Analysis of Buffer Delay in Web-Server Control
(2010) American Control Conference, 2010 p.1047-1052- Abstract
- 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... (More)
- 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. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/1918189
- author
- Kjaer, Martin Ansbjerg LU and Robertsson, Anders LU
- organization
- publishing date
- 2010
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- host publication
- 2010 American Control Conference
- pages
- 1047 - 1052
- publisher
- IEEE - Institute of Electrical and Electronics Engineers Inc.
- conference name
- American Control Conference, 2010
- conference location
- Baltimore, MD, United States
- conference dates
- 2010-06-30 - 2010-07-02
- external identifiers
-
- wos:000287187901072
- scopus:77957803927
- ISSN
- 0743-1619
- language
- English
- LU publication?
- yes
- id
- 48d1d552-b635-467d-a8cb-eb431994c065 (old id 1918189)
- date added to LUP
- 2016-04-01 14:50:27
- date last changed
- 2022-01-28 02:47:53
@inproceedings{48d1d552-b635-467d-a8cb-eb431994c065,
abstract = {{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.}},
author = {{Kjaer, Martin Ansbjerg and Robertsson, Anders}},
booktitle = {{2010 American Control Conference}},
issn = {{0743-1619}},
language = {{eng}},
pages = {{1047--1052}},
publisher = {{IEEE - Institute of Electrical and Electronics Engineers Inc.}},
title = {{Analysis of Buffer Delay in Web-Server Control}},
year = {{2010}},
}