Re: kernel thread scheduling question

[Nick Piggin]

Ben Greear wrote:
> I have a kernel thread that I would like to have run at least
> every 1-2 miliseconds.
>
> I think I would be happy if there were a way to have the
> process yield/schedule() at least once per ms with the
> understanding that it would get to wake again 1-2ms later.
> Is there a way to do such a thing without hacking up the
> scheduler code?
>
> I have tried 2.6.4 with pre-empt, and setting the thread priority
> to -18, but I still see cases where the process is starved for 20+
> milliseconds every 3-5 seconds or so.  Other than this single
> process, there is not a big load on the system.

Use realtime scheduling. sched_setscheduler (2) is a good
place to start.

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