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2023-06-07 - 16:56

Dates and Events:

OSADL Articles:

2023-03-01 12:00

Embedded Linux distributions

Results of the online "wish list"

2022-01-13 12:00

Phase #3 of OSADL project on OPC UA PubSub over TSN successfully completed

Another important milestone on the way to interoperable Open Source real-time Ethernet has been reached

2021-02-09 12:00

Open Source OPC UA PubSub over TSN project phase #3 launched

Letter of Intent with call for participation is now available

2016-11-12 12:00

Raspberry Pi and real-time Linux

Let's have a look at the OSADL QA Farm data

Real Time Linux Workshops

1999 - 2000 - 2001 - 2002 - 2003 - 2004 - 2005 - 2006 - 2007 - 2008 - 2009 - 2010

Ninth Real-Time Linux Workshop on November 2 to 4, 2007, in Linz, Austria

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).


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