--- etc/defaults/rc.conf	2008-06-03 16:45:22.000000000 +0200
+++ etc/defaults/rc.conf	2008-06-03 20:44:39.000000000 +0200
@@ -605,6 +605,7 @@ 
 #jail_example_devfs_ruleset="ruleset_name"	# devfs ruleset to apply to jail
 #jail_example_fstab=""				# fstab(5) for mount/umount
 #jail_example_flags="-l -U root"		# flags for jail(8)
+#jail_example_nice="5"				# nice(1) for jail execution
 
 ##############################################################
 ### Define source_rc_confs, the mechanism used by /etc/rc.* ##
--- etc/rc.d/jail	2008-05-29 00:21:09.000000000 +0200
+++ etc/rc.d/jail	2008-06-03 21:03:55.000000000 +0200
@@ -83,6 +83,7 @@ 
 	[ -z "${_flags}" ] && _flags="-l -U root"
 	eval _consolelog=\"\${jail_${_j}_consolelog:-${jail_consolelog}}\"
 	[ -z "${_consolelog}" ] && _consolelog="/var/log/jail_${_j}_console.log"
+	eval _nice=\"\${jail_${_j}_nice:-${jail_nice}}\"
 
 	# Debugging aid
 	#
@@ -117,6 +118,7 @@ 
 	debug "$_j exec stop: $_exec_stop"
 	debug "$_j flags: $_flags"
 	debug "$_j consolelog: $_consolelog"
+	debug "$_j nice: $_nice"
 
 	if [ -z "${_hostname}" ]; then
 		err 3 "$name: No hostname has been defined for ${_j}"
@@ -350,7 +352,14 @@ 
 			fi
 		fi
 		_tmp_jail=${_tmp_dir}/jail.$$
-		eval jail ${_flags} -i ${_rootdir} ${_hostname} \
+
+		if [ -z "${_nice}" ]; then 
+			_nice_cmd=""
+		else
+			_nice_cmd="nice -n ${_nice}"
+		fi
+
+		eval ${_nice_cmd} jail ${_flags} -i ${_rootdir} ${_hostname} \
 			${_ip} ${_exec_start} > ${_tmp_jail} 2>&1
 
 		if [ "$?" -eq 0 ] ; then
--- usr/src/share/man/man5/rc.conf.5	2008-06-03 20:47:19.000000000 +0200
+++ usr/src/share/man/man5/rc.conf.5	2008-06-03 20:35:26.000000000 +0200
@@ -3312,6 +3312,13 @@ 
 .Va jail_ Ns Ao Ar jname Ac Ns Va _exec_stop
 for every jail in
 .Va jail_list .
+.It Va jail_nice
+.Pq Vt int
+Unset by default.
+When set, use as default value for
+.Va jail_ Ns Ao Ar jname Ac Ns Va _nice
+for every jail in
+.Va jail_list .
 .It Va jail_ Ns Ao Ar jname Ac Ns Va _rootdir
 .Pq Vt str
 Unset by default.
@@ -3412,6 +3419,11 @@ 
 .Dq Li /bin/sh /etc/rc.shutdown
 by default.
 This is the command executed at jail shutdown.
+.It Va jail_ Ns Ao Ar jname Ac Ns Va _nice
+.Pq Vt int
+Unset by default.
+When set, sets the nice value to alter priority of processes in jail.
+The higher the nice value the lower its scheduling priority.
 .It Va jail_set_hostname_allow
 .Pq Vt bool
 If set to