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Date: 18 Oct 2008 13:36:29 +0200
From: "Arno J. Klaassen" <arno@...o.snv.jussieu.fr>
To: Rick Jones <rick.jones2@...com>
Cc: Andrew Morton <akpm@...ux-foundation.org>, netdev@...r.kernel.org,
bugme-daemon@...zilla.kernel.org,
Ayaz Abdulla <aabdulla@...dia.com>
Subject: Re: [Bugme-new] [Bug 11752] New: Extremely low netperf UDP_RR throughput for nvidia MCP65
Rick Jones <rick.jones2@...com> writes:
> Arno J. Klaassen wrote:
> > Hello,
> >
> >>Are netstat stats showing retransmissions during a TCP_STREAM test?
> > some more info :
> > [root@...alhost mcp65]# uname -a
> > Linux localhost.localdomain 2.6.27-0.352.rc7.git1.fc10.x86_64 #1
> > SMP Tue Sep 23 21:13:29 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux
> > [root@...alhost ~]# ifconfig
> > eth0 Link encap:Ethernet HWaddr 00:1E:68:XXX
> > inet addr:172.16.1.31 Bcast:172.16.1.255 Mask:255.255.255.0
> > inet6 addr: XXX/64 Scope:Link UP
> > BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
> > RX packets:1731 errors:149 dropped:0 overruns:0 frame:149
> > TX packets:1628 errors:0 dropped:0 overruns:0 carrier:0
> > collisions:0 txqueuelen:1000
> > RX bytes:2549871 (2.4 MiB) TX bytes:125378 (122.4 KiB)
> > Interrupt:20 Base address:0x6000
> > After some fiddling (essentially installing a netperf-rpm) :
> > [root@...alhost mcp65]# netstat -Ieth0
> > Kernel Interface table
> > Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR
> > TX-DRP TX-OVR Flg
> > eth0 1500 0 6347 508 0 0 5838 0
> > 0 0 BMRU
> > [root@...alhost mcp65]# ethtool eth0
> > Settings for eth0:
> > Supported ports: [ MII ]
> > Supported link modes: 10baseT/Half 10baseT/Full
> > 100baseT/Half 100baseT/Full
> > 1000baseT/Full Supports
> > auto-negotiation: Yes
> > Advertised link modes: 10baseT/Half 10baseT/Full
> > 100baseT/Half 100baseT/Full
> > 1000baseT/Full Advertised
> > auto-negotiation: Yes
> > Speed: 1000Mb/s
> > Duplex: Full
> > Port: MII
> > PHYAD: 1
> > Transceiver: external
> > Auto-negotiation: on
> > Supports Wake-on: g
> > Wake-on: d
> > Link detected: yes
> > [root@...alhost mcp65]# netperf -v -t TCP_STREAM -H 172.16.1.7
> > TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.7 (172.16.1.7) port 0 AF_INET
> > 132.64
>
> Hmm, I'm surprised that the lack of a value following the -v was
> successful - I'll have to go back and look at the code :) Still, I
> guess it gave you the desired "-v 0" behaviour.
>
> > [root@...alhost mcp65]# netstat -Ieth0
> > Kernel Interface table
> > Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVRFlg
> > eth0 1500 0 84682 2933 0 0 127298 0 0 0BMRU
> > I hope this is what you asked for ...
>
> Close enough. I suspect that if you were to snap netstat -s -t before
> and after the netperf you'd have seen retransmissions correlated to
> those "RX-ERR" stats. My history is such that I don't think of
> netstat for link-level stats and only think of it in the context of
> IP-layer and higher (eg tcp).
>
> Clearly something is fubar with the rx side (well duh :). The next
> set of stats I'd try to look at would be ethtool stats for the
> interface, eg ethtool -S eth0 and see if it shows someting more
> specific for the "RX-ERR" shown by netstat -I eth0.
OK, here it is (rx_errors_total: 10049, rx_crc_errors: 10049) :
(NB, let me know how to eventually test eventual patches/binary
modules on a life-CD; I've just limited linux kernel skills)
[root@...alhost ~]# netstat -s -t
Tcp:
16 active connections openings
0 passive connection openings
10 failed connection attempts
0 connection resets received
2 connections established
683 segments received
693 segments send out
4 segments retransmited
0 bad segments received.
