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Date: Tue, 3 Sep 2002 07:54:39 +0200 (CEST)
From: Ingo Molnar <mingo@elte.hu>
Reply-To: Ingo Molnar <mingo@elte.hu>
To: Tobias Ringstrom <tori@ringstrom.mine.nu>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>,
       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:

> 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.)

what CPU usage does it have? 70% CPU usage is not interactive.

well, even 70% CPU usage can be interactive if you lower its priority to
-20. But with the default nice value a task will lose its interactivity
much quicker.

also, could you increase HZ to 1000 (in asm/param.h, full recompile of the
kernel is needed), does it make a difference?

	Ingo

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