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Date: Fri, 13 Sep 2002 08:01:20 -0400 (EDT)
From: Bill Davidsen <davidsen@tmr.com>
To: Tobias Ringstrom <tori@ringstrom.mine.nu>
cc: Ingo Molnar <mingo@elte.hu>, 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 Thu, 12 Sep 2002, Tobias Ringstrom wrote:

> 3. More than 90% of all tasks in a system are classified as interactive at
>    any given time (since they are sleeping).  For example all cron jobs
>    are classified as interactive, which sounds really strange.  IMHO, it's
>    a good example of a non-interactive background job.  (I'll run my crond
>    at nice 19 for now.)
> 
>    I'm curious, why are you using the process average sleep time to
>    determine interactiveness and not the presense of prematurely abandoned
>    timeslices?

I'll ask that, too. Not because I doubt you have a good reason, but
because it doesn't jump out at me. I would like the CPU to go to the
process most likely to start an i/o and block, so the CPU hog can run
while the i/o takes place, because that seems to get the highest overlap
of CPU and i/o. I assume the current scheduler that as one of the goal,
clearly not the only one.

A few words of clarification would be educational.

-- 
bill davidsen <davidsen@tmr.com>
  CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.

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