> On Mon, Oct 22, 2001 at 04:01:12PM +0200, Der Herr Hofrat wrote: > > Hi ! > > > > same code just a bit more human redable...to check the jitter of a system - > > note that the jitter reported is a theorectical one as it is the delay that > > can be introced between any two calls on a non-rt system. compile it and run > > it on a idle box - if you let it run long enough you will see 1s maximum ! > > if you load the box heavaly (pingflood , multiple ls -lR / , compile kernel > > with make -j 60 ...) you will find half second jumps happening quite soon. > > (just ran it on a PIII/800). You also might want to look at the gethrtime > > function in rtlinux (rtlinux-3.X/schedulers/i386/rtl_time.h) > > Hi. > > Thank-you VERY much for this, it's really helpful. Except... > > Currently, it works fine for user-space stuff. It quite happily sits > there teling me how long it took between calls. > > Except that as soon as I migrate it to kernel-space [rt or not], I get > nada. Below is a butchered variant on hello.c. Am I missing anything > horrible obvious? > the rt-variant is already available in rtlinux-3.X/examples/measurements/rt_process.o + monitor . so you don't need to write it up your selfe. The idea of the littl jitt.c program is to allow for you to see jitter would be in user space for kernel space the examples/measurements/ directory contains all you need for evaluating your platforms rt-performance.
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