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2009-06-10 12:00
New waves with LinuxAnalyze the temporal relationship of Linux tasks using the kernel tracer
2009-06-09 12:00
Mainline Realtime Linux (PREEMPT_RT) 2.6.29 declared "Latest Stable"Upgrade to 2.6.29.4-rt17 and enjoy better performance and responsiveness of the Linux kernel than ever before
2009-06-02 12:00
Do you need a graphical user interface for your embedded system?The Linux kernel is ideally suitable for all variants of embedded systems - but many devices need a GUI on top of it. The Qt toolkit and services ...
2009-05-30 12:00
Meet Linux real time kernel developers at RTLWS11Everything you always wanted to know about Linux real time but were afraid to ask
2009-04-16 12:00
OSADL welcomes its new membersIntel, SERCOS International & SYSGO join OSADL - meet them at our Open Source conference at the Hannover Fair 2009 |
OSADL Project: Real Time Linux Workshops
Real Time Linux Foundation Workshops since 1999
Real Time Linux Workshops
1999 - 2000 - 2001 - 2002 - 2003 - 2004 - 2005 - 2006 - 2007 - 2008 - 2009
Ninth Real-Time Linux Workshop on November 2 to 4, 2007, in Linz, Austria
Announcement - Agenda - Paper Presentations
Assessment of the Realtime Preemption Patches (RT-Preempt) and their impact on the general purpose performance of the system
Arther Siro, Carsten Emde, Nicholas McGuire
With the maturing of the Realtime Preemption Patches (RT-Preempt) and their stepwise integration into the Mainline Linux kernel since version 2.6.18, we set out to answer the questions: - How good is RT-Preempt with respect to the worst-case latency? - How expensive is RT-Preempt with respect to a possible performance degradation of the system?
Taking that a lot of the preemption techniques deployed have their origin in scalability demands and not so much in realtime requirements, the most interesting case to look into is related to uni-processors - on these we would expect the worst-case impact of RT-Preempt. To answer the question, we ran an extensive benchmark series on 2.8-GHz P4 and 1-GHz VIA CIII boards, measuring general OS performance parameters as well as the realtime capabilities. For the latter, a trivial parport toggle program was used. The results show that high-end CPUs are well supported by RT-preempt in general. Low-end systems typically of interest for automation and control, however, still need some work.
In this paper we will outline the method used for evaluation and present the details of the results. This work was partly supported by the Open Source Automation Development Lab (OSADL).

