Re: [patch] [sched] load-balancer improvements, 2.5.3-pre5

[Ingo Molnar]

On Mon, 28 Jan 2002, Richard Guenther wrote:

> > +	cache_decay_ticks = (long)cacheflush_time/cpu_khz * HZ / 1000;
> > +
> >  	printk("per-CPU timeslice cutoff: %ld.%02ld usecs.\n",
> >  		(long)cacheflush_time/(cpu_khz/1000),
> >  		((long)cacheflush_time*100/(cpu_khz/1000)) % 100);
> > +	printk("task migration cache decay timeout: %ld msecs.\n",
> > +		(cache_decay_ticks + 1) * 1000 / HZ);

> Isnt it better for such randomly(?) choosen numbers like 1000 and 100
> which you use to divide / modulo to choose them as a near power of
> two? Like 1024 for / 1000 and 128 for the */% 100 above? For
> correctness just change cpu_khz to be 1024*hz, not 1000*hz.

it's not randomly chosen numbers. From cacheflush_time i'm calculating the
time it takes the cache to flush, in timer ticks.

	Ingo