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AssigneeInternational Business Machines Corporation
InventorsWilliam E. Hammer, Walter H. Schwane, Frederick J. Ziecina
Estimating the term…
The flow of work requests in a server driven process to process communication environment is described. Logical connections between processes and bus managers interfacing bus units to an I/O bus are assigned to connection groups for management by the bus managers. Each bus unit has its own connection groups for the logical connections. Bus unit resources are assigned to each connection group based on performance factors, and a series of bus unit messages are used to control the flow of work so that a group which has no more resources will not accept further work requests. The originator of the work requests will resequence rejected work requests and resend them when the connection group has freed up resources. A further mechanism is provided to facilitate work consistent with the server driven architecture when bus units do not have adequate DMA capabilities. Two ways of reversing control of transfer of work requests and data so that the server need not have master DMA capability are presented. Management of storage in a remote processor is used to transfer work and its associated data into storage accessible by a bus unit with slave DMA capability. The slave DMA bus unit then transfers the information into storage is manages. In another way of reversing the flow, a bus unit message is used to make the original server a requestor. The bus unit message contains information which varies the request sent by the requestor. In this manner, the server, which was the original requestor transfers information using its master DMA capability flow.
A first bus unit, having master DMA capability, for coupling to a bus, which is coupled to a second bus unit which has only slave DMA capability, the first bus unit comprising:
A first bus unit, having master DMA capability for coupling to a bus, which is coupled to a second bus unit with only slave DMA capability and having a processing and storage, the first bus unit comprising:
A storage management mechanism in a multiprocessor computer system comprising:
A method of controlling data transfer associated with work in a server driven process to process communication computer system wherein a first bus unit has only slave DMA capability and a main storage, and a second bus unit has master DMA capability and a main storage, the method comprising the steps of:
A storage management mechanism in a multiprocessor computer system comprising:
A first bus unit, having master DMA capability, for coupling to a bus, which is coupled to a second bus unit with only slave DMA capability and having a processor and storage, the first bus unit comprising:
A bus management mechanism in a computer system comprising:
Dependencies are inferred from the claim text.