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linux/net/ipv4
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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_core.c tunnels: harmonize cleanup done on skb on xmit path 2013-09-04 00:27:25 -04:00
ip_tunnel.c tunnels: harmonize cleanup done on skb on rx path 2013-09-04 00:27:26 -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_bic.c tcp: fix undo after RTO for BIC 2012-01-20 14:17:26 -05:00
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 inet_diag: Rename inet_diag_req into inet_diag_req_v2 2012-01-11 12:56:06 -08:00
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
tcp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2013-09-05 14:58:52 -04:00
tunnel4.c net: Convert printks to pr_<level> 2012-03-11 23:42:51 -07:00
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
udp.c net: unify skb_udp_tunnel_segment() and skb_udp6_tunnel_segment() 2013-08-31 22:30:01 -04:00
udplite.c net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
xfrm4_input.c net: Add skb_unclone() helper function. 2013-02-15 15:10:37 -05:00
xfrm4_mode_beet.c ipsec: be careful of non existing mac headers 2012-02-23 16:50:45 -05:00
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