Policy entry queue memory limit question

[Gunawan, Rahman (GSFC-703.H)[BUSINESS INTEGRA, INC.]]

When I have configuration like "<policyEntry queue=">" 
producerFlowControl="true" memoryLimit="1mb">", does it mean each queues will 
take up to total of 1 MB of messages before it starts blocking producer 
messages?

Thanks

Regards,
Rahman