Eric Dumazet c3916ad932 tcp: smoother receiver autotuning ... Back in linux-3.13 (commit b0983d3c9b ("tcp: fix dynamic right sizing")) I addressed the pressing issues we had with receiver autotuning. But DRS suffers from extra latencies caused by rcv_rtt_est.rtt_us drifts. One common problem happens during slow start, since the apparent RTT measured by the receiver can be inflated by ~50%, at the end of one packet train. Also, a single drop can delay read() calls by one RTT, meaning tcp_rcv_space_adjust() can be called one RTT too late. By replacing the tri-modal heuristic with a continuous function, we can offset the effects of not growing 'at the optimal time'. The curve of the function matches prior behavior if the space increased by 25% and 50% exactly. Cost of added multiply/divide is small, considering a TCP flow typically would run this part of the code few times in its life. I tested this patch with 100 ms RTT / 1% loss link, 100 runs of (netperf -l 5), and got an average throughput of 4600 Mbit instead of 1700 Mbit. Signed-off-by: Eric Dumazet <edumazet@google.com> Acked-by: Soheil Hassas Yeganeh <soheil@google.com> Acked-by: Wei Wang <weiwan@google.com> Acked-by: Neal Cardwell <ncardwell@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2017-12-12 10:53:04 -05:00
..
6lowpan	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
9p	make sock_alloc_file() do sock_release() on failures	2017-12-05 18:39:29 -05:00
802	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
8021q	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-12 09:17:05 +09:00
appletalk	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
atm	atm: mpoa: remove 32-bit timekeeping	2017-11-30 09:26:32 -05:00
ax25	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
batman-adv	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
bluetooth	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
bpf	bpf: add meta pointer for direct access	2017-09-26 13:36:44 -07:00
bridge	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
caif	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
can	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
ceph	We have a set of file locking improvements from Zheng, rbd rw/ro	2017-11-21 05:38:32 -10:00
core	rtnetlink: fix typo in GSO max segments	2017-12-11 09:45:59 -05:00
dcb	rtnetlink: make rtnl_register accept a flags parameter	2017-08-09 16:57:38 -07:00
dccp	dccp: CVE-2017-8824: use-after-free in DCCP code	2017-12-05 18:08:53 -05:00
decnet	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
dns_resolver	KEYS: Fix race between updating and finding a negative key	2017-10-18 09:12:40 +01:00
dsa	net: dsa: Allow compiling out legacy support	2017-12-07 14:14:54 -05:00
ethernet	networking: make skb_push & __skb_push return void pointers	2017-06-16 11:48:40 -04:00
hsr	net: hsr: Convert timers to use timer_setup()	2017-10-25 13:00:27 +09:00
ieee802154	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
ife	MAINTAINERS: Update Yotam's E-mail	2017-11-01 12:19:03 +09:00
ipv4	tcp: smoother receiver autotuning	2017-12-12 10:53:04 -05:00
ipv6	rhashtable: Change rhashtable_walk_start to return void	2017-12-11 09:58:38 -05:00
ipx	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
iucv	iucv: Convert sk_wmem_alloc accesses to refcount_t.	2017-07-03 02:31:22 -07:00
kcm	make sock_alloc_file() do sock_release() on failures	2017-12-05 18:39:29 -05:00
key	af_key: replace BUG_ON on WARN_ON in net_exit hook	2017-11-14 15:45:52 +09:00
l2tp	l2tp: exit_net cleanup check added	2017-11-14 15:45:53 +09:00
l3mdev	…
lapb	treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts	2017-11-21 16:35:54 -08:00
llc	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next	2017-11-15 11:56:19 -08:00
mac80211	rhashtable: Change rhashtable_walk_start to return void	2017-12-11 09:58:38 -05:00
mac802154	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
mpls	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
ncsi	treewide: setup_timer() -> timer_setup() (2 field)	2017-11-21 15:57:09 -08:00
netfilter	rhashtable: Change rhashtable_walk_start to return void	2017-12-11 09:58:38 -05:00
netlabel	net/netlabel: Add list_next_rcu() in rcu_dereference().	2017-11-18 10:32:41 +09:00
netlink	netlink: convert netlink tap spinlock to mutex	2017-12-11 10:56:55 -05:00
netrom	treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts	2017-11-21 16:35:54 -08:00
nfc	treewide: setup_timer() -> timer_setup()	2017-11-21 15:57:07 -08:00
nsh	openvswitch: enable NSH support	2017-11-08 16:12:33 +09:00
openvswitch	openvswitch: do not propagate headroom updates to internal port	2017-12-02 21:14:59 -05:00
packet	net/packet: fix a race in packet_bind() and packet_notifier()	2017-11-28 11:13:30 -05:00
phonet	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
psample	MAINTAINERS: Update Yotam's E-mail	2017-11-01 12:19:03 +09:00
qrtr	net: use rtnl_register_module where needed	2017-12-04 11:32:39 -05:00
rds	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-12-09 22:09:55 -05:00
rfkill	net: rfkill: gpio: Switch to devm_acpi_dev_add_driver_gpios()	2017-06-13 11:07:51 +02:00
rose	treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts	2017-11-21 16:35:54 -08:00
rxrpc	rxrpc: Use correct netns source in rxrpc_release_sock()	2017-12-03 10:05:20 -05:00
sched	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-12-09 22:09:55 -05:00
sctp	sctp: add support for the process of unordered idata	2017-12-11 11:23:05 -05:00
smc	smc: support variable CLC proposal messages	2017-12-07 15:03:12 -05:00
strparser	strparser: Use delayed work instead of timer for msg timeout	2017-10-25 10:37:11 +09:00
sunrpc	NFS client fixes for Linux 4.15-rc2	2017-12-01 20:04:20 -05:00
switchdev	net: bridge: Add/del switchdev object on host join/leave	2017-11-10 13:41:40 +09:00
tipc	rhashtable: Change rhashtable_walk_start to return void	2017-12-11 09:58:38 -05:00
tls	tls: don't override sk_write_space if tls_set_sw_offload fails.	2017-11-14 16:26:35 +09:00
unix	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-04 09:26:51 +09:00
vmw_vsock	VSOCK: fix outdated sk_state value in hvs_release()	2017-12-05 15:07:37 -05:00
wimax	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
wireless	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2017-11-29 13:10:25 -08:00
x25	treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts	2017-11-21 16:35:54 -08:00
xfrm	xfrm: Stop using dst->next in bundle construction.	2017-11-30 09:54:27 -05:00
Kconfig	net: Remove CONFIG_NETFILTER_DEBUG and _ASSERT() macros.	2017-09-04 13:25:20 +02:00
Makefile	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
compat.c	net: compat: assert the size of cmsg copied in is as expected	2017-09-20 15:36:18 -07:00
socket.c	make sock_alloc_file() do sock_release() on failures	2017-12-05 18:39:29 -05:00
sysctl_net.c	…