The following reply was made to PR misc/173859; it has been noted by GNATS.
From: Marc Peters <m...@mpeters.org>
To: bug-follo...@freebsd.org, Marc Peters <m...@mpeters.org>
Cc:
Subject: Re: misc/173859: Low throughput on intercontinental connections
Date: Fri, 23 Nov 2012 16:03:36 +0100
As Adrian Chadd requested, the output of netstat -sp tcp before and
after sending/receiving a 100MB testfile (created with dd if=/dev/random
of=testfile bs=5M count=20 and copied by scp):
sending host, before:
tcp:
4 packets sent
4 data packets (2576 bytes)
0 data packets (0 bytes) retransmitted
0 data packets unnecessarily retransmitted
0 resends initiated by MTU discovery
0 ack-only packets (0 delayed)
0 URG only packets
0 window probe packets
0 window update packets
0 control packets
4 packets received
4 acks (for 2576 bytes)
0 duplicate acks
0 acks for unsent data
0 packets (0 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
0 out-of-order packets (0 bytes)
0 packets (0 bytes) of data after window
0 window probes
0 window update packets
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
0 discarded due to memory problems
0 connection requests
0 connection accepts
0 bad connection attempts
0 listen queue overflows
0 ignored RSTs in the windows
0 connections established (including accepts)
0 connections closed (including 0 drops)
0 connections updated cached RTT on close
0 connections updated cached RTT variance on close
0 connections updated cached ssthresh on close
0 embryonic connections dropped
4 segments updated rtt (of 1 attempt)
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 connections dropped by persist timeout
0 Connections (fin_wait_2) dropped because of timeout
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
4 correct ACK header predictions
0 correct data packet header predictions
0 syncache entries added
0 retransmitted
0 dupsyn
0 dropped
0 completed
0 bucket overflow
0 cache overflow
0 reset
0 stale
0 aborted
0 badack
0 unreach
0 zone failures
0 cookies sent
0 cookies received
0 hostcache entries added
0 bucket overflow
0 SACK recovery episodes
0 segment rexmits in SACK recovery episodes
0 byte rexmits in SACK recovery episodes
0 SACK options (SACK blocks) received
0 SACK options (SACK blocks) sent
0 SACK scoreboard overflow
0 packets with ECN CE bit set
0 packets with ECN ECT(0) bit set
0 packets with ECN ECT(1) bit set
0 successful ECN handshakes
0 times ECN reduced the congestion window
sending host, after:
tcp:
45248 packets sent
44477 data packets (105036153 bytes)
6 data packets (7548 bytes) retransmitted
0 data packets unnecessarily retransmitted
0 resends initiated by MTU discovery
763 ack-only packets (0 delayed)
0 URG only packets
0 window probe packets
0 window update packets
2 control packets
63733 packets received
44518 acks (for 105036057 bytes)
823 duplicate acks
0 acks for unsent data
817 packets (40385 bytes) received in-sequence
169 completely duplicate packets (192 bytes)
132 old duplicate packets
0 packets with some dup. data (0 bytes duped)
12 out-of-order packets (1056 bytes)
0 packets (0 bytes) of data after window
0 window probes
14627 window update packets
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
0 discarded due to memory problems
1 connection request
0 connection accepts
0 bad connection attempts
0 listen queue overflows
0 ignored RSTs in the windows
1 connection established (including accepts)
0 connections closed (including 0 drops)
0 connections updated cached RTT on close
0 connections updated cached RTT variance on close
0 connections updated cached ssthresh on close
0 embryonic connections dropped
44518 segments updated rtt (of 44248 attempts)
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 connections dropped by persist timeout
0 Connections (fin_wait_2) dropped because of timeout
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
1245 correct ACK header predictions
670 correct data packet header predictions
0 syncache entries added
0 retransmitted
0 dupsyn
0 dropped
0 completed
0 bucket overflow
0 cache overflow
0 reset
0 stale
0 aborted
0 badack
0 unreach
0 zone failures
0 cookies sent
0 cookies received
0 hostcache entries added
0 bucket overflow
0 SACK recovery episodes
0 segment rexmits in SACK recovery episodes
0 byte rexmits in SACK recovery episodes
0 SACK options (SACK blocks) received
0 SACK options (SACK blocks) sent
0 SACK scoreboard overflow
0 packets with ECN CE bit set
