While writing the MQTT test for ENTMQ-1762, I noticed that the number of messages that get enqueued is about half or even less of what one might expect, given the max-size-bytes setting and message size.

I am sending messages of 1KiB in size and I am setting the max size to be capacity-times of that. So I'd expect to enqueue and then receive capacity messages, possibly a bit less. But in fact, the table looks like this:

capacity: 4 received: 2
capacity: 8 received: 4
capacity: 16 received: 7
capacity: 32 received: 13
capacity: 64 received: 26
capacity: 128 received: 52
capacity: 256 received: 104
capacity: 512 received: 207

Is this correct behavior?