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Subjectne2k-pci uncorrectly detecting collisions ?
Hello,

I have experienced problem with the ne2k-pci driver. The symptoms were
extremly poor performance with TCP. After some investigations, I believe
it might be caused by problems with detecting collisions.

I tested with 3 cards :
- eth1 : RTL8029 - not working properly
the chip says RTL8029, but lspci says RTL8029(AS)
- eth2 : RTL8029AS - working.
- eth3 : RTL8029AS - not working properly
lspci for all three cards :
00:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)

The same problem was experienced on FreeBSD, but it hurts a lot to say
that there wasn't any problem when I tested under Windows - so it's
probably not a broken card problem.

All 3 NICs were in the same box, using the same ne2k-pci driver compiled
as a module (kernel version is 2.4.24). They used the same 10/100 Hub to
talk to the same NIC on the other end. Traffic on the network during the
test was quite low but not nonexistent.

As you can see :
- throughput for eth1 and eth3 with TCP is extremly low.
- throughput with UDP is normal.
- eth1 and eth3 saw no collisions, but eth2 saw a lot.
- eth1 and eth3 saw lots of frame errors, but eth2 saw much less.

Here are the detailed test results. I can provide more results if needed.
+ ifconfig eth1 down
+ ifconfig eth2 down
+ ifconfig eth3 down
+ rmmod ne2k-pci
+ modprobe ne2k-pci
+ ifconfig eth1 172.36.1.2
+ ifconfig eth2 172.37.1.2
+ ifconfig eth3 172.38.1.2
+ netperf -H 172.36.1.1 -l 20
TCP STREAM TEST to 172.36.1.1
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

87380 16384 16384 20.18 0.59
+ netperf -H 172.37.1.1 -l 20
TCP STREAM TEST to 172.37.1.1
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

87380 16384 16384 20.04 8.54
+ netperf -H 172.38.1.1 -l 20
TCP STREAM TEST to 172.38.1.1
Recv Send Send
Socket Socket Message Elapsed
Size Size Size Time Throughput
bytes bytes bytes secs. 10^6bits/sec

87380 16384 16384 20.05 0.56
+ netperf -t UDP_STREAM -H 172.36.1.1 -l 20 -- -m 1472
UDP UNIDIRECTIONAL SEND TEST to 172.36.1.1
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec

65535 1472 20.00 16027 0 9.44
65535 20.00 15216 8.96

+ netperf -t UDP_STREAM -H 172.37.1.1 -l 20 -- -m 1472
UDP UNIDIRECTIONAL SEND TEST to 172.37.1.1
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec

65535 1472 19.99 15326 0 9.03
65535 19.99 15326 9.03

+ netperf -t UDP_STREAM -H 172.38.1.1 -l 20 -- -m 1472
UDP UNIDIRECTIONAL SEND TEST to 172.38.1.1
Socket Message Elapsed Messages
Size Size Time Okay Errors Throughput
bytes bytes secs # # 10^6bits/sec

65535 1472 20.00 16008 0 9.43
65535 20.00 15593 9.18

+ netstat -i
Table d'interfaces noyau
Iface MTU Met RX-OK RX-ERR RX-DRP RX-OVR TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0 1500 0 140926 0 0 0 232637 0 0 0 BMRU
eth1 1500 0 1049 0 0 0 17292 0 0 0 BMRU
eth2 1500 0 7421 0 0 0 30134 0 0 0 BMRU
eth3 1500 0 982 0 0 0 17201 0 0 0 BMRU
lo 16436 0 22831 0 0 0 22831 0 0 0 LRU
+ ifconfig eth1
eth1 Lien encap:Ethernet HWaddr 00:00:E8:D7:E9:46
inet adr:172.36.1.2 Bcast:172.36.255.255 Masque:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:1049 errors:0 dropped:0 overruns:0 frame:165
TX packets:17292 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
RX bytes:75796 (74.0 KiB) TX bytes:26148738 (24.9 MiB)
Interruption:5 Adresse de base:0xd800

+ ifconfig eth2
eth2 Lien encap:Ethernet HWaddr 00:E0:7D:75:C2:D7
inet adr:172.37.1.2 Bcast:172.37.255.255 Masque:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:7421 errors:0 dropped:0 overruns:0 frame:27
TX packets:30134 errors:0 dropped:0 overruns:0 carrier:0
collisions:225 lg file transmission:1000
RX bytes:491544 (480.0 KiB) TX bytes:45590838 (43.4 MiB)
Interruption:9 Adresse de base:0xdc00

+ ifconfig eth3
eth3 Lien encap:Ethernet HWaddr 00:00:E8:74:0E:1A
inet adr:172.38.1.2 Bcast:172.38.255.255 Masque:255.255.0.0
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:982 errors:0 dropped:0 overruns:0 frame:147
TX packets:17201 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 lg file transmission:1000
RX bytes:71062 (69.3 KiB) TX bytes:26010052 (24.8 MiB)
Interruption:11 Adresse de base:0xe000

Thank you,
--
| Lucas Nussbaum
| lucas@lucas-nussbaum.net lnu@gnu.org GPG: 1024D/023B3F4F |
| jabber: lucas@linux.ensimag.fr http://www.lucas-nussbaum.net |
| fingerprint: 075D 010B 80C3 AC68 BD4F B328 DA19 6237 023B 3F4F |
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