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Date: Mon, 24 May 1999 04:53:08 -0700 (PDT)
From: delaitt@cpc.wmin.ac.uk
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Subject: kern/11869: Network hangging due to xl0: tx underrun 
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>Number:         11869
>Category:       kern
>Synopsis:       Network hangging due to xl0: tx underrun
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon May 24 05:00:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Thierry Delaitre
>Release:        3.2-19990522-STABLE
>Organization:
Centre for Parallel Computing
>Environment:
FreeBSD seth.cpc.wmin.ac.uk 3.2-19990522-STABLE FreeBSD 3.2-19990522-STABLE #1: Sun May 23 13:19:23 BST 1999     root@gnu.cpc.wmin.ac.uk:/usr/src/sys/compile/SETH  i386
>Description:
The problem is that I keep geeting the following messages:

xl0: transmission error: 90
xl0: tx underrun, increasing tx start threshold to 120 bytes

and sometimes the network hangs and I have to reboot the machine.
The FreeBSD PC is mounting some NFS volumes and I get these messages
when I write a large file over NFS.

I'm using the following Ethernet Card:

xl0: <3Com 3c905-TX Fast Etherlink XL> rev 0x00 int a irq 17 on pci0.11.0
xl0: Ethernet address: 00:60:97:b8:65:cf
xl0: autoneg complete, link status good (full-duplex, 100Mbps)


>How-To-Repeat:
Write large files over NFS mounted volumes.

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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