This read-create Integer32 (64..9600) defines the average frame size assumed for accounting purposes when metering or shaping traffic on a version-2 QoS shaper. Administrators tune it because shaping calculations that convert bit rates into per-frame scheduling decisions depend on an assumed frame size, and mismatched assumptions can make a shaper enforce a rate less accurately than intended. For example, on a shaper serving mostly jumbo-frame storage traffic, setting this value near 9000 rather than a default around 512 gives the shaper's rate accounting a more realistic basis.