14 resets sent
UdpLite:
TcpExt:
7 delayed acks sent
Quick ack mode was activated 3 times
4 packets directly queued to recvmsg prequeue.
2 packets directly received from prequeue
230 packets header predicted
9 acknowledgments not containing data received
47 predicted acknowledgments
2 congestion windows recovered after partial ack
0 TCP data loss events
4 other TCP timeouts
3 DSACKs sent for old packets
4 DSACKs sent for out of order packets
1 connections reset due to unexpected data
IpExt:
InMcastPkts: 14
OutMcastPkts: 16
InBcastPkts: 22
[root@...alhost ~]# ethtool -S eth0
NIC statistics:
tx_bytes: 86812
tx_zero_rexmt: 1057
tx_one_rexmt: 0
tx_many_rexmt: 0
tx_late_collision: 0
tx_fifo_errors: 0
tx_carrier_errors: 0
tx_excess_deferral: 0
tx_retry_error: 0
rx_frame_error: 0
rx_extra_byte: 0
rx_late_collision: 0
rx_runt: 0
rx_frame_too_long: 0
rx_over_errors: 0
rx_crc_errors: 323
rx_frame_align_error: 0
rx_length_error: 0
rx_unicast: 1021
rx_multicast: 0
rx_broadcast: 29
rx_packets: 1050
rx_errors_total: 323
tx_errors_total: 0
tx_deferral: 0
tx_packets: 1057
rx_bytes: 1421807
tx_pause: 0
rx_pause: 0
rx_drop_frame: 0
[root@...alhost ~]# netperf -v 1 -l 60 -H 172.16.1.7 -t TCP_STREAM
TCP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.7 (172.16.1.7) port 0 AF_INET
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec
3217968 16384 16384 60.00 149.06
[root@...alhost ~]# netstat -s -t
Tcp:
18 active connections openings
0 passive connection openings
10 failed connection attempts
0 connection resets received
2 connections established
523674 segments received
820982 segments send out
4 segments retransmited
0 bad segments received.
14 resets sent
UdpLite:
TcpExt:
1 TCP sockets finished time wait in fast timer
7 delayed acks sent
Quick ack mode was activated 15 times
5 packets directly queued to recvmsg prequeue.
2 packets directly received from prequeue
666 packets header predicted
498190 acknowledgments not containing data received
23392 predicted acknowledgments
2 congestion windows recovered after partial ack
0 TCP data loss events
4 other TCP timeouts
15 DSACKs sent for old packets
16 DSACKs sent for out of order packets
1 connections reset due to unexpected data
IpExt:
InMcastPkts: 14
OutMcastPkts: 16
InBcastPkts: 33
[root@...alhost ~]# ethtool -S eth0
NIC statistics:
tx_bytes: 1175487542
tx_zero_rexmt: 821009
tx_one_rexmt: 0
tx_many_rexmt: 0
tx_late_collision: 0
tx_fifo_errors: 0
tx_carrier_errors: 0
tx_excess_deferral: 0
tx_retry_error: 0
rx_frame_error: 0
rx_extra_byte: 0
rx_late_collision: 0
rx_runt: 0
rx_frame_too_long: 0
rx_over_errors: 0
rx_crc_errors: 9301
rx_frame_align_error: 0
rx_length_error: 0
rx_unicast: 523675
rx_multicast: 0
rx_broadcast: 41
rx_packets: 523716
rx_errors_total: 9301
tx_errors_total: 0
tx_deferral: 0
tx_packets: 821009
rx_bytes: 39624285
tx_pause: 0
rx_pause: 0
rx_drop_frame: 0
[root@...alhost ~]# netperf -v 1 -l 60 -H 172.16.1.7 -t TCP_RR
TCP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.7 (172.16.1.7) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
16384 87380 1 1 60.00 350.52
3217968 3217968
[root@...alhost ~]# netstat -s -t
Tcp:
20 active connections openings
0 passive connection openings
10 failed connection attempts
1 connection resets received
2 connections established
545934 segments received
843030 segments send out
226 segments retransmited
0 bad segments received.
