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Analysis of Buffer Delay in Web-Server Control

Publiceringsår: 2010
Språk: Engelska
Sidor: 1047-1052
Publikation/Tidskrift/Serie: 2010 American Control Conference
Dokumenttyp: Konferensbidrag
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


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.


  • Control Engineering


American Control Conference, 2010
  • LCCC-lup-obsolete
  • ISSN: 0743-1619

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