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, from the processor core, a load-type request at a lower level cache memory, allocating an entry among a plurality of entries in a request queue of a core interface unit (CIU) in the lower level cache memory to the load-type request; the CIU detecting contention for at least one of 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, the CIU suspending issuance of the load-type request from the entry of the request queue until the contention is resolved; in response to the contention being between the load-type request and a store queue entry: dynamically tracking processing of the store queue entry; determining whether the store queue entry has been dispatched to a read claim (RC) machine of the lower level cache memory; in response to determining that the store queue entry has been dispatched to an RC machine, the CIU determining the specific RC machine to which the store queue entry has been dispatched and tracking the specific RC machine; and in response to removal of the contention, terminating tracking of the specific RC machine if the contention was between the load-type request and a store queue entry and issuing the load-type request from the request queue for processing by the lower level cache memory.