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Analysis of Buffer Delay in Web-Server Control

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Author

Summary, in English

This paper addresses a problem related to control of web servers. Due to architectual issues, relevant measurements can only be taken over a limited part of the server system, which leaves the controller unaware of what happens in buffers proceeding the actual web-server (for instance, in the TCP/IP layers). In earlier presented work we modeled such a system and proved that the unmeasured buffering turned a measurement of an input disturbance into a state-dependent variable. In this paper we investigate how these new properties effect a traditional control design consisting of feedback in combination with a feed-forward mechanism. The stability analysis suggests that under certain circumstances, the system enters limit cycles due to the feedback mechanism introduced by the designed feed-forward controller. We verify the analysis by both simulations and experiments.

Publishing year

2010

Language

English

Pages

1047-1052

Publication/Series

2010 American Control Conference

Document type

Conference paper

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Control Engineering

Conference name

American Control Conference, 2010

Conference date

2010-06-30 - 2010-07-02

Conference place

Baltimore, MD, United States

Status

Published

Research group

  • LCCC

ISBN/ISSN/Other

  • ISSN: 0743-1619