Searched hist:e42866031ff03c89a5bdd2056c76dd6cb41c3d35 (Results 1 – 3 of 3) sorted by relevance
| /openbmc/linux/net/ipv4/ |
| H A D | tcp_bbr.c | diff e42866031ff03c89a5bdd2056c76dd6cb41c3d35 Wed Jan 17 14:11:01 CST 2018 Yuchung Cheng <ycheng@google.com> tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR
A persistent connection may send tiny amount of data (e.g. health-check)
for a long period of time. BBR's windowed min RTT filter may only see
RTT samples from delayed ACKs causing BBR to grossly over-estimate
the path delay depending how much the ACK was delayed at the receiver.
This patch skips RTT samples that are likely coming from delayed ACKs. Note
that it is possible the sender never obtains a valid measure to set the
min RTT. In this case BBR will continue to set cwnd to initial window
which seems fine because the connection is thin stream.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
| H A D | tcp_input.c | diff e42866031ff03c89a5bdd2056c76dd6cb41c3d35 Wed Jan 17 14:11:01 CST 2018 Yuchung Cheng <ycheng@google.com> tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR
A persistent connection may send tiny amount of data (e.g. health-check)
for a long period of time. BBR's windowed min RTT filter may only see
RTT samples from delayed ACKs causing BBR to grossly over-estimate
the path delay depending how much the ACK was delayed at the receiver.
This patch skips RTT samples that are likely coming from delayed ACKs. Note
that it is possible the sender never obtains a valid measure to set the
min RTT. In this case BBR will continue to set cwnd to initial window
which seems fine because the connection is thin stream.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|
| /openbmc/linux/include/net/ |
| H A D | tcp.h | diff e42866031ff03c89a5bdd2056c76dd6cb41c3d35 Wed Jan 17 14:11:01 CST 2018 Yuchung Cheng <ycheng@google.com> tcp: avoid min RTT bloat by skipping RTT from delayed-ACK in BBR
A persistent connection may send tiny amount of data (e.g. health-check)
for a long period of time. BBR's windowed min RTT filter may only see
RTT samples from delayed ACKs causing BBR to grossly over-estimate
the path delay depending how much the ACK was delayed at the receiver.
This patch skips RTT samples that are likely coming from delayed ACKs. Note
that it is possible the sender never obtains a valid measure to set the
min RTT. In this case BBR will continue to set cwnd to initial window
which seems fine because the connection is thin stream.
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
Acked-by: Priyaranjan Jha <priyarjha@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
|