Subject: Re: 2.6.0-test3-mm1 interactivity scheduling mistakes (smp)
From: Felipe Alfaro Solana <felipe_alfaro@linuxmail.org>
To: Helge Hafting <helgehaf@aitel.hist.no>
Cc: LKML <linux-kernel@vger.kernel.org>
In-Reply-To: <20030813180020.GA1339@hh.idb.hist.no>
References: <20030813180020.GA1339@hh.idb.hist.no>
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Message-Id: <1060798101.603.47.camel@teapot.felipe-alfaro.com>
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Date: Wed, 13 Aug 2003 20:08:21 +0200
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On Wed, 2003-08-13 at 20:00, Helge Hafting wrote:
> I ran a "nice make -j3 bzImage" on 2.6.9-test3-mm1 in order
> to compile 2.6.0-test3-mm2 on my dual celeron.
> 
> While waiting I played cuyo, a lightweight game similiar to tetris.
> 
> This mostly behaved as expected, with a responsive game.
> But mozilla (on some other virtual desktop) occationally
> refreshed its page, causing several seconds with jerky response
> in the game.
> 
> This is wrong for two reasons:
> 1. There should be enough cpu with two processors,
>    one running the game and another the heavy mozilla stuff.
>    The make was niced after all.  No guessing, I told it explicitly.
> 
> 2. The game has very interactive behaviour, it uses  4-10% cpu
>    and cause X to use about 20%.  Mozilla may have been idle for a 
>    while, getting "interactive".  But it shouldn't remain
>    interactive  for so long,  it sat at 100% till it went
>    idle again.   
> 
> X runs with elevated priority, (std. debian testing setup)
> but that shouldn't matter - X only used 20% and that was
> for the game and two xterms.  Mozilla wasn't visible
> at all.

I can't tell you why, but for me, X behaves horribly if it's not reniced
exactly at +0. In the past, I reniced X at -20, but Con told me that
with O??int patches, X must/should work with no nicing at all.

Could you please try again with X not reniced?
Thanks!

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