kern/73145: severe network slowdown with DEC 21140 network card

[Zach Dykstra]

>Number:         73145
>Category:       kern
>Synopsis:       severe network slowdown with DEC 21140 network card
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Oct 26 02:20:30 GMT 2004
>Closed-Date:
>Last-Modified:
>Originator:     Zach Dykstra
>Release:        5.3-RC1
>Organization:
>Environment:
FreeBSD anarion.lan.duplex 5.3-RC1 FreeBSD 5.3-RC1 #0 Sun Oct 17 01:25:37 UTC 2004 root at wv1u.samsco.home:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
I recently installed 5.3-RC1 from the available ISO.  The machine in question has a DEC 21140 network card (de0), two processors on a 440bx motherboard, an nvidia video card, and an aureal sound card.  After roughly two minutes of use; I started a build for cvsup-without-gui. A few minutes later, I noticed my download speeds dropping rapidly, till I was downloading at a few hundred bytes/sec.  I then killed the build, and pinged a machine on my local 100mbit lan.  Below is the ping print:

%ping 192.168.0.2
PING 192.168.0.2 (192.168.0.2): 56 data bytes
64 bytes from 192.168.0.2: icmp_seq=0 ttl=64 time=5189.516 ms
64 bytes from 192.168.0.2: icmp_seq=1 ttl=64 time=4301.030 ms
64 bytes from 192.168.0.2: icmp_seq=2 ttl=64 time=4040.500 ms
64 bytes from 192.168.0.2: icmp_seq=3 ttl=64 time=4038.426 ms
64 bytes from 192.168.0.2: icmp_seq=4 ttl=64 time=5050.145 ms
64 bytes from 192.168.0.2: icmp_seq=5 ttl=64 time=5050.306 ms
^C
--- 192.168.0.2 ping statistics ---
11 packets transmitted, 6 packets recieved, 45% packet loss

The above conditions are with a machine booting a stock kernel.  I have another machine running 5.3-RC1, and it also has a DEC 21140 based ethernet board. I have yet to experience any network slowdowns on that machine. 
>How-To-Repeat:
SMP, 440BX chipset, DEC 21140 ethernet controller card, pray? 
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted: