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730e700e2c
linux_dsm_epyc7002/net
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Jianfeng Wang 730e700e2c tcp: apply a floor of 1 for RTT samples from TCP timestamps 
For retransmitted packets, TCP needs to resort to using TCP timestamps
for computing RTT samples. In the common case where the data and ACK
fall in the same 1-millisecond interval, TCP senders with millisecond-
granularity TCP timestamps compute a ca_rtt_us of 0. This ca_rtt_us
of 0 propagates to rs->rtt_us.

This value of 0 can cause performance problems for congestion control
modules. For example, in BBR, the zero min_rtt sample can bring the
min_rtt and BDP estimate down to 0, reduce snd_cwnd and result in a
low throughput. It would be hard to mitigate this with filtering in
the congestion control module, because the proper floor to apply would
depend on the method of RTT sampling (using timestamp options or
internally-saved transmission timestamps).

This fix applies a floor of 1 for the RTT sample delta from TCP
timestamps, so that seq_rtt_us, ca_rtt_us, and rs->rtt_us will be at
least 1 * (USEC_PER_SEC / TCP_TS_HZ).

Note that the receiver RTT computation in tcp_rcv_rtt_measure() and
min_rtt computation in tcp_update_rtt_min() both already apply a floor
of 1 timestamp tick, so this commit makes the code more consistent in
avoiding this edge case of a value of 0.

Signed-off-by: Jianfeng Wang <jfwang@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Kevin Yang <yyd@google.com>
Acked-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2020-08-03 17:54:03 -07:00
..
6lowpan treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
9p Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
802 net: 802: psnap.c: Use built-in RCU list checking 2020-02-24 13:02:53 -08:00
8021q net: get rid of lockdep_set_class_and_subclass() 2020-06-28 21:37:23 -07:00
appletalk appletalk: Fix atalk_proc_init() return path 2020-08-03 15:48:32 -07:00
atm net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
batman-adv batman-adv: Introduce a configurable per interface hop penalty 2020-06-26 10:37:11 +02:00
bluetooth Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
bpf bpf: Add tests for PTR_TO_BTF_ID vs. null comparison 2020-06-30 22:21:29 +02:00
bpfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2020-08-03 16:03:18 -07:00
caif net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
can net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
ceph libceph: don't omit used_replica in target_copy() 2020-06-16 16:02:08 +02:00
core net: Pass NULL to skb_network_protocol() when we don't care about vlan depth 2020-08-03 15:38:31 -07:00
dcb dcb_doit: remove redundant skb check 2020-06-23 20:27:09 -07:00
dccp net: remove sockptr_advance 2020-07-28 13:43:40 -07:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2020-08-03 16:03:18 -07:00
dns_resolver docs: networking: convert dns_resolver.txt to ReST 2020-04-28 14:39:46 -07:00
dsa net: dsa: stop overriding master's ndo_get_phys_port_name 2020-07-23 15:14:58 -07:00
ethernet net: move devres helpers into a separate source file 2020-05-23 16:56:17 -07:00
ethtool ethtool: ethnl_set_linkmodes: remove redundant null check 2020-08-03 15:11:49 -07:00
hsr hsr: Use %pM format specifier for MAC addresses 2020-07-31 16:46:26 -07:00
ieee802154 net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
ife net: Fix Kconfig indentation 2019-09-26 08:56:17 +02:00
ipv4 tcp: apply a floor of 1 for RTT samples from TCP timestamps 2020-08-03 17:54:03 -07:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2020-08-03 16:03:18 -07:00
iucv net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
kcm net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
key Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
l2tp l2tp: improve API documentation in l2tp_core.h 2020-07-30 16:45:31 -07:00
l3mdev l3mdev: add infrastructure for table to VRF mapping 2020-06-20 17:22:22 -07:00
lapb treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
llc net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
mac802154 treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
mpls net: Removed the device type check to add mpls support for devices 2020-07-27 11:40:47 -07:00
mptcp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
ncsi net/ncsi: use eth_zero_addr() to clear mac address 2020-07-23 11:49:41 -07:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2020-08-03 16:03:18 -07:00
netlabel net: netlabel: kerneldoc fixes 2020-07-13 17:20:40 -07:00
netlink net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
netrom net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
nsh treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
openvswitch net: openvswitch: make masks cache size configurable 2020-08-03 15:17:48 -07:00
packet net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
phonet net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
psample net: psample: fix build error when CONFIG_INET is not enabled 2020-05-23 16:36:05 -07:00
qrtr Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
rfkill rfkill: Fix incorrect check to avoid NULL pointer dereference 2019-12-16 10:15:49 +01:00
rose net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
sched net/sched: act_ct: fix miss set mru for ovs after defrag in act_ct 2020-08-03 15:04:48 -07:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
smc net/smc: unique reason code for exceeded max dmb count 2020-07-27 10:30:01 -07:00
strparser
sunrpc xprtrdma: fix incorrect header size calculations 2020-07-15 13:01:01 -04:00
switchdev net: switchdev: kerneldoc fixes 2020-07-13 17:20:40 -07:00
tipc tipc: Use is_broadcast_ether_addr() instead of memcmp() 2020-08-03 16:21:46 -07:00
tls net: remove sockptr_advance 2020-07-28 13:43:40 -07:00
unix net: make ->{get,set}sockopt in proto_ops optional 2020-07-19 18:16:41 -07:00
vmw_vsock Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-07-25 17:49:04 -07:00
wimax
wireless Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
x25 net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
xdp net: pass a sockptr_t into ->setsockopt 2020-07-24 15:41:54 -07:00
xfrm Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
compat.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2020-08-02 01:02:12 -07:00
devres.c net: devres: rename the release callback of devm_register_netdev() 2020-06-30 15:57:34 -07:00
Kconfig net: ethtool: Remove PHYLIB direct dependency 2020-07-07 15:41:05 -07:00
Makefile net: move devres helpers into a separate source file 2020-05-23 16:56:17 -07:00
socket.c net: improve the user pointer check in init_user_sockptr 2020-07-28 13:43:40 -07:00
sysctl_net.c