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Date: Mon, 2 Sep 2002 23:44:46 +0200 (CEST)
From: Tobias Ringstrom <tori@ringstrom.mine.nu>
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To: Alan Cox <alan@lxorguk.ukuu.org.uk>
cc: Ingo Molnar <mingo@elte.hu>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Problem with the O(1) scheduler in 2.4.19
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On Mon, 2 Sep 2002, Tobias Ringstrom wrote:

> On 2 Sep 2002, Alan Cox wrote:
> 
> > It isnt a regression, its a bug fix. The nice value is now being
> > honoured properly.
> 
> The problem is that the kernel decided to nice the process (by changing
> the priority, not the nice value) as if it was a background task, but it's
> not a background task.  On the contrary, it's highly interactive.

I think I will have to take this back.  It looks like even the old kernel
treats the game server as a background process, but as you said, it does
not make such a big difference.  Another change is that the prio value 
varies very quickly over time (as seen in top).  I do not recall seeing 
that using the O(1)-scheduler.

But I still do not understand why the process is classified as
non-interactive...  Around 20 times per second it does a nanosleep for
1 ms which takes around 40 ms in reality.  (Seeing this makes me believe 
that I should try to increase HZ, but that is a separate issue.)

/Tobias


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