Re: Scheduler Problem ????

[Nick Piggin]

Emmanuel Fleury wrote:

> Hi all,
>
> I am running a 2.6.4 (with preemptible kernel activated). 
> What I did is the following:
>
> 1) Compile the sched_test.c program (at the end of the mail):
>
> [root@hermes sched]$ gcc -o sched_test sched_test.c
>
> 2) Set the priority of the root shell as the highest:
> [root@hermes sched]$ ps
>  PID TTY          TIME CMD
> 1519 pts/0    00:00:00 bash
> 2020 pts/0    00:00:00 ps
> [root@hermes sched]$ chrt -f -p 99 1519
>
> 3) Run sched_test:
> [root@hermes sched]$ chrt -f 10 ./sched_test 100
> bye now.
>  
>
>
> Here during the execution of sched_test everything is frozen.
>
>
> Did I do something wrong ????

Realtime processes aren't preemptible at all by non realtime
processes or realtime processes of a lesser priority.

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