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Date: Sat, 27 Dec 2014 12:17:27 +0100
From: Bruno Prémont <bonbons@...ux-vserver.org>
To: Rick Jones <rick.jones2@...com>
Cc: Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
netdev@...r.kernel.org
Subject: Re: Marvell Kirkwood - MV643XX: near 100% UDP RX packet loss
On Thu, 25 December 2014 Rick Jones <rick.jones2@...com> wrote:
> > Why are so many packets being discarded?
>
> You should also check the netstat statistics, particularly UDP on the
> receiving side. Look before and after the test and see how they change,
> if at all.
Here they go.
Summary of numbers:
iperf UDP run, 5 seconds @ 1Gb/s
lost 71216/71776 packets
before after delta
ethtool:
rx_packets: 420001 688424 268423
rx_bytes: 433251917 809803463 376551546
rx_errors: 0 0 0
rx_dropped: 0 0 0
bad_octets_received: 0 0 0
bad_frames_received: 0 0 0
rx_discard: 159691 323123 163432
rx_overrun: 0 0 0
netstat, udp:
packets received 15559 16137 578
packets to unknown port received 18 18 0
packet receive errors 41599 83890 42291
packets sent 34697 34770 73
receive buffer errors 0 0 0
send buffer errors 0 0 0
Details of numbers:
ethtool -S eth0; netstat -ns; iperf3 -s -p 3740; netstat -ns; ethtool -S eth0
NIC statistics:
rx_packets: 420001
tx_packets: 158940
rx_bytes: 433251917
tx_bytes: 51728533
rx_errors: 0
tx_errors: 0
rx_dropped: 0
tx_dropped: 0
good_octets_received: 652309262
bad_octets_received: 0
internal_mac_transmit_err: 0
good_frames_received: 579692
bad_frames_received: 0
broadcast_frames_received: 3916
multicast_frames_received: 4369
frames_64_octets: 14938
frames_65_to_127_octets: 133791
frames_128_to_255_octets: 106501
frames_256_to_511_octets: 2974
frames_512_to_1023_octets: 80262
frames_1024_to_max_octets: 400166
good_octets_sent: 52557543
good_frames_sent: 158940
excessive_collision: 0
multicast_frames_sent: 428
broadcast_frames_sent: 9352
unrec_mac_control_received: 0
fc_sent: 0
good_fc_received: 0
bad_fc_received: 0
undersize_received: 0
fragments_received: 0
oversize_received: 0
jabber_received: 0
mac_receive_error: 0
bad_crc_event: 0
collision: 0
late_collision: 0
rx_discard: 159691
rx_overrun: 0
Ip:
416522 total packets received
8 with invalid addresses
0 forwarded
0 incoming packets discarded
193528 incoming packets delivered
164801 requests sent out
2 outgoing packets dropped
512 fragments dropped after timeout
265053 reassemblies required
42444 packets reassembled ok
3518 packet reassembles failed
2 fragments received ok
4 fragments created
Icmp:
64870 ICMP messages received
1730 input ICMP message failed.
ICMP input histogram:
destination unreachable: 21090
echo requests: 4912
echo replies: 38868
70216 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 21090
time exceeded: 6
echo request: 44208
echo replies: 4912
IcmpMsg:
InType0: 38868
InType3: 21090
InType8: 4912
OutType0: 4912
OutType3: 21090
OutType8: 44208
OutType11: 6
Tcp:
7 active connections openings
4 passive connection openings
0 failed connection attempts
0 connection resets received
5 connections established
20099 segments received
20688 segments send out
0 segments retransmited
0 bad segments received.
0 resets sent
Udp:
15559 packets received
18 packets to unknown port received.
41599 packet receive errors
34697 packets sent
0 receive buffer errors
0 send buffer errors
UdpLite:
TcpExt:
4 TCP sockets finished time wait in fast timer
7 delayed acks sent
5 delayed acks further delayed because of locked socket
3 packets directly queued to recvmsg prequeue.
