Add rctl limits to the manpage

lib/vm-rctl

@@ -56,9 +56,11 @@ __vm_set_rctl_limits(){
     [ ${_exit} -ne 0 ] && \
         __log "guest" "${_name}" "RCTL support requested but RCTL not available" && return 1
 
+    __log "guest" "${_name}" "applying rctl limits"
+
     if [ -n "${_pcpu}" ]; then
         /usr/bin/rctl -a process:${_pid}:pcpu:deny=${_pcpu}
-        __log "guest" "${_name}" "limit rctl pcpu resource to ${_pcpu}"
+        __log "guest" "${_name}" " pcpu=${_pcpu}"
     fi
 
     # at this point we can return if < FreeBSD 11
@@ -66,21 +68,21 @@ __vm_set_rctl_limits(){
 
     if [ -n "${_rbps}" ]; then
         /usr/bin/rctl -a process:${_pid}:readbps:throttle=${_rbps}
-        __log "guest" "limit rctl readbps resource to ${_rbps}"
+        __log "guest" " readbps=${_rbps}"
     fi
 
     if [ -n "${_wbps}" ]; then
         /usr/bin/rctl -a process:${_pid}:writebps:throttle=${_wbps}
-        __log "guest" "limit rctl writebps resource to ${_wbps}"
+        __log "guest" " writebps=${_wbps}"
     fi
 
     if [ -n "${_riops}" ]; then
         /usr/bin/rctl -a process:${_pid}:readiops:throttle=${_riops}
-        __log "guest" "limit rctl readiops resource to ${_riops}"
+        __log "guest" " readiops=${_riops}"
     fi
 
     if [ -n "${_wiops}" ]; then
         /usr/bin/rctl -a process:${_pid}:writeiops:throttle=${_wiops}
-        __log "guest" "limit rctl writeiops resource to ${_wiops}"
+        __log "guest" " writeiops=${_wiops}"
     fi
 }

vm.8

@@ -932,6 +932,22 @@ Multiple properties can be specified, separated by a space. For example, the fol
 will configure the ZVOL block size to 128k, and turn compression off.
 .Pp
 zfs_zvol_opts="volblocksize=128k compress=off"
+.It limit_pcpu
+Limit the bhyve process to the specified cpu percentage.
+.Pp
+Please note this, as with all 
+.Sy limit
+settings, requires
+.Xr rctl 8
+to be enabled in your kernel.
+.It limit_rbps
+Limit guest disk read throughput to the specified bits per second.
+.It limit_wbps
+Limit guest disk write throughput to the specified bits per second.
+.It limit_riops
+Limit guest disk read iops to the specified number of operations per second.
+.It limit_wiops
+Limit guest disk write iops to the specified number of operations per second.
 .El
 .\" ============ SEE ALSO =============
 .Sh SEE ALSO
@@ -944,7 +960,8 @@ zfs_zvol_opts="volblocksize=128k compress=off"
 .Xr cu 1 ,
 .Xr fetch 1 ,
 .Xr truncate 1 ,
-.Xr zfs 8
+.Xr zfs 8 ,
+.Xy rctl 8
 .\" ============ BUGS =============
 .Sh BUGS
 Please report all bugs/issues/feature requests to the github project at