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-rw-r--r--sys/boot/common/help.common18
1 files changed, 18 insertions, 0 deletions
diff --git a/sys/boot/common/help.common b/sys/boot/common/help.common
index e467b1c..98d21e1 100644
--- a/sys/boot/common/help.common
+++ b/sys/boot/common/help.common
@@ -203,6 +203,24 @@
$rootdev explicitly.
################################################################################
+# Tset Stunables DSet kernel tunable values
+
+ Various kernel tunable parameters can be overriden by specifying new
+ values in the environment.
+
+ set kern.ipc.nmbclusters=<value> NMBCLUSTERS
+
+ Set the number of mbuf clusters to be allocated. The value
+ cannot be set below the default determined when the kernel
+ was compiled.
+
+ set kern.vm.kmem.size=<value> VM_KMEM_SIZE
+
+ Sets the size of kernel memory (bytes). This overrides
+ completely the value determined when the kernel was
+ compiled.
+
+################################################################################
# Tshow DShow the values of variables
show [<variable>]
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