15 resets sent
UdpLite:
TcpExt:
3 TCP sockets finished time wait in fast timer
9 delayed acks sent
Quick ack mode was activated 22 times
20941 packets directly queued to recvmsg prequeue.
190 packets directly received from backlog
20725 packets directly received from prequeue
1046 packets header predicted
20913 packets header predicted and directly queued to user
498407 acknowledgments not containing data received
44212 predicted acknowledgments
3 congestion windows recovered after partial ack
0 TCP data loss events
7 timeouts after SACK recovery
219 other TCP timeouts
22 DSACKs sent for old packets
23 DSACKs sent for out of order packets
1 connections reset due to unexpected data
1 connections reset due to early user close
IpExt:
InMcastPkts: 14
OutMcastPkts: 16
InBcastPkts: 40
[root@...alhost ~]# ethtool -S eth0
NIC statistics:
tx_bytes: 1177080452
tx_zero_rexmt: 843341
tx_one_rexmt: 0
tx_many_rexmt: 0
tx_late_collision: 0
tx_fifo_errors: 0
tx_carrier_errors: 0
tx_excess_deferral: 0
tx_retry_error: 0
rx_frame_error: 0
rx_extra_byte: 0
rx_late_collision: 0
rx_runt: 0
rx_frame_too_long: 0
rx_over_errors: 0
rx_crc_errors: 9750
rx_frame_align_error: 0
rx_length_error: 0
rx_unicast: 545997
rx_multicast: 0
rx_broadcast: 50
rx_packets: 546047
rx_errors_total: 9750
tx_errors_total: 0
tx_deferral: 0
tx_packets: 843341
rx_bytes: 42743567
tx_pause: 0
rx_pause: 0
rx_drop_frame: 0
[root@...alhost ~]# netperf -v 1 -l 60 -H 172.16.1.7 -t UDP_RR
UDP REQUEST/RESPONSE TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to 172.16.1.7 (172.16.1.7) port 0 AF_INET
Local /Remote
Socket Size Request Resp. Elapsed Trans.
Send Recv Size Size Time Rate
bytes Bytes bytes bytes secs. per sec
124928 124928 1 1 60.00 5.55
57344 524288
[root@...alhost ~]# netstat -s -t
Tcp:
21 active connections openings
0 passive connection openings
10 failed connection attempts
1 connection resets received
2 connections established
546873 segments received
843968 segments send out
226 segments retransmited
0 bad segments received.
15 resets sent
UdpLite:
TcpExt:
4 TCP sockets finished time wait in fast timer
10 delayed acks sent
Quick ack mode was activated 27 times
20941 packets directly queued to recvmsg prequeue.
190 packets directly received from backlog
20725 packets directly received from prequeue
1323 packets header predicted
20913 packets header predicted and directly queued to user
498409 acknowledgments not containing data received
44213 predicted acknowledgments
3 congestion windows recovered after partial ack
0 TCP data loss events
7 timeouts after SACK recovery
219 other TCP timeouts
27 DSACKs sent for old packets
29 DSACKs sent for out of order packets
1 connections reset due to unexpected data
1 connections reset due to early user close
IpExt:
InMcastPkts: 14
OutMcastPkts: 16
InBcastPkts: 47
[root@...alhost ~]# ethtool -S eth0
NIC statistics:
tx_bytes: 1177171368
tx_zero_rexmt: 844569
tx_one_rexmt: 0
tx_many_rexmt: 0
tx_late_collision: 0
tx_fifo_errors: 0
tx_carrier_errors: 0
tx_excess_deferral: 0
tx_retry_error: 0
rx_frame_error: 0
rx_extra_byte: 0
rx_late_collision: 0
rx_runt: 0
rx_frame_too_long: 0
rx_over_errors: 0
rx_crc_errors: 10049
rx_frame_align_error: 0
rx_length_error: 0
rx_unicast: 547225
rx_multicast: 0
rx_broadcast: 56
rx_packets: 547281
rx_errors_total: 10049
tx_errors_total: 0
tx_deferral: 0
tx_packets: 844569
rx_bytes: 44106473
tx_pause: 0
rx_pause: 0
rx_drop_frame: 0
[root@...alhost ~]#
Arno
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