From: Yuchung Cheng <ych...@google.com> Date: Thu, 23 Jul 2020 12:00:06 -0700
> Previously TLP may send multiple probes of new data in one > flight. This happens when the sender is cwnd limited. After the > initial TLP containing new data is sent, the sender receives another > ACK that acks partial inflight. It may re-arm another TLP timer > to send more, if no further ACK returns before the next TLP timeout > (PTO) expires. The sender may send in theory a large amount of TLP > until send queue is depleted. This only happens if the sender sees > such irregular uncommon ACK pattern. But it is generally undesirable > behavior during congestion especially. > > The original TLP design restrict only one TLP probe per inflight as > published in "Reducing Web Latency: the Virtue of Gentle Aggression", > SIGCOMM 2013. This patch changes TLP to send at most one probe > per inflight. > > Note that if the sender is app-limited, TLP retransmits old data > and did not have this issue. > > Signed-off-by: Yuchung Cheng <ych...@google.com> > Signed-off-by: Neal Cardwell <ncardw...@google.com> > Signed-off-by: Eric Dumazet <eduma...@google.com> Applied and queued up for -stable, thanks!
