--- wikisrc/zfs.mdwn	2020/03/02 20:50:56	1.25
+++ wikisrc/zfs.mdwn	2020/06/24 15:19:56	1.26
@@ -198,6 +198,11 @@ is cleanly enough.
 For now, a good guess is that a 4G system with only 1T of disk is
 probably ok, and that 1G is very likely not ok.
 
+Besides RAM, zfs requires that architecture kernel stack size is at least 12KB or more - some
+operations cause stack overflow with 8KB kernel stack. On NetBSD, the architectures
+with 16KB kernel stack are amd64, sparc64, powerpc, and experimental ia64, hppa. mac68k and sh3 have 12KB kernel
+stack. All others use only 8KB stack, which is not enough to run zfs.
+
 FreeBSD has some documentation about memory use.  There is a notion of
 a minimum of 1G (used for ZFS), and using 1G for 1T of storage, and
 more if deduplication is enabled.  FreeBSD considers all i386 systems