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linux/net/ipv4
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Yuchung Cheng 3759824da8 tcp: PRR uses CRB mode by default and SS mode conditionally 
PRR slow start is often too aggressive especially when drops are
caused by traffic policers. The policers mainly use token bucket
to enforce the rate so sending (twice) faster than the delivery
rate causes excessive drops.

This patch changes PRR to the conservative reduction bound
(CRB) mode in RFC 6937 by default. CRB follows the packet
conservation rule to send at most the delivery rate by default.

But if many packets are lost and the pipe is empty, CRB may take N
round trips to repair N losses. We conditionally turn on slow start
mode if all these conditions are made to speed up the recovery:

  1) on the second round or later in recovery
  2) retransmission sent in the previous round is delivered on this ACK
  3) no retransmission is marked lost on this ACK

By using packet conservation by default, this change reduces the loss
retransmits signicantly on networks that deploy traffic policers,
up to 20% reduction of overall loss rate.

Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2015-07-08 13:29:46 -07:00
..
netfilter net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
Kconfig tcp: add CDG congestion control 2015-06-11 00:09:12 -07:00
Makefile tcp: add CDG congestion control 2015-06-11 00:09:12 -07:00
af_inet.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
ah4.c
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arp.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
cipso_ipv4.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
datagram.c
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devinet.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
esp4.c esp4: Switch to new AEAD interface 2015-05-28 11:23:20 +08:00
fib_frontend.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fib_lookup.h ipv4: FIB Local/MAIN table collapse 2015-03-11 16:22:14 -04:00
fib_rules.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fib_semantics.c ipv4: fix RCU lockdep warning from linkdown changes 2015-06-28 16:47:12 -07:00
fib_trie.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
fou.c fou: avoid missing unlock in failure path 2015-04-16 12:11:19 -04:00
geneve_core.c geneve_core: identify as driver library in modules description 2015-05-13 15:59:13 -04:00
gre_demux.c
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gre_offload.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
icmp.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
igmp.c net: Export IGMP/MLD message validation code 2015-05-04 14:49:23 -04:00
inet_connection_sock.c tcp: improve REUSEADDR/NOREUSEADDR cohabitation 2015-05-21 18:55:32 -04:00
inet_diag.c net: inet_diag: export IPV6_V6ONLY sockopt 2015-06-24 02:51:39 -07:00
inet_fragment.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
inet_hashtables.c tcp: connect() from bound sockets can be faster 2015-05-27 14:30:10 -04:00
inet_lro.c
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inet_timewait_sock.c tcp/dccp: tw_timer_handler() is static 2015-05-13 15:21:33 -04:00
inetpeer.c
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ip_forward.c ip: reject too-big defragmented DF-skb when forwarding 2015-05-25 00:08:48 -04:00
ip_fragment.c ip_fragment: don't forward defragmented DF packet 2015-05-27 13:03:31 -04:00
ip_gre.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ip_input.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
ip_options.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
ip_output.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2015-06-15 14:30:32 -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 udp_tunnel: Pass UDP socket down through udp_tunnel{, 6}_xmit_skb(). 2015-04-07 15:29:08 -04:00
ip_tunnel_core.c ip_tunnel: Report Rx dropped in ip_tunnel_get_stats64 2015-05-14 22:30:54 -04:00
ip_vti.c ip_vti/ip6_vti: Preserve skb->mark after rcv_cb call 2015-05-28 06:23:32 +02:00
ipcomp.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ipconfig.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
ipip.c ipip: fix one sparse error 2015-05-17 13:08:29 -04:00
ipmr.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
