>>         are there anything that has to be done to run NetBSD 1.6E/i386
>>         with 4G memory?  my colleague says that it goes to DDB from UVM
>>         (yes, i need to get backtrace).
>Decrease BUFPAGES down to a sane number.  I use
>options BUFPAGES=0x1000

	could we somehow automate this?  like below (not sure if it is
	entirely correct, since i'm touching MI code):

itojun


Index: kern_allocsys.c
===================================================================
RCS file: /cvsroot/syssrc/sys/kern/kern_allocsys.c,v
retrieving revision 1.18
diff -u -r1.18 kern_allocsys.c
--- kern_allocsys.c	2001/11/12 15:25:05	1.18
+++ kern_allocsys.c	2002/08/20 22:17:12
@@ -171,7 +171,6 @@
 				panic("bufcache is out of range (%d)\n",
 				    bufcache);
 			bufpages = physmem / 100 * bufcache;
-
 		} else {
 			if (physmem < btoc(2 * 1024 * 1024))
 				bufpages = physmem / 10;
@@ -180,6 +179,12 @@
 				    20;
 		}
 	}
+
+	/*
+	 * don't try to use way too much BUFPAGES
+	 */
+	if (bufpages > 0x1000)
+		bufpages = 0x1000;
 
 #ifdef DIAGNOSTIC
 	if (bufpages == 0)