bhyve: improve memory size documentation

A couple of minor memory size option related nits:

 - use common name 'memsize' (instead of 'max-size' or just 'size')
 - bhyve: update usage with memsize unit suffix, drop legacy "MB"
   unit
 - bhyveload: update usage with memsize unit suffix
 - bhyve(8): document default size
 - bhyveload(8): use memsize formatting like it's done
   in bhyve(8)

Reviewed by:            wblock, grehan
Approved by:            re (kib), wblock, grehan
Differential Revision:  https://reviews.freebsd.org/D6952

2 files changed, 8 insertions, 13 deletions

diff --git a/usr.sbin/bhyveload/bhyveload.8 b/usr.sbin/bhyveload/bhyveload.8
index b566343..519c16b 100644
--- a/usr.sbin/bhyveload/bhyveload.8
+++ b/usr.sbin/bhyveload/bhyveload.8
@@ -25,7 +25,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd February 26, 2016
+.Dd June 24, 2016
 .Dt BHYVELOAD 8
 .Os
 .Sh NAME
@@ -42,7 +42,7 @@ guest inside a bhyve virtual machine
 .Op Fl e Ar name=value
 .Op Fl h Ar host-path
 .Op Fl l Ar os-loader
-.Op Fl m Ar mem-size
+.Op Fl m Ar memsize Ns Op Ar K|k|M|m|G|g|T|t
 .Ar vmname
 .Sh DESCRIPTION
 .Nm
@@ -103,16 +103,12 @@ will use
 which presents a standard
 .Fx
 loader.
-.It Fl m Ar mem-size Xo
-.Sm off
-.Op Cm K | k | M | m | G | g | T | t
-.Xc
-.Sm on
-.Ar mem-size
+.It Fl m Ar memsize Ns Op Ar K|k|M|m|G|g|T|t
+.Ar memsize
 is the amount of memory allocated to the guest.
 .Pp
 The
-.Ar mem-size
+.Ar memsize
 argument may be suffixed with one of
 .Cm K ,
 .Cm M ,
@@ -123,9 +119,8 @@ or
 Kilobytes, Megabytes, Gigabytes or Terabytes
 respectively.
 .Pp
-The default value of
-.Ar mem-size
-is 256M.
+.Ar memsize
+defaults to 256M.
 .It Fl C
 Include guest memory in the core file when
 .Nm
diff --git a/usr.sbin/bhyveload/bhyveload.c b/usr.sbin/bhyveload/bhyveload.c
index 9df680f..c67a2f6 100644
--- a/usr.sbin/bhyveload/bhyveload.c
+++ b/usr.sbin/bhyveload/bhyveload.c
@@ -648,7 +648,7 @@ usage(void)
 
 	fprintf(stderr,
 	    "usage: %s [-S][-c <console-device>] [-d <disk-path>] [-e <name=value>]\n"
-	    "       %*s [-h <host-path>] [-m mem-size] <vmname>\n",
+	    "       %*s [-h <host-path>] [-m memsize[K|k|M|m|G|g|T|t]] <vmname>\n",
 	    progname,
 	    (int)strlen(progname), "");
 	exit(1);