1. A method of data processing in a processing unit, including a processor core, an upper level cache memory, and a lower level cache memory, the method comprising: in response to receiving a load-type request issued of the processor core at the lower level cache memory, allocating an entry among a plurality of entries in a request queue of the lower level cache memory to the load-type request; detecting contention for one or more resources between the load-type request and another memory access request in the processing unit; in response to detecting contention for at least one of the one or more resources, suspending issuance of the load-type request from the entry of the request queue until the contention is resolved; and in response to removal of the contention, issuing the load-type request from the request queue for processing by the lower level cache memory.