Date: Thu, 28 Feb 2008 20:18:24 +0100
From: Ingo Molnar <mingo@elte.hu>
To: linux-kernel@vger.kernel.org, "Carlos R. Mafra" <crmafra2@gmail.com>
Subject: Re: Interactivity issue in 2.6.25-rc3
Message-ID: <20080228191824.GA20019@elte.hu>
References: <20080228184407.GA7117@localhost.ift.unesp.br>
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* Carlos R. Mafra <crmafra2@gmail.com> wrote:

> I want to report a bad interactivity which happened in my desktop 
> running the latest kernel (2.6.25-rc3-00081-g7704a8b).
> 
> I tried to play 'flightgear' and the desktop became _very_ slow while 
> flightgear was "loading scenery objects" (a task which never finished 
> and I could not play it).
> 
> The desktop is a P4 @ 3.0 GHz, 512MB, with the nv graphics driver.

yes, but this means you run the soft-3D driver under Xorg, right? That 
is known to starve its clients. The stats you sent show no worse than a 
few tens of msecs delays caused by CPU scheduling itself:

  mrxvt (3730, #threads: 1)
  se.wait_max                        :            18.679129

so the scheduler kept things within the ~40 msecs default latency 
target:

  .sysctl_sched_latency                    : 40.000000

	Ingo
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