document ballooning for fixed memory size

[pve-docs.git] / qm.adoc

diff --git a/qm.adoc b/qm.adoc
index 85b939ade2b486f1c346e6432b8dcd1aeb177ea5..68d7bad9214e640eccc0becf5b8ff10ec202fbd8 100644 (file)
--- a/qm.adoc
+++ b/qm.adoc
@@ -275,6 +275,17 @@ host.
 When choosing a *fixed size memory* {pve} will simply allocate what you
 specify to your VM.
 
+Even when using a fixed memory size, the ballooning device gets added to the
+VM, because it delivers useful information such as how much memory the guest
+really uses.
+In general, you should leave *ballooning* enabled, but if you want to disable
+it (e.g. for debugging porpuses), simply uncheck
+*Ballooning* or set
+
+ balloon: 0
+
+in the configuration.
+
 .Automatic Memory Allocation
 [thumbnail="gui-create-vm-memory-dynamic.png", float="left"]