Method and system for transmission control protocol (TCP) traffic smoothing

• US 8,072,886 B2
• Filed: 01/05/2010
• Issued: 12/06/2011
• Est. Priority Date: 03/11/2005
• Status: Active Grant

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Broadcom Corporation (Broadcom, Inc.)
• Inventors: Kwan, Bruce, Agarwal, Puneet
• Primary Examiner(s): Duong, Frank
• Application Number:
  US12/652,402
• Publication Number:
  US 20100172260A1
• Time in Patent Office: 700 Days
• Field of Search: 370229-235, 370/395.52, 370/463, 370/473
• US Class Current: 370/235
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 47/193 at the transport layer, e.g. TCP related
• CPC Class Codes: H04L 47/22 Traffic shaping

Abstract

Various aspects of a method and system for transmission control protocol (TCP) traffic smoothing are presented. Traffic smoothing may comprise a method for controlling data transmission in a communications system that further comprises scheduling the timing of transmission of information from a TCP offload engine (TOE) based on a traffic profile. Traffic smoothing may comprise transmitting information from a TOE at a rate that is either greater than, approximately equal to, or less than, the rate at which the information was generated. Some conventional network interface cards (NIC) that utilize TOEs may not provide a mechanism that enables traffic shaping. By not providing a mechanism for traffic shaping, there may be a greater probability of lost packets in the network.

Claims

1. A method, comprising:

in a network interface chip;

determining a token count value associated with said network interface chip; and

scheduling based on said token count value, transmission of a packet to be transmitted via said network interface chip, wherein said scheduling comprises suspending said transmission when said token count value meets one or more criteria.

2. The method according to claim 1, wherein said token count value is associated with a specified information flow.

3. The method according to claim 2, wherein said specified information flow is identified based on at least a source address identifier and/or destination address identifier associated with said packet.

4. The method according to claim 1, wherein said token count value is associated with a specified class of service.

5. The method according to claim 4, wherein said specified class of service is identified based on a class of service identifier associated with said packet.

6. The method according to claim 1, comprising transmitting said packet at least when said token count value exceeds a minimum value.

7. The method according to claim 1, comprising decreasing said token count value subsequent to transmission of said packet.

8. The method according to claim 1, comprising suspending transmission of said packet when said token count value falls below a minimum value.

9. The method according to claim 1, comprising increasing said token count value based on a determined time rate of increase.

10. The method according to claim 1, comprising determining whether to transmit said packet or suspend transmission of said packet based on a rate control message, wherein said rate control message is received via an interface utilized by said network interface chip for transmitting said packet.

11. A system, comprising:

one or more circuits that are operable to determine a token count value associated with a network interface chip; and

said one or more circuits are operable to schedule based on said token count value transmission of a packet to be transmitted via said network interface chip, wherein said scheduling comprises suspending said transmission when said token count value meets one or more criteria.

12. The system according to claim 11, wherein said token count value is associated with a specified information flow.

13. The system according to claim 12, wherein said specified information flow is identified based on at least a source address identifier and/or destination address identifier associated with said packet.

14. The system according to claim 11, wherein said token count value is associated with a specified class of service.

15. The system according to claim 14, wherein said specified class of service is identified based on a class of service identifier associated with said packet.

16. The system according to claim 11, wherein said one or more circuits are operable to enable transmission of said packet at least when said token count value exceeds a minimum value.

17. The system according to claim 11, wherein said one or more circuits are operable to decrease said token count value subsequent to transmission of said packet.

18. The system according to claim 11, wherein said one or more circuits are operable to suspend transmission of said packet when said token count value falls below a minimum value.

19. The system according to claim 11, wherein said one or more circuits are operable to increase of said token count value based on a determined time rate of increase.

20. The system according to claim 11, wherein said one or more circuits are operable to determine whether to transmit said packet or suspend transmission of said packet based on a rate control message, wherein said rate control message is received via an interface utilized by said network interface chip for transmitting said packet.