--- wikisrc/ports/xen/howto.mdwn	2014/12/24 00:06:31	1.17
+++ wikisrc/ports/xen/howto.mdwn	2014/12/24 00:11:15	1.18
@@ -91,11 +91,23 @@ no SMP support for NetBSD as dom0.  (The
 need SMP; the lack of support is really a problem when using a dom0 as
 a normal computer.)
 
+Architecture
+------------
+
+Xen is basically amd64 only at this point.  One can either run i386
+domains or amd64 domains.  If running i386, PAE versions are required,
+for both dom0 and domU.  These versions are built by default in NetBSD
+releases.  While i386 dom0 works fine, amd64 is recommended as more
+normal.  (Note that emacs (at least) fails if run on i386 with PAE when
+built without, and vice versa, presumably due to bugs in the undump
+code.)
+
 Recommendation
 --------------
 
-Therefore, this HOWTO recommends running xenkernel42 (and xentools42)
-and NetBSD 6 stable branch.
+Therefore, this HOWTO recommends running xenkernel42 (and xentools42),
+the NetBSD 6 stable branch, and to use amd64 as the dom0.  Either the
+i386 or amd64 of NetBSD may be used as domUs.
 
 NetBSD as a dom0
 ================
@@ -449,7 +461,7 @@ working vif-bridge is also provided with
 
     #!/bin/sh
     #============================================================================
-    # $NetBSD: howto.mdwn,v 1.16 2014/12/24 00:06:01 gdt Exp $
+    # $NetBSD: howto.mdwn,v 1.17 2014/12/24 00:06:31 gdt Exp $
     #
     # /usr/pkg/etc/xen/vif-bridge
     #