Eric Dumazet 30927520db tcp_cubic: better follow cubic curve after idle period ... Jana Iyengar found an interesting issue on CUBIC : The epoch is only updated/reset initially and when experiencing losses. The delta "t" of now - epoch_start can be arbitrary large after app idle as well as the bic_target. Consequentially the slope (inverse of ca->cnt) would be really large, and eventually ca->cnt would be lower-bounded in the end to 2 to have delayed-ACK slow-start behavior. This particularly shows up when slow_start_after_idle is disabled as a dangerous cwnd inflation (1.5 x RTT) after few seconds of idle time. Jana initial fix was to reset epoch_start if app limited, but Neal pointed out it would ask the CUBIC algorithm to recalculate the curve so that we again start growing steeply upward from where cwnd is now (as CUBIC does just after a loss). Ideally we'd want the cwnd growth curve to be the same shape, just shifted later in time by the amount of the idle period. Reported-by: Jana Iyengar <jri@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Cc: Stephen Hemminger <stephen@networkplumber.org> Cc: Sangtae Ha <sangtae.ha@gmail.com> Cc: Lawrence Brakmo <lawrence@brakmo.org> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-09-10 10:58:33 -07:00
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netfilter	netfilter: nf_dup{4, 6}: fix build error when nf_conntrack disabled	2015-09-02 16:28:06 -07:00
Kconfig	geneve: Consolidate Geneve functionality in single module.	2015-08-27 15:42:48 -07:00
Makefile	geneve: Consolidate Geneve functionality in single module.	2015-08-27 15:42:48 -07:00
af_inet.c	net: Make table id type u32	2015-09-01 14:32:44 -07:00
ah4.c	ah4: Fix error return in ah_input().	2015-08-25 13:38:50 -07:00
arp.c	net: Fix up inet_addr_type checks	2015-08-13 22:43:21 -07:00
cipso_ipv4.c	…
datagram.c	net: Set sk_txhash from a random number	2015-07-29 22:44:04 -07:00
devinet.c	net/ipv4: suppress NETDEV_UP notification on address lifetime update	2015-07-28 23:38:13 -07:00
esp4.c	…
fib_frontend.c	net: Make table id type u32	2015-09-01 14:32:44 -07:00
fib_lookup.h	ipv4: consider TOS in fib_select_default	2015-07-24 22:46:11 -07:00
fib_rules.c	net: ipv6: use common fib_default_rule_pref	2015-09-09 14:19:50 -07:00
fib_semantics.c	net: Make table id type u32	2015-09-01 14:32:44 -07:00
fib_trie.c	net: FIB tracepoints	2015-08-29 13:05:16 -07:00
fou.c	fou: reject IPv6 config	2015-08-29 13:07:54 -07:00
gre_demux.c	gre: Remove support for sharing GRE protocol hook.	2015-08-10 14:03:54 -07:00
gre_offload.c	…
icmp.c	net: Add support for VRFs to inetpeer cache	2015-08-28 13:32:36 -07:00
igmp.c	IGMP: Inhibit reports for local multicast groups	2015-08-28 13:28:47 -07:00
inet_connection_sock.c	inet: fix potential deadlock in reqsk_queue_unlink()	2015-08-13 22:46:22 -07:00
inet_diag.c	net: inet_diag: always export IPV6_V6ONLY sockopt for listening sockets	2015-07-10 23:25:24 -07:00
inet_fragment.c	inet: frags: remove INET_FRAG_EVICTED and use list_evictor for the test	2015-07-26 21:00:15 -07:00
inet_hashtables.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-07-23 00:41:16 -07:00
inet_lro.c	…
inet_timewait_sock.c	inet: inet_twsk_deschedule factorization	2015-07-09 15:12:20 -07:00
inetpeer.c	net: Add helper function to compare inetpeer addresses	2015-08-28 13:32:36 -07:00
