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6e3a8a937c
linux/net
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Eric Dumazet 6e3a8a937c tcp_cubic: add SNMP counters to track how effective is Hystart 
When deploying FQ pacing, one thing we noticed is that CUBIC Hystart
triggers too soon.

Having SNMP counters to have an idea of how often the various Hystart
methods trigger is useful prior to any modifications.

This patch adds SNMP counters tracking, how many time "ack train" or
"Delay" based Hystart triggers, and cumulative sum of cwnd at the time
Hystart decided to end SS (Slow Start)

myhost:~# nstat -a | grep Hystart
TcpExtTCPHystartTrainDetect     9                  0.0
TcpExtTCPHystartTrainCwnd       20650              0.0
TcpExtTCPHystartDelayDetect     10                 0.0
TcpExtTCPHystartDelayCwnd       360                0.0

->
 Train detection was triggered 9 times, and average cwnd was
 20650/9=2294,
 Delay detection was triggered 10 times and average cwnd was 36

Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-12-09 14:58:23 -05:00
..
6lowpan 6lowpan: move skb_free from error paths in decompression 2014-11-06 22:09:48 +01:00
9p
802
8021q vlan: Pass ethtool get_ts_info queries to real device. 2014-11-21 15:35:53 -05:00
appletalk new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
atm [atm] switch vcc_sendmsg() to copy_from_iter() 2014-11-24 05:16:42 -05:00
ax25 new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
batman-adv
bluetooth new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2014-12-05 20:56:46 -08:00
caif new helper: memcpy_to_msg() 2014-11-24 04:28:51 -05:00
can new helper: memcpy_to_msg() 2014-11-24 04:28:51 -05:00
ceph libceph: change from BUG to WARN for __remove_osd() asserts 2014-11-13 22:26:34 +03:00
core net: avoid two atomic operations in fast clones 2014-12-09 13:40:20 -05:00
dcb dcbnl : Disable software interrupts before taking dcb_lock 2014-11-16 14:50:52 -05:00
dccp new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
decnet new helper: memcpy_to_msg() 2014-11-24 04:28:51 -05:00
dns_resolver
dsa net: dsa: replace count*size kzalloc by kcalloc 2014-11-16 14:41:39 -05:00
ethernet
hsr
ieee802154 new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
ipv4 tcp_cubic: add SNMP counters to track how effective is Hystart 2014-12-09 14:58:23 -05:00
ipv6 ipv6: remove useless spin_lock/spin_unlock 2014-12-09 13:18:09 -05:00
ipx switch ipxrtr_route_packet() from iovec to msghdr 2014-11-24 04:28:49 -05:00
irda new helper: memcpy_to_msg() 2014-11-24 04:28:51 -05:00
iucv new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
key new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
l2tp new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
lapb
llc new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
mac80211 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-21 22:28:24 -05:00
mac802154 ieee802154: fix byteorder for short address and panid 2014-11-17 09:49:17 +01:00
mpls net: Remove MPLS GSO feature. 2014-11-05 23:52:33 -08:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nf-next 2014-12-05 20:56:46 -08:00
netlabel
netlink new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
netrom new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
nfc new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
openvswitch Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-21 22:28:24 -05:00
packet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-29 20:47:48 -08:00
phonet new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
rds rds: switch rds_message_copy_from_user() to iov_iter 2014-11-24 05:16:43 -05:00
rfkill
rose new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
rxrpc net: Add and use skb_copy_datagram_msg() helper. 2014-11-05 16:46:40 -05:00
sched net: sched: cls: remove unused op put from tcf_proto_ops 2014-12-09 14:49:02 -05:00
sctp switch sctp_user_addto_chunk() and sctp_datamsg_from_user() to passing iov_iter 2014-11-24 05:16:40 -05:00
sunrpc SUNRPC: Fix locking around callback channel reply receive 2014-11-19 12:03:20 -05:00
switchdev bridge: call netdev_sw_port_stp_update when bridge port STP status changes 2014-12-02 20:01:22 -08:00
tipc tipc: fix missing spinlock init and nullptr oops 2014-12-09 13:41:54 -05:00
unix switch AF_PACKET and AF_UNIX to skb_copy_datagram_from_iter() 2014-11-24 05:16:39 -05:00
vmw_vsock vmci_transport: switch ->enqeue_dgram, ->enqueue_stream and ->dequeue_stream to msghdr 2014-11-24 05:16:42 -05:00
wimax
wireless nl80211: Broadcast CMD_NEW_INTERFACE and CMD_DEL_INTERFACE 2014-11-19 19:02:42 +01:00
x25 new helper: memcpy_from_msg() 2014-11-24 04:28:48 -05:00
xfrm Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next 2014-12-08 21:30:21 -05:00
compat.c fold verify_iovec() into copy_msghdr_from_user() 2014-11-19 16:23:49 -05:00
Kconfig net: introduce generic switch devices support 2014-12-02 20:01:20 -08:00
Makefile net: introduce generic switch devices support 2014-12-02 20:01:20 -08:00
nonet.c
socket.c fold verify_iovec() into copy_msghdr_from_user() 2014-11-19 16:23:49 -05:00
sysctl_net.c