netfilter.c netfilter: don't use module_init/exit in core IPV4 code 2015-06-16 14:12:34 -04:00
ping.c ipv4: Missing sk_nulls_node_init() in ping_unhash(). 2015-05-01 22:02:47 -04:00
proc.c tcp: add TCPWinProbe and TCPKeepAlive SNMP counters 2015-05-09 16:42:32 -04:00
protocol.c
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raw.c Merge branch 'for-davem' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2015-04-13 18:18:05 -04:00
route.c net: ipv4 sysctl option to ignore routes when nexthop link is down 2015-06-24 02:15:54 -07:00
syncookies.c tcp: get_cookie_sock() consolidation 2015-06-07 15:19:52 -07:00
sysctl_net_ipv4.c net: limit tcp/udp rmem/wmem to SOCK_{RCV,SND}BUF_MIN 2015-05-30 17:37:44 -07:00
tcp.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-24 02:58:51 -07:00
tcp_bic.c
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tcp_cdg.c tcp: cdg: use div_u64() 2015-06-14 12:57:45 -07:00
tcp_cong.c tcp: fix child sockets to use system default congestion control if not set 2015-05-31 21:49:14 -07:00
tcp_cubic.c tcp: restore 1.5x per RTT limit to CUBIC cwnd growth in congestion avoidance 2015-03-11 16:51:51 -04:00
tcp_dctcp.c net: tcp: dctcp_update_alpha() fixes. 2015-06-10 23:28:33 -07:00
tcp_diag.c sock_diag: implement a get_info handler for inet 2015-06-15 19:49:22 -07:00
tcp_fastopen.c tcp: Do not call tcp_fastopen_reset_cipher from interrupt context 2015-06-23 02:38:10 -07:00
tcp_highspeed.c
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tcp_htcp.c
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tcp_hybla.c
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tcp_illinois.c tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_input.c tcp: PRR uses CRB mode by default and SS mode conditionally 2015-07-08 13:29:46 -07:00
tcp_ipv4.c tcp: remove redundant checks II 2015-06-07 01:55:01 -07:00
tcp_lp.c
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tcp_memcontrol.c
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tcp_metrics.c tcp: RFC7413 option support for Fast Open client 2015-04-07 18:36:39 -04:00
tcp_minisocks.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2015-06-01 22:51:30 -07:00
tcp_offload.c tcp: reserve tcp_skb_mss() to tcp stack 2015-06-11 16:33:10 -07:00
tcp_output.c tcp: remove obsolete check in tcp_set_skb_tso_segs() 2015-06-11 16:33:11 -07:00
tcp_probe.c
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tcp_scalable.c
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tcp_timer.c tcp: introduce tcp_under_memory_pressure() 2015-05-17 22:45:48 -04:00
tcp_vegas.c tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_vegas.h tcp: prepare CC get_info() access from getsockopt() 2015-04-29 17:10:38 -04:00
tcp_veno.c
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tcp_westwood.c tcp_westwood: fix tcp_westwood_info() 2015-05-05 19:50:09 -04:00
tcp_yeah.c
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tunnel4.c
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udp.c ipv4/udp: Verify multicast group is ours in upd_v4_early_demux() 2015-06-04 00:46:26 -07:00
udp_diag.c sock_diag: specify info_size per inet protocol 2015-06-15 19:49:22 -07:00
udp_impl.h net: Remove iocb argument from sendmsg and recvmsg 2015-03-02 13:06:31 -05:00
udp_offload.c ipv4: coding style: comparison for inequality with NULL 2015-04-03 12:11:15 -04:00
udp_tunnel.c net: Modify sk_alloc to not reference count the netns of kernel sockets. 2015-05-11 10:50:18 -04:00
udplite.c
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xfrm4_input.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
xfrm4_mode_beet.c
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xfrm4_mode_transport.c
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xfrm4_mode_tunnel.c ipv4: hash net ptr into fragmentation bucket selection 2015-03-25 14:07:04 -04:00
xfrm4_output.c netfilter: Pass socket pointer down through okfn(). 2015-04-07 15:25:55 -04:00
xfrm4_policy.c ipv4: coding style: comparison for equality with NULL 2015-04-03 12:11:15 -04:00
xfrm4_protocol.c
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xfrm4_state.c
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xfrm4_tunnel.c
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