Method and apparatus for network communication card memory management

• US 20040019652A1
• Filed: 07/25/2002
• Published: 01/29/2004
• Est. Priority Date: 07/25/2002
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Tracey, John Michael, Sahu, Sambit, Pradhan, Prashant, Mraz, Ronald, Nahum, Erich M., Freimuth, Douglas
• Granted Patent: US 6,968,358 B2
• Time in Patent Office: Days
• US Class Current: 709/213
• CPC Class Codes: G06F 9/544 Buffers; Shared memory; Pipes

Abstract

A method, apparatus, and computer instructions for transferring data objects. A request for a data object is received at a communication adapter. A determination is made as to whether the data object is stored in a memory in the communication adapter in response to receiving the request. The data object is transferred from the memory to a receiver of the data object through the communication adapter in which transfer of the data across a bus connecting the communication adapter to the data processing system is unnecessary in response to the data object being present in the memory.

Claims

1. A method in a data processing system for transferring data objects, the method comprising the data processing system implemented steps of:

receiving a request for a data object at a communication adapter;

responsive to receiving the request, determining whether the data object is stored in a memory in the communication adapter; and

responsive to the data object being present in the memory, transferring the data object from the memory to a receiver of the data object through the communication adapter, wherein transfer of the data across a bus connecting the communication adapter to the data processing system is unnecessary.

2. The method of claim 1 further comprising:

responsive to the data object being absent in the memory, transferring the data object across the bus from a storage device to the memory;

transferring the data object from the memory to the receiver through the communication adapter; and

retaining the data object in the memory for use in responding to subsequent requests for the data object.

3. The method of claim 1 further comprising:

responsive to the data object being absent in the memory, transferring the data object across the bus from a storage device to the memory;

transferring the data object from the memory to the receiver through the communication adapter;

determining whether to retain the data object in the memory after receiving an acknowledgment of receipt of the data object by the receiver; and

responsive to a determination that the data object is to be retained, retaining the data object in the memory for use in responding to subsequent requests for the data object.

4. The method of claim 1 further comprising:

responsive to the data object being present in the memory, determining whether the data object in the memory is valid;

responsive to the data object in the memory being invalid, transferring a valid copy of the data object across the bus from a storage device to the memory; and

transferring the valid copy of the data object from the memory to the receiver through the communication adapter.

5. The method of claim 1, wherein the data processing system is a Web server.

6. The method of claim 1, wherein the data object is at least one of a Web page, an image, a text file, an audio file, and a program.

7. The method of claim 1, wherein the request is a data transfer request generated by the data processing system in response to receiving an initial request from the receiver.

8. The method of claim 5, wherein the data transfer request includes data descriptors for the data object.

9. The method of claim 1, wherein the receiving, determining, and transferring steps are implemented in the communication adapter.

10. The method of claim 1, further comprising:

responsive to the data object being present in the memory, comparing a first versioning identifier associated with the data object to a second versioning identifier; and

responsive to an absence of a match between the first versioning identifier and the second versioning identifier, transferring a new version of the data object across the bus from a storage device to the memory.

11. The method of claim 1, wherein the data object contains a set of fragments, which may be referenced using an offset.

12. A data processing system for transferring data objects, the data processing system comprising:

a bus system;

a memory connected to the bus system, wherein the memory includes a set of instructions;

a host processing unit connected to the bus system; and

a communications unit connected to the bus system, wherein the communications unit executes the set of instructions to receive a request for a data object at a communication adapter;

determine whether the data object is stored in a memory in the communication adapter in response to receiving the request; and

transfer the data object from the memory to a receiver of the data object through the communication adapter in which transfer of the data across a bus connecting the communication adapter to the data processing system is unnecessary in response to the data object being present in the memory.

13. A data processing system for transferring data objects, the data processing system comprising:

receiving means for receiving a request for a data object at a communication adapter;

determining means, responsive to receiving the request, for determining whether the data object is stored in a memory in the communication adapter; and

transferring means, responsive to the data object being present in the memory, for transferring the data object from the memory to a receiver of the data object through the communication adapter, wherein transfer of the data across a bus connecting the communication adapter to the data processing system is unnecessary.

14. The data processing system of claim 13, wherein the transferring means is a first transferring means and further comprising:

second transferring means, responsive to the data object being absent in the memory, for transferring the data object across the bus from a storage device to the memory;

third transferring means for transferring the data object from the memory to the receiver through the communication adapter; and

retaining means for retaining the data object in the memory for use in responding to subsequent requests for the data object.

15. The data processing system of claim 13, wherein the transferring means is a first transferring means, the determining means is a first determining means, and further comprising:

fourth transferring means, responsive to the data object being absent in the memory, for transferring the data object across the bus from a storage device to the memory;

fifth transferring means for transferring the data object from the memory to the receiver through the communication adapter;

second determining means for determining whether to retain the data object in the memory after receiving an acknowledgment of receipt of the data object by the receiver; and

retaining means, retaining responsive to a determination that the data object is to be retained, for retaining the data object in the memory for use in responding to subsequent requests for the data object.

16. The data processing system of claim 13, wherein the determining means is a first determining means, the transferring means is a first transferring means, and further comprising:

third determining means, responsive to the data object being present in the memory, for determining whether the data object in the memory is valid;

sixth transferring means, responsive to the data object in the memory being invalid, for transferring a valid copy of the data object across the bus from a storage device to the memory; and

seventh transferring means for transferring the valid copy of the data object from the memory to the receiver through the communication adapter.

17. The data processing system of claim 13, wherein the data processing system is a Web server.

18. The data processing system of claim 13, wherein the data object is at least one of a Web page, an image, a text file, an audio file, and a program.

19. The data processing system of claim 13, wherein the request is a data transfer request generated by the data processing system in response to receiving an initial request from the receiver.

20. The data processing system of claim 17, wherein the data transfer request includes data descriptors for the data object.

21. The data processing system of claim 13, wherein the receiving, determining, and transferring means are implemented in the communication adapter.

22. The data processing system of claim 13, wherein the transferring means is a first transferring means and further comprising:

comparing means, responsive to the data object being present in the memory, for comparing a first versioning identifier associated with the data object to a second versioning identifier; and

eighth transferring means, responsive to an absence of a match between the first versioning identifier and the second versioning identifier, for transferring a new version of the data object across the bus from a storage device to the memory.

23. The data processing system of claim 13, wherein the data object contains a set of fragments, which may be referenced using an offset.

24. A computer program product in a computer readable medium for transferring data objects, the computer program product comprising:

first instructions for receiving a request for a data object at a communication adapter;

second instructions, responsive to receiving the request, for determining whether the data object is stored in a memory in the communication adapter; and

third instructions, responsive to the data object being present in the memory, for transferring the data object from the memory to a receiver of the data object through the communication adapter, wherein transfer of the data across a bus connecting the communication adapter to the data processing system is unnecessary.