jm + rtt   5

[net-next,14/14] tcp_bbr: add BBR congestion control
This commit implements a new TCP congestion control algorithm: BBR
(Bottleneck Bandwidth and RTT). A detailed description of BBR will be
published in ACM Queue, Vol. 14 No. 5, September-October 2016, as
"BBR: Congestion-Based Congestion Control".

BBR has significantly increased throughput and reduced latency for
connections on Google's internal backbone networks and and
YouTube Web servers.

BBR requires only changes on the sender side, not in the network or
the receiver side. Thus it can be incrementally deployed on today's
Internet, or in datacenters. [....]

Signed-off-by: Van Jacobson <>
google  linux  tcp  ip  congestion-control  bufferbloat  patches  algorithms  rtt  bandwidth  youtube  via:bradfitz 
september 2016 by jm
_Measuring Mobile Web Performance_ [slides]
Notable slide is #13, displaying a graph of HSDPA packet RTTs measured from a train. Max RTT gets up to 20,266ms. ouch
rtt  packets  latency  hsdpa  mobile  internet  trains  packet-loss 
june 2013 by jm
Passively Monitoring Network Round-Trip Times - Boundary
'how Boundary uses [TCP timestamps] to calculate round-trip times (RTTs) between any two hosts by passively monitoring TCP traffic flows, i.e., without actively launching ICMP echo requests (pings). The post is primarily an overview of this one aspect of TCP monitoring, it also outlines the mechanism we are using, and demonstrates its correctness.'
tcp  boundary  monitoring  network  ip  passive-monitoring  rtt  timestamping 
february 2013 by jm
Why upgrading your Linux Kernel will make your customers much happier
enabling TCP Slow Start on the HTTP server-side decreased internet round-trip page load time by 21% in this case; comments suggest an "ip route" command can also work
tcp  performance  linux  network  web  http  rtt  slow-start  via:jacob 
march 2012 by jm

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