--- wikisrc/ports/xen/howto.mdwn	2015/02/10 17:38:14	1.88
+++ wikisrc/ports/xen/howto.mdwn	2015/03/04 01:27:58	1.89
@@ -142,6 +142,18 @@ running an i386 NetBSD kernel as a domU,
 (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.)
 
+Stability
+---------
+
+Mostly, NetBSD as a dom0 or domU is quite stable.
+However, there are some open PRs indicating problems.
+
+ - http://gnats.netbsd.org/48125
+ - http://gnats.netbsd.org/47720
+
+Note also that there are issues with sparse vnd(4) instances, but
+these are not about Xen.
+
 Recommendation
 --------------
 
@@ -636,6 +648,10 @@ create an empty 4G virtual disk, simply 
 
         dd if=/dev/zero of=foo-xbd0 bs=1m count=4096
 
+Do not use qemu-img-xen, because this will create sparse file.  There
+have been recent (2015) reports of sparse vnd(4) devices causing
+lockups, but there is apparently no PR.
+
 With the lvm style, one creates logical devices.  They are then used
 similarly to vnds.  TODO: Add an example with lvm.