Neal Cardwell d578e18ce9 tcp: restore 1.5x per RTT limit to CUBIC cwnd growth in congestion avoidance ... Commit 814d488c61 ("tcp: fix the timid additive increase on stretch ACKs") fixed a bug where tcp_cong_avoid_ai() would either credit a connection with an increase of snd_cwnd_cnt, or increase snd_cwnd, but not both, resulting in cwnd increasing by 1 packet on at most every alternate invocation of tcp_cong_avoid_ai(). Although the commit correctly implemented the CUBIC algorithm, which can increase cwnd by as much as 1 packet per 1 packet ACKed (2x per RTT), in practice that could be too aggressive: in tests on network paths with small buffers, YouTube server retransmission rates nearly doubled. This commit restores CUBIC to a maximum cwnd growth rate of 1 packet per 2 packets ACKed (1.5x per RTT). In YouTube tests this restored retransmit rates to low levels. Testing: This patch has been tested in datacenter netperf transfers and live youtube.com and google.com servers. Fixes: 9cd981dcf1 ("tcp: fix stretch ACK bugs in CUBIC") Signed-off-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2015-03-11 16:51:51 -04:00
..
netfilter	netfilter: nf_tables: fix port natting in little endian archs	2014-12-23 15:34:28 +01:00
af_inet.c	net: rfs: add hash collision detection	2015-02-08 16:53:57 -08:00
ah4.c
arp.c
cipso_ipv4.c	cipso: don't use IPCB() to locate the CIPSO IP option	2015-02-11 14:46:37 -05:00
datagram.c
devinet.c	net: spelling fixes	2015-02-14 20:36:08 -08:00
esp4.c
fib_frontend.c	fib_trie: Push rcu_read_lock/unlock to callers	2014-12-31 18:25:54 -05:00
fib_lookup.h	fib_trie: Move fib_find_alias to file where it is used	2015-01-25 14:47:16 -08:00
fib_rules.c	fib_trie: Push rcu_read_lock/unlock to callers	2014-12-31 18:25:54 -05:00
fib_semantics.c	fib_trie: Move fib_find_alias to file where it is used	2015-01-25 14:47:16 -08:00
fib_trie.c	fib_trie: Various clean-ups for handling slen	2015-01-25 14:47:16 -08:00
fou.c	gue: Use checksum partial with remote checksum offload	2015-02-11 15:12:13 -08:00
geneve.c	openvswitch: Add support for checksums on UDP tunnels.	2015-01-28 23:04:15 -08:00
gre_demux.c
gre_offload.c	gre: Set inner mac header in gro complete	2014-12-05 21:18:34 -08:00
icmp.c	ipv4: icmp: use percpu allocation	2015-01-31 17:48:18 -08:00
igmp.c
inet_connection_sock.c
inet_diag.c	netlink: make nlmsg_end() and genlmsg_end() void	2015-01-18 01:03:45 -05:00
inet_fragment.c
inet_hashtables.c
inet_lro.c
inet_timewait_sock.c
inetpeer.c
ip_forward.c	ipv4: try to cache dst_entries which would cause a redirect	2015-01-26 17:28:27 -08:00
ip_fragment.c	ipv4: ip_check_defrag should not assume that skb_network_offset is zero	2015-03-05 21:43:48 -05:00
ip_gre.c	gre/ipip: use be16 variants of netlink functions	2015-02-08 16:28:06 -08:00
ip_input.c
ip_options.c
ip_output.c	udp: only allow UFO for packets from SOCK_DGRAM sockets	2015-03-02 22:19:29 -05:00
