Hi:
TCP only sends a packet if:
tcp_packets_in_flight(tp) < tp->snd_cwnd
(function tcp_snd_test in include/net/tcp.h)
but regards transmission as application-limited if
tp->packets_out < tp->snd_cwnd
(function tcp_cwnd_validate in include/net/tcp.h)
So the kernel _always_ thinks the connection is
application-limited, forcing many un-necessary
reductions in the size of the congestion window.
I think the condition in tcp_snd_test should be:
tcp_packets_in_flight(tp) <= tp->snd_cwnd
Mark
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