Andy Ibbotson wrote: > When running from the "Live CD" I can set the base period to 17000ns anything > less generates RTAPI delays - is this in keeping with the jitter values? > The jitter is only part of the story. When you put tasks in the base thread, they have to finish executing within that thread time. Unfortunately, it is not very easy to find out how long each particular task takes to run on any specific CPU. There are statistics that rtapi takes, however, and so you can check the statistics on all the tasks in your base thread and add them up. You then need to leave a good cushion to cover cache flushes and other things that slow the CPU down from time to time. While 4 - 6 us jitter is QUITE good, that is just the scheduling jitter, ir tells you very little about how much the tasks need. If your base thread tasks take 15 us to complete, then clearly adding 4 - 6 us jitter, you will have trouble with a 17 us base period.
Jon ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing. http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
