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Date: Mon, 14 Jan 2002 18:33:26 -0800 (PST)
From: Davide Libenzi <davidel@xmailserver.org>
X-X-Sender: davide@blue1.dev.mcafeelabs.com
To: Ed Tomlinson <tomlins@cam.org>
cc: Ingo Molnar <mingo@elte.hu>, lkml <linux-kernel@vger.kernel.org>,
        Dave Jones <davej@suse.de>
Subject: Re: [patch] O(1) scheduler-H6/H7 and nice +19
In-Reply-To: <20020115021837.4A63969E@oscar.casa.dyndns.org>
Message-ID: <Pine.LNX.4.40.0201141829230.937-100000@blue1.dev.mcafeelabs.com>
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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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