Re: AW: L4_ThreadSwitch behaviour

On Fri Feb 16, 2007 at 11:30:17 +0100, Christian, Martin, OPEE45 wrote:
>Hi Ben!
>Now it's working! :-) I've changed two things:
>a) I'm using a loop for time slice donation
>b) I'm setting the prioriy of the Pager to 0xff (the same as roottask)
>
>I assume after the Pagefault IPC was created, the Scheduler is run to select the next runnable thread - which is roottask. Thus the Pager is never executed.
>
>But that seems unfair to me! Ping thread got donated a time slice but can't ever use it. Just because it creates a Pagfault at startup and thus sending an IPC is required, which in turn triggers the scheduler. But I suppose, that's life ... :-/

Getting scheduling right with timeslice donation is quite tricky, and
probably best avoided.

Cheers,

Benno