Messages in this thread | | | Date | Mon, 05 Jul 2004 17:33:09 +0200 | From | Mike Galbraith <> | Subject | RE: Maximum frequency of re-scheduling (minimum time quantum) que stio n |
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At 10:18 AM 7/5/2004 -0400, Povolotsky, Alexander wrote:
>Mike - the part of my original question was - what is the minimum "measure" >(in time ticks or is fraction of the time tick ?) of that "(almost) any time >? In another words, assuming what is the latency between the moment, when >the higher priority process (or thread ) is becoming available to run (and >assuming that "schedule()" system call is not explicitly called at that time >...)and the moment when the scheduler STARTS (I am not including context >switch time into the question here) the process of preemtion (start of the >context switch). Is this time settable (at compile time ) ?
Ah, you want wakeup latency numbers. Sorry, I don't have any. I believe Andrew and Davide both wrote tools for measuring in the wild, a search of the archives should turn up something that will give you the numbers you're looking for.
If I'm understanding your question, no, there is no latency guarantee.
> >If you're looking for an interface into the scheduler that allows you to > >twiddle slice length > >you mean at the run time (vs compile time), I assume ?
Yes.
-Mike
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