Set max-cache-size expectations for low values

diff --git a/doc/arm/reference.rst b/doc/arm/reference.rst
index 7aea96ea13b1c46d674291a36126390e36e09217..2aab7a6a9d1c45d35ec821652a4d04d970504b4d 100644 (file)
--- a/doc/arm/reference.rst
+++ b/doc/arm/reference.rst
@@ -3772,6 +3772,11 @@ system.
        default value of that option (90% of physical memory for each
        individual cache) may lead to memory exhaustion over time.
 
+   .. note::
+
+       :any:`max-cache-size` does not work reliably for the maximum
+       amount of memory of 100 MB or lower.
+
    Upon startup and reconfiguration, caches with a limited size
    preallocate a small amount of memory (less than 1% of
    :any:`max-cache-size` for a given view). This preallocation serves as an