254 bytes directly received in process context from prequeue
7990 packet headers predicted
3 packets header predicted and directly queued to user
301 acknowledgments not containing data payload received
10132 predicted acknowledgments
TCPRcvCoalesce: 7843
TCPOrigDataSent: 11810
IpExt:
InMcastPkts: 78
InBcastPkts: 303
InOctets: 421982031
OutOctets: 20785506
InMcastOctets: 2184
InBcastOctets: 43372
InNoECTPkts: 416523
-----------------------------------------------------------
Server listening on 3740
-----------------------------------------------------------
Accepted connection from 192.168.0.139, port 36178
[ 5] local 192.168.0.70 port 3740 connected to 192.168.0.139 port 55831
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 5] 0.00-1.02 sec 736 KBytes 5.93 Mbits/sec 7.017 ms 11481/11573 (99%)
[ 5] 1.02-2.02 sec 368 KBytes 3.01 Mbits/sec 9.887 ms 14867/14913 (1e+02%)
[ 5] 2.02-3.02 sec 560 KBytes 4.59 Mbits/sec 5.791 ms 14528/14598 (1e+02%)
[ 5] 3.02-4.02 sec 984 KBytes 8.06 Mbits/sec 7.613 ms 13972/14095 (99%)
[ 5] 4.02-5.04 sec 1.66 MBytes 13.7 Mbits/sec 4.602 ms 15842/16055 (99%)
[ 5] 5.04-5.25 sec 128 KBytes 4.80 Mbits/sec 3.809 ms 526/542 (97%)
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 5] 0.00-5.25 sec 562 MBytes 897 Mbits/sec 3.809 ms 71216/71776 (99%)
-----------------------------------------------------------
Server listening on 3740
-----------------------------------------------------------
^Ciperf3: interrupt - the server has terminated
Ip:
684863 total packets received
8 with invalid addresses
0 forwarded
0 incoming packets discarded
236661 incoming packets delivered
165154 requests sent out
2 outgoing packets dropped
512 fragments dropped after timeout
533112 reassemblies required
85295 packets reassembled ok
6421 packet reassembles failed
2 fragments received ok
4 fragments created
Icmp:
65021 ICMP messages received
1737 input ICMP message failed.
ICMP input histogram:
destination unreachable: 21144
echo requests: 4923
echo replies: 38954
70380 ICMP messages sent
0 ICMP messages failed
ICMP output histogram:
destination unreachable: 21144
time exceeded: 6
echo request: 44307
echo replies: 4923
IcmpMsg:
InType0: 38954
InType3: 21144
InType8: 4923
OutType0: 4923
OutType3: 21144
OutType8: 44307
OutType11: 6
Tcp:
7 active connections openings
5 passive connection openings
0 failed connection attempts
0 connection resets received
5 connections established
20203 segments received
20803 segments send out
0 segments retransmited
0 bad segments received.
0 resets sent
Udp:
16137 packets received
18 packets to unknown port received.
83890 packet receive errors
34770 packets sent
0 receive buffer errors
0 send buffer errors
UdpLite:
TcpExt:
4 TCP sockets finished time wait in fast timer
9 delayed acks sent
5 delayed acks further delayed because of locked socket
6 packets directly queued to recvmsg prequeue.
510 bytes directly received in process context from prequeue
8008 packet headers predicted
6 packets header predicted and directly queued to user
304 acknowledgments not containing data payload received
10211 predicted acknowledgments
TCPRcvCoalesce: 7859
TCPOrigDataSent: 11904
IpExt:
InMcastPkts: 78
InBcastPkts: 303
InOctets: 793681544
OutOctets: 20825320
InMcastOctets: 2184
InBcastOctets: 43372
InNoECTPkts: 684865
NIC statistics:
rx_packets: 688424
tx_packets: 159342
rx_bytes: 809803463
tx_bytes: 51782065
rx_errors: 0
tx_errors: 0
rx_dropped: 0
tx_dropped: 0
good_octets_received: 1258435196
bad_octets_received: 0
internal_mac_transmit_err: 0
good_frames_received: 1011547
bad_frames_received: 0
broadcast_frames_received: 3926
multicast_frames_received: 4384
frames_64_octets: 14978
frames_65_to_127_octets: 134201
frames_128_to_255_octets: 106794
frames_256_to_511_octets: 3006
frames_512_to_1023_octets: 152189
frames_1024_to_max_octets: 759721
good_octets_sent: 52613183
good_frames_sent: 159342
excessive_collision: 0
multicast_frames_sent: 428
broadcast_frames_sent: 9378
unrec_mac_control_received: 0
fc_sent: 0
good_fc_received: 0
bad_fc_received: 0
undersize_received: 0
fragments_received: 0
oversize_received: 0
jabber_received: 0
mac_receive_error: 0
bad_crc_event: 0
collision: 0
late_collision: 0
rx_discard: 323123
rx_overrun: 0
iperf on client side:
iperf3 -p 3740 -t 5 -b 0 -u -4 -c sheevaplug
Connecting to host sheevaplug, port 3740
[ 4] local 192.168.0.139 port 55831 connected to 192.168.0.70 port 3740
[ ID] Interval Transfer Bandwidth Total Datagrams
[ 4] 0.00-1.00 sec 114 MBytes 959 Mbits/sec 14630
[ 4] 1.00-2.00 sec 114 MBytes 959 Mbits/sec 14630
[ 4] 2.00-3.00 sec 114 MBytes 954 Mbits/sec 14560
[ 4] 3.00-4.00 sec 110 MBytes 926 Mbits/sec 14130
[ 4] 4.00-5.00 sec 109 MBytes 915 Mbits/sec 13960
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Jitter Lost/Total Datagrams
[ 4] 0.00-5.00 sec 562 MBytes 943 Mbits/sec 3.809 ms 71216/71776 (99%)
[ 4] Sent 71776 datagrams
iperf Done.
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