linux-kernel - Re: Interactivity issue in 2.6.25-rc3

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Message-ID: <20080228191824.GA20019@elte.hu>
Date:	Thu, 28 Feb 2008 20:18:24 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-kernel@...r.kernel.org,
	"Carlos R. Mafra" <crmafra2@...il.com>
Subject: Re: Interactivity issue in 2.6.25-rc3


* Carlos R. Mafra <crmafra2@...il.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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