Motivating and Modeling SIP Offload

Author

Zou, Jia ; Dai, Yiqi

Author_Institution

Tsinghua Univ., Beijing

fYear

2007

fDate

13-16 Aug. 2007

Firstpage

741

Lastpage

746

Abstract

Session Initiation Protocol (SIP) is one building block for IP Multimedia Subsystem (IMS) and Next Generation Network (NGN), and is becoming ubiquitous in Internet telephony services. Therefore, the performance issue of SIP servers is becoming crucial. In this paper, SIP stack processing is identified to be CPU-bound in nature and dominates the system overhead for common SIP server scenarios. These facts provide motivations for the idea of SIP offload. We also find that current protocol offload models have not considered program parallelism and can not analyze throughput and latency in together, which makes them difficult to apply to SIP offload. Therefore, a new model is proposed based on 7 ratios capturing fundamental properties of the protocol stack and offload scheme. The model can be applied in prediction of performance gains, selection of parameters for adaptive offloading schemes, and estimation of software or hardware characteristics using observed performance results.

Keywords

IP networks; Internet telephony; multimedia communication; signalling protocols; IP multimedia subsystem; Internet telephony services; SIP offload; SIP stack processing; next generation network; protocol stack; session initiation protocol; Delay; Internet telephony; Network servers; Next generation networking; Performance gain; Predictive models; Protocols; Software performance; Throughput; Web server; 3G IMS; Model; NGN; Offload; Parallelism; SIP;

fLanguage

English

Publisher

ieee

Conference_Titel

Computer Communications and Networks, 2007. ICCCN 2007. Proceedings of 16th International Conference on

Conference_Location

Honolulu, HI

ISSN

1095-2055

Print_ISBN

978-1-4244-1251-8

Electronic_ISBN

1095-2055

Type

conf

DOI

10.1109/ICCCN.2007.4317906

Filename

4317906