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From: balu@dva.in-berlin.de (Boris Staeblow)
Subject: Very slow Ethernet-performance with de0
To: current@freebsd.org
Date: Thu, 14 Aug 1997 15:46:54 +0200 (CEST)
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I've big problems with performance on my local network.
Both machines (P166/P200 MMX, 430 HX) running (very) current (as of Aug 13)
 - same DEC21041 based network cards. No special kernel-configs.

host1:
------
de0: <Digital 21041 Ethernet> rev 0x11 int a irq 9 on pci0.10.0
de0: 21041 [10Mb/s] pass 1.1
de0: address 00:80:ad:1c:af:a8

de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 10.0.0.10 netmask 0xffffff00 broadcast 10.0.0.255
        ether 00:80:ad:1c:af:a8 
        media: autoselect (10base2/BNC) status: active

host2:
------

de0: <Digital 21041 Ethernet> rev 0x11 int a irq 11 on pci0.13.0
de0: 21041 [10Mb/s] pass 1.1
de0: address 00:80:ad:1c:ac:97

de0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500
        inet 10.0.0.11 netmask 0xffffff00 broadcast 10.0.0.255
        ether 00:80:ad:1c:ac:97 
        media: autoselect (10base2/BNC) status: active


benchmark on a NFS-mounted drive:

% iozone 10

Writing the 10 Megabyte file, 'iozone.tmp'...16.531250 seconds 
Reading the file...55.671875 seconds

IOZONE performance measurements:
        634299 bytes/second for writing the file 
        188349 bytes/second for reading the file
    
ftp-benchmark:

ncftp>mget test.tgz
Receiving file: test.tgz
100%  0                                               2576406 bytes. ETA:  0:00
test.tgz: 2576406 bytes received in 157.45 seconds, 15.98 K/s.
                                                    ^^^^^^^^^

telnet:

When i cat a large ascii-file in a telnet session the transfer stops
sometimes for 1-2 secs.

ping-test:

% ping -c 100000 -f host2
PING host2 (10.0.0.11): 56 data bytes
.....................
--- host2 ping statistics ---
100020 packets transmitted, 100000 packets received, 0% packet loss
round-trip min/avg/max/stddev = 0.294/0.520/17.794/0.300 ms

(seems to be OK)

- cable + termination is 100% ok
- Filetransfers with Windows 95 on both sides are perfecly fast.
- There's no additional network load (tested with tcpdump)
- This performance problem exist since serval months

Can someone give me a hint? Anyone with similar problems?

Boris

-- 
balu@dva.in-berlin.de
   Boris Staeblow