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Subject: Re: Problem with the O(1) scheduler in 2.4.19
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tobias Ringstrom <tori@ringstrom.mine.nu>
Cc: Ingo Molnar <mingo@elte.hu>,
       Kernel Mailing List <linux-kernel@vger.kernel.org>
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Date: 02 Sep 2002 14:07:13 +0100
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On Sun, 2002-09-01 at 22:53, Tobias Ringstrom wrote:
> While the O(1) scheduler has performed very well for me in most
> situations, I have one big problem with it.  When running a Counter-Strike
> game server on Linux 2.4.19 with the sched-2.4.19-rc2-A4 patch applied,
> the server process is niced from the default value of 15 (interactive) to
> 25 (background).  This means that every time crond wakes up or a mail
> arrives the game latency becomes extremely bad and the users experience
> lag.
> 
> The process takes around 70% CPU on these occasions, so I'm surprised that
> the task is not considered to be interactive.
> 
> This does not happen with stock 2.4.19.  Do you have any ideas why this
> regression is happening?

It isnt a regression, its a bug fix. The nice value is now being
honoured properly.

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