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From: Ed Tomlinson <tomlins@cam.org>
Organization: me
To: Davide Libenzi <davidel@xmailserver.org>
Subject: Re: [patch] O(1) scheduler-H6/H7 and nice +19
Date: Mon, 14 Jan 2002 21:18:36 -0500
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Cc: Ingo Molnar <mingo@elte.hu>, lkml <linux-kernel@vger.kernel.org>,
        Dave Jones <davej@suse.de>
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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

Ed Tomlinson










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