3Com 3c509 dropping packets

3Com 3c509 dropping packets

Post by Tim Be » Sun, 26 Jan 1997 04:00:00

I have a 3Com Etherlink III card (3C509B-COMBO) which has just recently
started dropping selected packets. This only seems to happen with packets
which are 422 bytes or larger. For instance, flood pinging a nearby machine:

  cuiv ~# ping -f -s413 frank
  PING frank.trinity.unimelb.edu.au ( 413 data bytes
  --- frank.trinity.unimelb.edu.au ping statistics ---
  637 packets transmitted, 636 packets received, 0% packet loss
  round-trip min/avg/max = 1.9/2.8/6.2 ms

(No problems with 421 byte packets, but with 422...)

  cuiv ~# ping -f -s414 frank
  PING frank.trinity.unimelb.edu.au ( 414 data bytes
  --- frank.trinity.unimelb.edu.au ping statistics ---
  489 packets transmitted, 379 packets received, 22% packet loss
  round-trip min/avg/max = 2.1/2.7/5.2 ms

ifconfig gives:

  eth0      Link encap:10Mbps Ethernet  HWaddr 00:A0:24:06:E0:DA
            inet addr:  Bcast:  Mask:
            UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
            RX packets:7928 errors:235 dropped:235 overruns:0
            TX packets:6811 errors:0 dropped:0 overruns:0
            Interrupt:10 Base address:0x300

I'm using Donald Becker's driver, version 3c509.c:1.07 6/15/95, with
kernel 2.0.18 (RedHat 4.0) on a 100MHz 486.

The interesting thing is that this problem has started only recently, and
I haven't made any changes to the system, hardware or software. The DOS
diagnostic utilities which come with the card find no fault (for the Group
1 tests, the only ones I was able to run).

Any leads on what might be causing this (and how to fix it...) would be
much appreciated.


Tim Bell                                      .--_|\

Department of Computer Science               \_.--._/
University of Melbourne, Australia                 v


1. 3COM 3C905b-tx NIC, dropping packets and incorrect IRQ


I figured as long as I saw some posts about the 3c90x series of NIC's, I thought that I would check and see if I could get my problem
When I install linux fresh, my ethernet adapter gets detected fine no problem...bootp identifies my IP, and other information
(different from that in windows...but that is no big deal)  The problem is that I get about 3.5k/s to the redhat mirror site on my
campus (mirror.clarkson.edu).  When I am in windows, I get around 7-800 k/s from this server.  Right now I am running redhat 6.0
(kernel: 2.2.7) on an PII 400 Tyan S1832dl board.  I have tried to do the following to troubleshoot this:
Disable USB support in my bios (because when I boot the machine, the nic is assigned IRQ: 9, but /proc/interrupts says that eth0=IRQ
19?!?!  For other hardware I have: Monster 3DII accelerator, DXR2 DVD decoder card, Syquest 1 gig sparq drive, maxtor 11GB HD, Creative
Labs DVD encore drive, and an AWE64 (which I must say works PERFECT w/ RedHat!!!)

I hope that someone out there has some experiance and can help me out...TIA
David Blado

http://town.newbury.nh.us (Newbury, NH Web Site)

ICQ UIN#:      821651
ICQ NickName:  David


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