METHOD AND APPARATUS FOR DETERMINING MINIMUM ROUND TRIP TIMES FOR A NETWORK SOCKET

• US 20080056147A1
• Filed: 08/29/2006
• Published: 03/06/2008
• Est. Priority Date: 08/29/2006
• Status: Abandoned Application

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Elliott, Steven L., Gupta, Nikhil, Lazzaro, Christopher Victor
• Application Number:
  US11/468,183
• Publication Number:
  US 20080056147A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0864 Round trip delays
• CPC Class Codes: H04L 43/50 Testing arrangements
• CPC Class Codes: H04L 69/16 Implementation or adaptation of Internet protocol [IP], of transmission control protocol [TCP] or of user datagram protocol [UDP]
• CPC Class Codes: H04L 69/163 In-band adaptation of TCP data exchange; In-band control procedures

Abstract

A computer implemented method, apparatus and computer usable program code for identifying a minimum round trip time over a socket for use in transmitting data over a connection. Two packets are sent over the connection to an endpoint. Round trip times are identified for the two packets in response to receiving acknowledgments for the two packets. Two additional packets of the connection are sent after round trip times for the two packets have been identified. Additional round trip times for the two additional packets are identified in response to receiving additional acknowledgments for the two additional packets. The repeating and identifying steps are repeated for a selected period of time, wherein a lowest round trip time identified for packets sent over the connection during the selected period of time is used as the minimum round trip time for use in sending data over the connection.

Claims

1. A computer implemented method for identifying a minimum round trip time over a socket for use in transmitting data over a connection, the computer implemented method comprising:

sending two packets over the connection to an endpoint;

responsive to receiving acknowledgments for the two packets, identifying round trip times for the two packets;

sending two additional packets of the connection after round trip times for the two packets have been identified;

responsive to receiving additional acknowledgments for the two additional packets, identifying additional round trip times for the two additional packets; and

repeating the sending and identifying steps for a selected period of time, wherein a lowest round trip time identified for packets sent over the connection during the selected period of time is used as the minimum round trip time for use in sending data over the connection.

2. The computer implemented method of claim 1 further comprising:

transmitting the data over the connection to the endpoint using the minimum round trip time.

3. The computer implemented method of claim 1, wherein the computer implemented method is initiated prior to transmitting any of the data over the connection.

4. The computer implemented method of claim 1, wherein the computer program product is for a transport layer.

5. A computer program product comprising:

a computer usable medium having computer usable program code for identifying a minimum round trip time over a socket for use in transmitting data over a connection, the computer program medium comprising;

computer usable program code for sending two packets over the connection to an endpoint;

computer usable program code, responsive to receiving acknowledgments for the two packets, for identifying round trip times for the two packets;

computer usable program code for sending two additional packets of the connection after round trip times for the two packets have been identified;

computer usable program code, responsive to receiving additional acknowledgments for the two additional packets, for identifying additional round trip times for the two additional packets; and

computer usable program code for repeating the sending and identifying steps for a selected period of time, wherein a lowest round trip time identified for packets sent over the connection during the selected period of time is used as the minimum round trip time for use in sending data over the connection.

6. The computer program product of claim 5 further comprising:

computer usable program code for transmitting the data over the connection to the endpoint using the minimum round trip time.

7. The computer program product of claim 5, wherein the computer implemented method is initiated prior to transmitting any of the data over the connection.

8. The computer program product of claim 5, wherein the computer implemented method is implemented in a transport layer.

9. A data processing system comprising:

a bus;

a communications unit connected to the bus;

a storage device connected to the bus, wherein the storage device includes computer usable program code; and

a processor unit connected to the bus, wherein the processor unit executes the computer usable program code to identify a minimum round trip time over a socket for use in transmitting data over a connection;

send two packets over the connection to an endpoint;

identify round trip times for the two packets in response to receiving acknowledgments for the two packets;

send two additional packets of the connection after round trip times for the two packets have been identified;

identify additional round trip times for the two additional packets in response to receiving additional acknowledgments for the two additional packets; and

repeating the sending and identifying steps for a selected period of time, wherein a lowest round trip time identified for packets sent over the connection during the selected period of time is used as the minimum round trip time for use in sending data over the connection.

10. The data processing system of claim 9, wherein the processor unit further executes the computer usable program code to transmit the data over the connection to the endpoint using the minimum round trip time.

11. The data processing system of claim 9, wherein the computer implemented method is initiated prior to transmitting any of the data over the connection.