ip_sockglue.c	ip: fix error queue empty skb handling	2015-03-08 23:01:54 -04:00
ip_tunnel.c	tunnels: advertise link netns via netlink	2015-01-19 14:32:03 -05:00
ip_tunnel_core.c
ip_vti.c	tunnels: advertise link netns via netlink	2015-01-19 14:32:03 -05:00
ipcomp.c
ipconfig.c	net: ipv4: handle DSA enabled master network devices	2015-01-19 15:45:10 -05:00
ipip.c	gre/ipip: use be16 variants of netlink functions	2015-02-08 16:28:06 -08:00
ipmr.c	netlink: make nlmsg_end() and genlmsg_end() void	2015-01-18 01:03:45 -05:00
Kconfig
Makefile
netfilter.c
ping.c	net: ping: Return EAFNOSUPPORT when appropriate.	2015-03-04 15:46:51 -05:00
proc.c	tcp: helpers to mitigate ACK loops by rate-limiting out-of-window dupacks	2015-02-08 01:03:12 -08:00
protocol.c
raw.c	net: switch memcpy_fromiovec()/memcpy_fromiovecend() users to copy_from_iter()	2015-02-04 01:34:15 -05:00
route.c	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2015-02-05 14:33:28 -08:00
syncookies.c
sysctl_net_ipv4.c	ipv4: Namespecify TCP PMTU mechanism	2015-02-09 18:45:00 -08:00
tcp.c	tcp: align tcp_xmit_size_goal() on tcp_tso_autosize()	2015-03-05 22:31:12 -05:00
tcp_bic.c	tcp: stretch ACK fixes prep	2015-01-28 22:18:37 -08:00
tcp_cong.c	tcp: fix tcp_cong_avoid_ai() credit accumulation bug with decreases in w	2015-03-11 16:51:51 -04:00
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
tcp_diag.c
tcp_fastopen.c	tcp: make sure skb is not shared before using skb_get()	2015-02-13 07:11:40 -08:00
tcp_highspeed.c
tcp_htcp.c
tcp_hybla.c
tcp_illinois.c
tcp_input.c	tcp: fix tcp_should_expand_sndbuf() to use tcp_packets_in_flight()	2015-02-22 23:07:11 -05:00
tcp_ipv4.c	ipv4: Namespecify TCP PMTU mechanism	2015-02-09 18:45:00 -08:00
tcp_lp.c
tcp_memcontrol.c	memcg: cleanup static keys decrement	2015-02-12 18:54:10 -08:00
tcp_metrics.c	netlink: make nlmsg_end() and genlmsg_end() void	2015-01-18 01:03:45 -05:00
tcp_minisocks.c	tcp: mitigate ACK loops for connections as tcp_timewait_sock	2015-02-08 01:03:13 -08:00
tcp_offload.c
tcp_output.c	ipv4: Namespecify TCP PMTU mechanism	2015-02-09 18:45:00 -08:00
tcp_probe.c
tcp_scalable.c	tcp: stretch ACK fixes prep	2015-01-28 22:18:37 -08:00
tcp_timer.c	ipv4: Namespecify TCP PMTU mechanism	2015-02-09 18:45:00 -08:00
tcp_vegas.c
tcp_vegas.h
tcp_veno.c	tcp: stretch ACK fixes prep	2015-01-28 22:18:37 -08:00
tcp_westwood.c
tcp_yeah.c	tcp: stretch ACK fixes prep	2015-01-28 22:18:37 -08:00
tunnel4.c
udp.c	ip: Add offset parameter to ip_cmsg_recv	2015-01-05 22:44:46 -05:00
udp_diag.c	udp_diag: Fix socket skipping within chain	2015-01-27 00:02:41 -08:00
udp_impl.h
udp_offload.c	udp: Set SKB_GSO_UDP_TUNNEL* in UDP GRO path	2015-02-11 15:12:10 -08:00
udp_tunnel.c	udp: Do not require sock in udp_tunnel_xmit_skb	2015-01-24 23:15:40 -08:00
udplite.c
xfrm4_input.c
xfrm4_mode_beet.c
xfrm4_mode_transport.c
xfrm4_mode_tunnel.c
xfrm4_output.c
xfrm4_policy.c
xfrm4_protocol.c
xfrm4_state.c
xfrm4_tunnel.c