Bug 13752

 
 	Here is a piece of /var/log/messages:
 
 Sep 13 14:03:26 fw /kernel: tl0: adapter check: 180005
 Sep 13 14:06:42 fw /kernel: tl0: adapter check: 180005
 Sep 13 14:07:37 fw /kernel: tl0: adapter check: 180005
 Sep 13 14:08:19 fw /kernel: xl1: transmission error: 90
 Sep 13 14:08:19 fw /kernel: xl1: tx underrun, increasing tx start threshold to 1 20 bytes
 Sep 13 14:37:49 fw /kernel: tl0: adapter check: 180005
 Sep 13 14:39:20 fw /kernel: tl0: adapter check: 180005
 Sep 13 14:40:22 fw /kernel: tl0: adapter check: 180005
 
 	I could not find any reference (web/news-groups) to
 	"adapter check: " message. The server rebooted itself a few times.
 	I seem to be able to get rid of underruns by increasing
 	XL_MIN_FRAMELEN from 60 to 300 in /usr/src/sys/pci/if_xlreg.h
 	Reboots did not happen since than, but "adapter check: " messages
 	persist.
 
 	Here are versions of driver source files:
 # grep Id if_[tx]l*
 if_tl.c: *      $Id: if_tl.c,v 1.24.2.5 1999/05/06 15:39:38 wpaul Exp $
 if_tlreg.h: *   $Id: if_tlreg.h,v 1.7.2.2 1999/03/31 04:12:29 wpaul Exp $
 if_xl.c: *      $Id: if_xl.c,v 1.22.2.12 1999/05/05 17:10:48 wpaul Exp $
 if_xlreg.h: *   $Id: if_xlreg.h,v 1.9.2.6 1999/05/05 17:10:49 wpaul Exp $

How-To-Repeat:  
 	My guess is that peaks of network traffic cause the problem to show,
 	but I do not really know.