): Remove extern from function prototypes
2013-09-20 14:49:32 -04:00
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
ipv6: Optimize ipv6_change_dsfield().
2013-01-09 23:59:53 -08:00
dst_metadata.h
route: move lwtunnel state to dst_entry
2015-08-20 15:42:36 -07:00
dst_ops.h
net: Remove protocol from struct dst_ops
2015-03-09 16:06:10 -04:00
dst.h
route: fix breakage after moving lwtunnel state
2015-08-23 16:51:17 -07:00
esp.h
net: move pskb_put() to core code
2013-11-07 19:28:58 -05:00
ethoc.h
net: ethoc: set up MII management bus clock
2014-02-04 20:19:51 -08:00
fib_rules.h
fib: Add fib rule match on tunnel id
2015-07-21 10:39:06 -07:00
firewire.h
firewire net, ipv4 arp: Extend hardware address and remove driver-level packet inspection.
2013-03-26 12:32:13 -04:00
flow_dissector.h
mpls: Add MPLS entropy label in flow_keys
2015-06-04 15:44:31 -07:00
flow.h
ipv6: route: extend flow representation with tunnel key
2015-08-20 15:42:37 -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
garp.h: Remove extern from function prototypes
2013-09-20 14:49:33 -04:00
gen_stats.h
net: sched: enable per cpu qstats
2014-09-30 01:02:26 -04:00
genetlink.h
net: Introduce possible_net_t
2015-03-12 14:39:40 -04:00
geneve.h
geneve: move definition of geneve_hdr() to geneve.h
2015-05-13 15:59:13 -04:00
gre.h
gre: Remove support for sharing GRE protocol hook.
2015-08-10 14:03:54 -07:00
gro_cells.h
ip_tunnel: Create percpu gro_cell
2015-01-18 01:56:32 -05:00
gue.h
gue: Protocol constants for remote checksum offload
2014-11-05 16:30:03 -05:00
icmp.h
icmp.h: Remove extern from function prototypes
2013-09-20 14:49:33 -04:00
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
inet: get rid of central tcp/dccp listener timer
2015-03-20 12:40:25 -04:00
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: fix child sockets to use system default congestion control if not set
2015-05-31 21:49:14 -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
inet: simplify timewait refcounting
2015-07-09 15:12:20 -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
inet: inet_twsk_deschedule factorization
2015-07-09 15:12:20 -07:00
inetpeer.h
tcp: simplify inetpeer_addr_base use
2015-03-31 13:58:35 -04:00
ip6_checksum.h
net: add gro_compute_pseudo functions
2014-08-24 18:09:23 -07:00
ip6_fib.h
route: move lwtunnel state to dst_entry
2015-08-20 15:42:36 -07:00
ip6_route.h
ipv6: Add rt6_get_cookie() function
2015-05-25 13:25:34 -04:00
ip6_tunnel.h
udp_tunnel: Pass UDP socket down through udp_tunnel{, 6}_xmit_skb().
2015-04-07 15:29:08 -04:00
ip_fib.h
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-07-31 23:52:20 -07:00
ip_tunnels.h
ip_tunnels: use tos and ttl fields also for IPv6
2015-08-20 15:42:36 -07:00
ip_vs.h
net: Introduce possible_net_t
2015-03-12 14:39:40 -04:00
ip.h
net: Set sk_txhash from a random number
2015-07-29 22:44:04 -07:00
ipcomp.h
…
ipconfig.h
…
ipv6.h
ipv6: Enable auto flow labels by default
2015-07-31 17:07:12 -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
lapb.h
lapb.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
lib80211.h
lib80211: remove unused print_ssid()
2014-10-14 02:18:27 +02:00
llc_c_ac.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_c_ev.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
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*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_pdu.h
net: llc: fix order of evaluation in llc_conn_ac_inc_vr_by_1
2014-01-01 22:22:43 -05:00
llc_s_ac.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc_s_ev.h
llc*.h: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
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: Remove extern from function prototypes
2013-09-21 14:01:38 -04:00
llc.h
llc: make lock static
2014-01-03 20:56:48 -05:00
lwtunnel.h
lwt: Add cfg argument to build_state
2015-08-24 10:34:40 -07:00
mac80211.h
mac80211: remove ieee80211_aes_cmac_calculate_k1_k2()
2015-08-13 11:31:45 +02:00
mac802154.h
mac802154: do not export ieee802154_rx()
2015-07-23 17:10:50 +02:00
mip6.h
include/net/: Fix FSF address in file headers
2013-12-06 12:37:56 -05:00
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
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2013-10-01 17:06:14 -04:00
ndisc.h
ipv6: ndisc: inherit metadata dst when creating ndisc requests
2015-08-20 15:42:37 -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
netevent/netlink.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
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
netrom.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
nexthop.h
…
nl802154.h
ieee802154: add ack request default handling
2015-08-10 20:43:06 +02:00
p8022.h
p8022.h: Remove extern from function prototypes
2013-09-21 14:01:39 -04:00
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: rename vlan_tx_* helpers since "tx" is misleading there
2015-01-13 17:51:08 -05:00
protocol.h
net: Eliminate no_check from protosw
2014-05-23 16:28:53 -04:00
psnap.h
psnap.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
raw.h
raw/rawv6.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
rawv6.h
raw/rawv6.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
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: provide SYN headers for passive connections
2015-05-05 16:02:34 -04:00
rose.h
rose.h: Remove extern from function prototypes
2013-09-23 01:51:08 -04:00
route.h
route: move lwtunnel state to dst_entry
2015-08-20 15:42:36 -07:00
rtnetlink.h
openvswitch: Use regular VXLAN net_device device
2015-07-21 10:39:07 -07:00
sch_generic.h
net: sched: extend percpu stats helpers
2015-07-08 13:50:41 -07:00
scm.h
scm.h: Remove extern from function prototypes
2013-09-23 01:51:09 -04:00
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
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
2015-07-31 23:52:20 -07:00
Space.h
drivers: net: Include new header file in sbni.c
2013-12-19 18:51:20 -05:00
stp.h
stp.h: Remove extern from function prototypes
2013-09-23 01:51:09 -04:00
switchdev.h
net: switchdev: support static FDB addresses
2015-08-11 12:03:19 -07:00
tcp_memcontrol.h
tcp_memcontrol: Kill struct tcp_memcontrol
2013-10-21 18:43:02 -04:00
tcp_states.h
inet: add TCP_NEW_SYN_RECV state
2015-03-12 22:58:12 -04:00
tcp.h
tcp: refine pacing rate determination
2015-08-25 11:33:54 -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
udp_tunnel: Pass UDP socket down through udp_tunnel{, 6}_xmit_skb().
2015-04-07 15:29:08 -04:00
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
vrf.h
vrf: vrf_master_ifindex_rcu is not always called with rcu read lock
2015-08-19 22:13:20 -07:00
vsock_addr.h
VSOCK: Move af_vsock.h and vsock_addr.h to include/net
2013-07-27 22:14:06 -07:00
vxlan.h
vxlan: GRO support at tunnel layer
2015-08-23 15:59:56 -07:00
wext.h
wext.h: Remove extern from function prototypes
2013-09-23 16:29:40 -04:00
wimax.h
net: treewide: Fix typo found in DocBook/networking.xml
2014-09-05 17:35:28 -07:00
x25.h
x25.h: Remove extern from function prototypes
2013-09-23 16:29:41 -04:00
x25device.h
…
xfrm.h
xfrm: Add oif to dst lookups
2015-08-11 12:41:35 +02:00