0 packets with ECN ECT(0) bit set
0 packets with ECN ECT(1) bit set
0 successful ECN handshakes
0 times ECN reduced the congestion window
receiving host, before:
tcp:
8 packets sent
8 data packets (2768 bytes)
0 data packets (0 bytes) retransmitted
0 data packets unnecessarily retransmitted
0 resends initiated by MTU discovery
0 ack-only packets (0 delayed)
0 URG only packets
0 window probe packets
0 window update packets
0 control packets
1 packet received
1 ack (for 48 bytes)
0 duplicate acks
0 acks for unsent data
0 packets (0 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
0 out-of-order packets (0 bytes)
0 packets (0 bytes) of data after window
0 window probes
0 window update packets
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
0 discarded due to memory problems
0 connection requests
0 connection accepts
0 bad connection attempts
0 listen queue overflows
0 ignored RSTs in the windows
0 connections established (including accepts)
0 connections closed (including 0 drops)
0 connections updated cached RTT on close
0 connections updated cached RTT variance on close
0 connections updated cached ssthresh on close
0 embryonic connections dropped
1 segment updated rtt (of 0 attempts)
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 connections dropped by persist timeout
0 Connections (fin_wait_2) dropped because of timeout
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
1 correct ACK header prediction
0 correct data packet header predictions
0 syncache entries added
0 retransmitted
0 dupsyn
0 dropped
0 completed
0 bucket overflow
0 cache overflow
0 reset
0 stale
0 aborted
0 badack
0 unreach
0 zone failures
0 cookies sent
0 cookies received
0 hostcache entries added
0 bucket overflow
0 SACK recovery episodes
0 segment rexmits in SACK recovery episodes
0 byte rexmits in SACK recovery episodes
0 SACK options (SACK blocks) received
0 SACK options (SACK blocks) sent
0 SACK scoreboard overflow
0 packets with ECN CE bit set
0 packets with ECN ECT(0) bit set
0 packets with ECN ECT(1) bit set
0 successful ECN handshakes
0 times ECN reduced the congestion window
receiving host, after:
tcp:
63748 packets sent
929 data packets (58374 bytes)
4 data packets (768 bytes) retransmitted
0 data packets unnecessarily retransmitted
0 resends initiated by MTU discovery
37099 ack-only packets (21 delayed)
0 URG only packets
0 window probe packets
25713 window update packets
3 control packets
84665 packets received
922 acks (for 57523 bytes)
27 duplicate acks
0 acks for unsent data
83191 packets (104368795 bytes) received in-sequence
0 completely duplicate packets (0 bytes)
0 old duplicate packets
0 packets with some dup. data (0 bytes duped)
523 out-of-order packets (653588 bytes)
0 packets (0 bytes) of data after window
0 window probes
1 window update packet
0 packets received after close
0 discarded for bad checksums
0 discarded for bad header offset fields
0 discarded because packet too short
0 discarded due to memory problems
0 connection requests
3 connection accepts
0 bad connection attempts
0 listen queue overflows
1 ignored RSTs in the window
3 connections established (including accepts)
66 connections closed (including 0 drops)
1 connection updated cached RTT on close
1 connection updated cached RTT variance on close
1 connection updated cached ssthresh on close
0 embryonic connections dropped
922 segments updated rtt (of 812 attempts)
0 retransmit timeouts
0 connections dropped by rexmit timeout
0 persist timeouts
0 connections dropped by persist timeout
0 Connections (fin_wait_2) dropped because of timeout
0 keepalive timeouts
0 keepalive probes sent
0 connections dropped by keepalive
786 correct ACK header predictions
83095 correct data packet header predictions
3 syncache entries added
0 retransmitted
0 dupsyn
0 dropped
3 completed
0 bucket overflow
0 cache overflow
0 reset
0 stale
0 aborted
0 badack
0 unreach
0 zone failures
3 cookies sent
0 cookies received
0 hostcache entries added
0 bucket overflow
0 SACK recovery episodes
0 segment rexmits in SACK recovery episodes
0 byte rexmits in SACK recovery episodes
0 SACK options (SACK blocks) received
0 SACK options (SACK blocks) sent
0 SACK scoreboard overflow
0 packets with ECN CE bit set
0 packets with ECN ECT(0) bit set
0 packets with ECN ECT(1) bit set
0 successful ECN handshakes
0 times ECN reduced the congestion window
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