tcp: improve PRR loss recovery
This patch improves TCP PRR loss recovery behavior for a corner
case. Previously during PRR conservation-bound mode, it strictly
sends the amount equals to the amount newly acked or s/acked.
The patch changes s.t. PRR may send additional amount that was banked
previously (e.g. application-limited) in the conservation-bound
mode, similar to the slow-start mode. This unifies and simplifies the
algorithm further and may improve the recovery latency. This change
still follow the general packet conservation design principle and
always keep inflight/cwnd below the slow start threshold set
by the congestion control module.
PRR is described in RFC 6937. We'll include this change in the
latest revision rfc6937-bis as well.
Reported-by: Neal Cardwell <email@example.com>
Signed-off-by: Yuchung Cheng <firstname.lastname@example.org>
Signed-off-by: Neal Cardwell <email@example.com>
Signed-off-by: Eric Dumazet <firstname.lastname@example.org>
Signed-off-by: Jakub Kicinski <email@example.com>
1 file changed