kern/15542: de suddenly stops working

[Michael Glasgow]

The following reply was made to PR kern/15542; it has been noted by GNATS.

From: Michael Glasgow <glasgow at beer.net>
To: bug-followup at FreeBSD.org, ap at bnc.net
Cc:  
Subject: Re: kern/15542: de suddenly stops working
Date: Mon, 20 Jun 2005 13:33:27 -0500 (CDT)

 I'm seeing similar behavior on 5.1-RELEASE-p7, with a quad-port
 (ZNYX ZX34X 21140A [10-100Mb/s] pass 2.2) using the de driver.
 
 For me, it's not repeatable, but I'll see the occasional message
 like this:
 
 May  2 13:59:06 hostname kernel: de1: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
 May  4 20:49:32 hostname kernel: de3: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
 May  5 00:12:27 hostname kernel: de1: abnormal interrupt: transmit underflow (raising TX threshold to 128|512)
 May  5 01:08:24 hostname kernel: de2: abnormal interrupt: transmit underflow (raising TX threshold to 96|256)
 
 And only occasionally (rarely) does the NIC lock up and stop sending
 or receiving packets.  Often there is some time between the last of
 these messages and when the NIC stops working, for example the last
 lockup happened approx 17-Jun-05 22:00, but nothing was logged after
 the message on May 5 above.