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Date: Thu, 3 Jan 2002 10:54:23 -0200 (BRST)
From: Rik van Riel <riel@conectiva.com.br>
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To: Davide Libenzi <davidel@xmailserver.org>
Cc: Peter Osterlund <petero2@telia.com>, lkml <linux-kernel@vger.kernel.org>,
        Linus Torvalds <torvalds@transmeta.com>
Subject: Re: [PATCH] scheduler fixups ...
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On Wed, 2 Jan 2002, Davide Libenzi wrote:
> On 2 Jan 2002, Peter Osterlund wrote:
> > Davide Libenzi <davidel@xmailserver.org> writes:
> >
> > > a still lower ts
> >
> > This also lowers the effectiveness of nice values. In 2.5.2-pre6, if I
> > run two cpu hogs at nice values 0 and 19 respectively, the niced task
> > will get approximately 20% cpu time (on x86 with HZ=100) and this
> > patch will give even more cpu time to the niced task. Isn't 20% too
> > much?
>
> The problem is that with HZ == 100 you don't have enough granularity
> to correctly scale down nice time slices. Shorter time slices helps
> the interactive feel that's why i'm pushing for this.

So don't give the niced task a new timeslice each time,
but only once in a while.

regards,

Rik
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