ip_forward.c	…
ip_fragment.c	net: Add support for VRFs to inetpeer cache	2015-08-28 13:32:36 -07:00
ip_gre.c	ip_tunnels: record IP version in tunnel info	2015-08-29 13:07:54 -07:00
ip_input.c	dst: Metadata destinations	2015-07-21 10:39:05 -07:00
ip_options.c	…
ip_output.c	net: Use VRF index for oif in ip_send_unicast_reply	2015-08-13 22:43:21 -07:00
ip_sockglue.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-06-24 02:58:51 -07:00
ip_tunnel.c	ip_gre: Add support to collect tunnel metadata.	2015-08-10 14:03:54 -07:00
ip_tunnel_core.c	ip-tunnel: Use API to access tunnel metadata options.	2015-08-31 12:28:56 -07:00
ip_vti.c	…
ipcomp.c	…
ipconfig.c	net: ipv4: increase dhcp inter device timeout	2015-08-12 16:40:22 -07:00
ipip.c	ip_gre: Add support to collect tunnel metadata.	2015-08-10 14:03:54 -07:00
ipmr.c	net: ipv6: use common fib_default_rule_pref	2015-09-09 14:19:50 -07:00
netfilter.c	…
ping.c	ipv6: Nonlocal bind	2015-07-09 21:09:10 -07:00
proc.c	net: track success and failure of TCP PMTU probing	2015-07-21 22:36:33 -07:00
protocol.c	…
raw.c	…
route.c	ip_tunnels: convert the mode field of ip_tunnel_info to flags	2015-08-29 13:07:54 -07:00
syncookies.c	…
sysctl_net_ipv4.c	IGMP: Inhibit reports for local multicast groups	2015-08-28 13:28:47 -07:00
tcp.c	tcp: fix slow start after idle vs TSO/GSO	2015-08-25 11:22:50 -07:00
tcp_bic.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_cdg.c	tcp: do not slow start when cwnd equals ssthresh	2015-07-09 14:22:52 -07:00
tcp_cong.c	tcp: use dctcp if enabled on the route to the initiator	2015-08-31 12:34:00 -07:00
tcp_cubic.c	tcp_cubic: better follow cubic curve after idle period	2015-09-10 10:58:33 -07:00
tcp_dctcp.c	…
tcp_diag.c	…
tcp_fastopen.c	…
tcp_highspeed.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_htcp.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_hybla.c	tcp: do not slow start when cwnd equals ssthresh	2015-07-09 14:22:52 -07:00
tcp_illinois.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_input.c	tcp: use dctcp if enabled on the route to the initiator	2015-08-31 12:34:00 -07:00
tcp_ipv4.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-08-13 16:23:11 -07:00
tcp_lp.c	…
tcp_memcontrol.c	…
tcp_metrics.c	net: Add helper function to compare inetpeer addresses	2015-08-28 13:32:36 -07:00
tcp_minisocks.c	inet: inet_twsk_deschedule factorization	2015-07-09 15:12:20 -07:00
tcp_offload.c	…
tcp_output.c	tcp: generate CA_EVENT_TX_START on data frames	2015-09-10 10:58:33 -07:00
tcp_probe.c	…
tcp_scalable.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_timer.c	tcp: do not export tcp_init_xmit_timers()	2015-07-09 21:44:38 -07:00
tcp_vegas.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_vegas.h	…
tcp_veno.c	tcp: add tcp_in_slow_start helper	2015-07-09 14:22:52 -07:00
tcp_westwood.c	…
tcp_yeah.c	…
tunnel4.c	…
udp.c	udp: Handle VRF device in sendmsg	2015-08-13 22:43:20 -07:00
udp_diag.c	…
udp_impl.h	…
udp_offload.c	…
udp_tunnel.c	tunnel: introduce udp_tun_rx_dst()	2015-08-27 15:42:47 -07:00
udplite.c	…
xfrm4_input.c	…
xfrm4_mode_beet.c	…
xfrm4_mode_transport.c	…
xfrm4_mode_tunnel.c	…
xfrm4_output.c	…
xfrm4_policy.c	xfrm: Use VRF master index if output device is enslaved	2015-08-25 11:25:09 -07:00
xfrm4_protocol.c	…
xfrm4_state.c	…
xfrm4_tunnel.c	…