Eric Dumazet b0983d3c9b tcp: fix dynamic right sizing ... Dynamic Right Sizing (DRS) is supposed to open TCP receive window automatically, but suffers from two bugs, presented by order of importance. 1) tcp_rcv_space_adjust() fix : Using twice the last received amount is very pessimistic, because it doesn't allow fast recovery or proper slow start ramp up, if sender wants to increase cwin by 100% every RTT. copied = bytes received in previous RTT 2*copied = bytes we expect to receive in next RTT 4*copied = bytes we need to advertise in rwin at end of next RTT DRS is one RTT late, it needs a 4x factor. If sender is not using ABC, and increases cwin by 50% every rtt, then we needed 1.5*1.5 = 2.25 factor. This is probably why this bug was not really noticed. 2) There is no window adjustment after first RTT. DRS triggers only after the second RTT. DRS needs two RTT to initialize, so tcp_fixup_rcvbuf() should setup sk_rcvbuf to allow proper window grow for first two RTT. This patch increases TCP efficiency particularly for large RTT flows when autotuning is used at the receiver, and more particularly in presence of packet losses. Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Cc: Van Jacobson <vanj@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2013-09-24 11:07:32 -04:00
..
netfilter	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-09-05 14:54:29 -07:00
af_inet.c	net: make snmp_mib_free static inline	2013-09-02 21:00:50 -07:00
ah4.c	ipv4: properly refresh rtable entries on pmtu/redirect events	2013-06-03 00:07:42 -07:00
arp.c	net: neighbour: Remove CONFIG_ARPD	2013-09-03 21:41:43 -04:00
cipso_ipv4.c	cipso: don't follow a NULL pointer when setsockopt() is called	2012-07-18 09:01:12 -07:00
datagram.c	ipv4: Add a socket release callback for datagram sockets	2013-01-21 14:17:05 -05:00
devinet.c	net: igmp: Allow user-space configuration of igmp unsolicited report interval	2013-08-09 11:27:46 -07:00
esp4.c	net: esp{4,6}: fix potential MTU calculation overflows	2013-08-05 12:26:50 -07:00
fib_frontend.c	netlink: fix splat in skb_clone with large messages	2013-06-27 22:44:16 -07:00
fib_lookup.h
fib_rules.c	fib_rules: fix suppressor names and default values	2013-08-03 10:40:23 -07:00
fib_semantics.c	ipv4: use next hop exceptions also for input routes	2013-06-28 21:27:47 -07:00
fib_trie.c	fib_trie: remove potential out of bound access	2013-08-05 15:26:11 -07:00
gre_demux.c	net: gre: move GSO functions to gre_offload	2013-07-03 14:37:39 -07:00
gre_offload.c	gso: Update tunnel segmentation to support Tx checksum offload	2013-07-11 12:18:49 -07:00
icmp.c	icmp: avoid allocating large struct on stack	2013-06-03 00:28:44 -07:00
igmp.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
inet_connection_sock.c	tcp: Remove TCPCT	2013-03-17 14:35:13 -04:00
inet_diag.c	netlink: rename ssk to sk in struct netlink_skb_params	2013-04-19 14:57:56 -04:00
inet_fragment.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2013-07-09 18:24:39 -07:00
inet_hashtables.c	inet: fix spacing in assignment	2013-07-11 12:02:39 -07:00
inet_lro.c	ipv4: replace ip_fast_csum with csum_replace2	2013-03-15 09:12:25 -04:00
inet_timewait_sock.c	hlist: drop the node parameter from iterators	2013-02-27 19:10:24 -08:00
inetpeer.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
ip_forward.c	ipv4: introduce rt_uses_gateway	2012-10-08 17:42:36 -04:00
ip_fragment.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-04-22 20:32:51 -04:00
ip_gre.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-08-16 15:37:26 -07:00
ip_input.c	net: add SNMP counters tracking incoming ECN bits	2013-08-08 22:24:59 -07:00
ip_options.c	net/ipv4: Ensure that location of timestamp option is stored	2013-03-12 05:35:39 -04:00
ip_output.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
