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Date: Tue, 11 Mar 2003 03:37:57 +0100
To: rwhron@earthlink.net, ingo@elte.hu
From: Mike Galbraith <efault@gmx.de>
Subject: Re: scheduler starvation running irman with 2.5.64bk2
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <20030311000923.GA1315@rushmore>
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At 07:09 PM 3/10/2003 -0500, rwhron@earthlink.net wrote:
> > OK, can you do the following to determine whether we're both seeing the
> > _same_ problem?
>
> > 1.)  build the attached rtnice utility (don't remember who wrote/posted 
> this)
> > 2.)  login on vt1 and set the shell SCHED_RR via rtnice -n 1 -p <pid_of_sh>
> > -d RR
> > 3.)  login on vt2 and renice that shell to -10
> > 4.)  login on another vt as a normal user, and start irman
> > 5.)  try login/out on another vt, or ps or _whatever_ (doesn't matter)
> > until box is starving
> > 6.)  on vt2, try to do ps (it should hang despite -10 priority)
> > 7.)  on vt1, try to do ps (it should work just fine)
>
>Here is the test as I understand it, splitted by tty.  Quick summary,
>only new process seems starved.  RR and nice -10 process behave okay.
>
>BTW, this is now with 2.5.64bk5.

The only difference I see is that reniced task wasn't starved with this 
kernel... wonder what the difference is.  Thanks for running the test.

         -Mike 

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