QLinux: A QoS enhanced Linux Kernel for Multimedia Computing (fwd)

[S Chetan Kumar <chetansk@xxxxxxxxxxxxxxxx>]

My apologies, if someone on the list is not intrested on this.
- -Chetan S


- ---------- Forwarded message ----------
Date: Wed, 02 Jun 1999 11:53:42 -0400
From: Pawan Goyal <goyal@xxxxxxxxx>
To: end2end-interest@xxxxxxx
Cc: goyal@xxxxxxxxx
Subject: QLinux: A QoS enhanced Linux Kernel for Multimedia Computing

QLinux: A QoS enhanced Linux Kernel for Multimedia Computing

We are pleased to announce the public release of the QLinux kernel.
QLinux, based on the Linux 2.2.x kernel, combines some of the latest
innovations in operating systems research. It includes the following
features:

  *  Hierarchical Start Time Fair Queuing (H-SFQ) CPU scheduler
  *  Hierarchical Start Time Fair Queuing (H-SFQ) network packet
scheduler
  *  Lazy receiver processing (LRP) network subsystem
  *  Cello disk scheduling algorithm [not stable yet]

The H-SFQ CPU scheduler enables hierarchical scheduling of
applications by fairly allocating cpu bandwidth to individual
applications and application classes. The H-SFQ packet scheduler
provides rate guarantees and fair allocation of bandwidth to packets
from individual flows as well as flow aggregates (classes). Lazy
receiver processing enables accurate charging of TCP/UDP protocol
processing overhead (including interrupt processing) to the
appropriate process.  The Cello disk scheduler supports multiple
application classes such as interactive best-effort,
throughput-intensive best effort and soft real-time and fairly
allocates disk bandwidth to these classes.

When enabled, these features replace the standard features/schedulers
available in Linux. QLinux provides the flexibility of allowing any
combination of these features to be compiled as needed.

The current version for QLinux (based on the 2.2.0 kernel) is available
for download from

        http://www.cs.umass.edu/~lass/software/qlinux

A port to 2.2.9 kernel will be available in the near future.  The QLinux
developers can be reached at qlinux@xxxxxxxxxxxxx QLinux
announcements are available by subscribing to the qlinux-announce
mailing list
To subscribe, send a  mail to majordomo@xxxxxxxxxxxx with the body
"subscribe qlinux-announce"

QLinux is a joint effort between AT&T Labs-Research,
Distributed Multimedia Computing Laboratory (Univ. of Texas) and
the Laboratory for Advanced System Software (Univ. of Massachusetts).
QLinux has been developed by the following people:

Pawan Goyal (Ensim Corporation, formerly with AT&T Research)
Jasleen Kaur Sahni (Univ. of Texas)
Prashant Shenoy (Univ. of Massachusetts)
Raghav Srinivasan (Univ. of Massachusetts)
Harrick Vin (Univ. of Texas).
T. R. Vishwanath (Univ. of Texas)

We look forward to feedback from users of  QLinux.

Pawan Goyal, Prashant Shenoy and Harrick Vin
(qlinux@xxxxxxxxxxxx)



Acknowledgments
- ---------------

Inputs and/or resources for the QLinux project were provided by
Gisli Hjalmtysson (AT&T Research) and R. Gopal (AT&T Research)


References
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QLinux is based on the following research publications:

[1] P. Goyal and X. Guo and H.M. Vin, A Hierarchical CPU Scheduler for
Multimedia Operating Systems, Proceedings of 2nd Symposium on
Operating System Design and Implementation (OSDI'96), Seattle, WA,
pages 107-122, October 1996.

[2] P. Goyal and H. M. Vin and H. Cheng, Start-time Fair Queuing: A
Scheduling Algorithm for  Integrated Services Packet Switching
Networks, In IEEE/ACM Transaction on Networking, October 1997. A
preliminary
version appeared in the  Proceedings of ACM SIGCOMM'96,  pages 157-168,
August  1996.

[3] P. Druschel and G. Banga, Lazy Receiver Processing (LRP): A
Network Subsystem Architecture for Server  Systems, Proceedings of the
2nd Symposium on Operating System Design and Implementation (OSDI'96),
Seattle, WA, Pages 261-275, October 1996

[4] P  Shenoy and H M. Vin,  Cello: A Disk Scheduling Framework for
Next Generation Operating Systems, Proceedings of ACM SIGMETRICS
Conference, Madison, WI, 44-55, June 1998.


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