ip_sockglue.c	net: prevent setting ttl=0 via IP_TTL	2013-01-08 17:57:10 -08:00
ip_tunnel.c	tunnels: harmonize cleanup done on skb on rx path	2013-09-04 00:27:26 -04:00
ip_tunnel_core.c	tunnels: harmonize cleanup done on skb on xmit path	2013-09-04 00:27:25 -04:00
ip_vti.c	ipip: add x-netns support	2013-08-15 01:00:20 -07:00
ipcomp.c	ipv4: properly refresh rtable entries on pmtu/redirect events	2013-06-03 00:07:42 -07:00
ipconfig.c	ipconfig: add informative timeout messages while waiting for carrier	2013-04-02 14:35:33 -04:00
ipip.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-09-05 14:58:52 -04:00
ipmr.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
Kconfig	net: neighbour: Remove CONFIG_ARPD	2013-09-03 21:41:43 -04:00
Makefile	net: gre: move GSO functions to gre_offload	2013-07-03 14:37:39 -07:00
netfilter.c	netfilter: add my copyright statements	2013-04-18 20:27:55 +02:00
ping.c	net: proc_fs: trivial: print UIDs as unsigned int	2013-08-15 14:37:46 -07:00
proc.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-08-16 15:37:26 -07:00
protocol.c	ipv4: Disallow non-namespace aware protocols to register.	2013-02-05 14:42:23 -05:00
raw.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
route.c	ipv4: raise IP_MAX_MTU to theoretical limit	2013-08-20 15:05:04 -07:00
syncookies.c	tcp: syncookies: reduce mss table to four values	2013-09-24 10:39:58 -04:00
sysctl_net_ipv4.c	tcp: TSO packets automatic sizing	2013-08-29 15:50:06 -04:00
tcp.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-09-05 14:58:52 -04:00
tcp_bic.c
tcp_cong.c	tcp: remove Appropriate Byte Count support	2013-02-05 14:51:16 -05:00
tcp_cubic.c	tcp: cubic: fix bug in bictcp_acked()	2013-08-07 10:35:08 -07:00
tcp_diag.c
tcp_fastopen.c	tcp: add server ip to encrypt cookie in fast open	2013-08-10 00:35:33 -07:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c	tcp: bool conversions	2012-05-17 14:59:59 -04:00
tcp_illinois.c	net: fix divide by zero in tcp algorithm illinois	2012-11-01 11:55:59 -04:00
tcp_input.c	tcp: fix dynamic right sizing	2013-09-24 11:07:32 -04:00
tcp_ipv4.c	tcp: Change return value of tcp_rcv_established()	2013-09-04 00:27:28 -04:00
tcp_lp.c
tcp_memcontrol.c	memcg: rename RESOURCE_MAX to RES_COUNTER_MAX	2013-09-12 15:38:02 -07:00
tcp_metrics.c	tcp: fix RTO calculated from cached RTT	2013-09-17 19:08:08 -04:00
tcp_minisocks.c	tcp: consolidate SYNACK RTT sampling	2013-07-22 17:53:42 -07:00
tcp_offload.c	net: tcp: move GRO/GSO functions to tcp_offload	2013-06-07 14:39:05 -07:00
tcp_output.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2013-09-05 14:58:52 -04:00
tcp_probe.c	tcp: Change return value of tcp_rcv_established()	2013-09-04 00:27:28 -04:00
tcp_scalable.c
tcp_timer.c	tcp: refactor F-RTO	2013-03-21 11:47:50 -04:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c
tcp_westwood.c	tcp: refactor F-RTO	2013-03-21 11:47:50 -04:00
tcp_yeah.c
tunnel4.c
udp.c	net: unify skb_udp_tunnel_segment() and skb_udp6_tunnel_segment()	2013-08-31 22:30:01 -04:00
udp_diag.c	netlink: rename ssk to sk in struct netlink_skb_params	2013-04-19 14:57:56 -04:00
udp_impl.h	ipv4: fix checkpatch errors	2012-04-15 12:37:19 -04:00
udp_offload.c	net: udp4: move GSO functions to udp_offload	2013-06-12 00:47:25 -07:00
udplite.c
xfrm4_input.c	net: Add skb_unclone() helper function.	2013-02-15 15:10:37 -05:00
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c	ip: generate unique IP identificator if local fragmentation is allowed	2013-09-19 14:11:15 -04:00
xfrm4_output.c	xfrm: revert ipv4 mtu determination to dst_mtu	2013-08-26 12:40:53 +02:00
xfrm4_policy.c	xfrm: make gc_thresh configurable in all namespaces	2013-02-06 11:36:29 +01:00
xfrm4_state.c	xfrm: make local error reporting more robust	2013-08-14 13:07:12 +02:00
xfrm4_tunnel.c	sit: add IPv4 over IPv4 support	2013-05-31 17:19:05 -07:00