Re: [PATCH] O8int for interactivity

[Con Kolivas <kernel@kolivas.org>]

On Fri, 25 Jul 2003 02:12, Szonyi Calin wrote:
> Felipe Alfaro Solana said:
> > I'm playing a bit with tunables to see if I can tune the scheduler a
> > little bit for my system/workload. I've had good results reducing max
> > timeslice to 100 (yeah, I know I shouldn't do this too).
> >
> > Will keep you informed :-)
>
> same thing here. Reducing max timeslice to 100 is much better.
> It's the only thing that allow me to watch a movie while compiling
> the kernel with make -j 2 bzImage on my Duron 700Mhz with 256M RAM

Does this patch help?

Con

--- linux-2.6.0-test1-mm2/kernel/sched.c	2003-07-24 10:31:41.000000000 +1000
+++ linux-2.6.0-test1ck2/kernel/sched.c	2003-07-25 08:18:54.000000000 +1000
@@ -1243,7 +1243,7 @@ void scheduler_tick(int user_ticks, int 
 		} else
 			enqueue_task(p, rq->active);
 	} else if (p->mm && !((task_timeslice(p) - p->time_slice) %
-		 (MIN_TIMESLICE * (MAX_BONUS + 1 - p->sleep_avg * MAX_BONUS / MAX_SLEEP_AVG)))){
+		 (MIN_TIMESLICE * (1 + (MAX_BONUS - p->sleep_avg * MAX_BONUS / MAX_SLEEP_AVG) / 2)))){
 		/*
 		 * Running user tasks get requeued with their remaining timeslice
 		 * after a period proportional to how cpu intensive they are to