TCP
Is it slow?
keep alive & timeout
is it slow?
TCP Fast Open
Congestion Control
receive window – rwnd
How wide window can be?
Length === 16bit
2**16 === 65 535
Scale of window
Linux
- $> sysctl net.ipv4.tcp_window_scaling
- $> sysctl -w net.ipv4.tcp_window_scaling=1
Slow-Start
cwnd
data without ack: Math.min(rwnd, cwnd)
Slow-Start Restart (don't use too long)
How fast can file be downloaded?
275% faster
Head-of-line blocking
