Re: [patch] O(1) scheduler-H6/H7 and nice +19

From: Davide Libenzi (davidel@xmailserver.org)
Date: Mon Jan 14 2002 - 21:33:26 EST


On Mon, 14 Jan 2002, Ed Tomlinson wrote:

> On January 14, 2002 08:50 pm, Davide Libenzi wrote:
> > On Mon, 14 Jan 2002, Ed Tomlinson wrote:
> > > On January 13, 2002 10:45 pm, Davide Libenzi wrote:
> > > > On Sun, 13 Jan 2002, Ed Tomlinson wrote:
> > > > > With pre3+H7, kernel compiles still take 40% longer with a setiathome
> > > > > process running at nice +19. This is _not_ the case with the old
> > > > > scheduler.
> > > >
> > > > Did you try to set MIN_TIMESLICE to 10 ( sched.h ) ?make bzImage with
> > > > setiathome running nice +19
> > >
> > > This makes things a worst - note the decreased cpu utilizaton...
> > >
> > > make bzImage 424.33s user 32.21s system 48% cpu 15:48.69 total
> > >
> > > What is this telling us?
> >
> > Doh !
> > Did you set this ?
> >
> > #define MIN_TIMESLICE (10 * HZ / 1000)
>
> I set:
>
> #define MIN_TIMESLICE 10
>
> Now I am tring
>
> #define MIN_TIMESLICE 1
>
> which, looksing at monitors, gives about 80% cpu to the compile

try to replace :

PRIO_TO_TIMESLICE() and RT_PRIO_TO_TIMESLICE() with :

#define NICE_TO_TIMESLICE(n) (MIN_TIMESLICE + ((MAX_TIMESLICE - \
        MIN_TIMESLICE) * ((n) + 20)) / 39)

NICE_TO_TIMESLICE(p->__nice)

I'm currently running it on my machine but i don't want that this changes
that 'liquid' interactive feel that me and Ingo have got with the new code

- Davide

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