From: Con Kolivas <kernel@kolivas.org>
To: Mike Galbraith <efault@gmx.de>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: 2.5.64-mm2->4 hangs on contest
Date: Mon, 10 Mar 2003 21:27:19 +1100 [thread overview]
Message-ID: <200303102127.19847.kernel@kolivas.org> (raw)
In-Reply-To: <5.2.0.9.2.20030310112452.00ce87b8@pop.gmx.net>
On Mon, 10 Mar 2003 21:29, Mike Galbraith wrote:
> At 11:05 AM 3/10/2003 +0100, Mike Galbraith wrote:
> >At 08:12 PM 3/10/2003 +1100, Con Kolivas wrote:
> >>On Mon, 10 Mar 2003 18:05, Mike Galbraith wrote:
> >> > At 01:29 PM 3/10/2003 +1100, you wrote:
> >> > >Tried running contest on 2.5.64-mm2 and mm4 and had the same thing
> >>
> >> happen.
> >>
> >> > > It will hang reliably during process_load. I tried not running
> >> > > process_load but it would still get stuck in one of the other loads
> >> > > (either a tar load or list load). I can simply stop contest at that
> >>
> >> stage
> >>
> >> > > but then the machine wont work well hanging at the console after a
> >>
> >> minute
> >>
> >> > > or so. This started at mm2 (doesn't happen with mm1).
> >> > >
> >> > >Here is the sysrq-p and sysrq-t output during process_load (which
> >> > > hangs every time):
> >> >
> >> > hmm, the below looks interesting to me...
> >> >
> >> > >ksoftirqd/0 R C129A000 2 1 3 (L-TLB)
> >> > >Call Trace:
> >> > > [<c0118f3e>] ksoftirqd+0x5e/0x9c
> >> > > [<c0118ee0>] ksoftirqd+0x0/0x9c
> >> > > [<c0106f1d>] kernel_thread_helper+0x5/0xc
> >> >
> >> > I see that too with irman. You could try renicing the shell you start
> >> > contest from to >= +12. With irman, what appears to be cpu starvation
> >> > ceases to be a problem at exactly +12. I also see kapmd constantly
> >>
> >> wanting
> >>
> >> > to run but not being serviced.
> >>
> >>Contest uses a modified process load from irman so it exhibits similar
> >>behaviour. Not sure what +12 actually tells me though :-(
> >
> >Aha! No wonder your symptoms look so similar. +12 is just a magic number
> >that works... found by trusty old trial and error method. What I wanted
> >to see was if your hang would also go away with the same magic number, or
> >if renicing with any value helped you at all.
> >
> >>My simplistic understanding is that the pipe task in process_load gets
> >>constantly elevated as "interactive" by the new scheduler, and nothing
> >> else ever happens.
> >
> >Appears so. I can make it "work" by doing a dinky (butt ugly:) tweak in
> >activate_task().
>
> Oh, what the heck. Even a butt ugly patch that works has informational
> value. Can you try the attached please? If it works for you too, maybe
> it'll tell Ingo something.
Sure. How about attaching it?
Con
next prev parent reply other threads:[~2003-03-10 10:16 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5.2.0.9.2.20030310075720.00c832f8@pop.gmx.net>
2003-03-10 9:12 ` 2.5.64-mm2->4 hangs on contest Con Kolivas
2003-03-10 10:05 ` Mike Galbraith
2003-03-10 10:21 ` William Lee Irwin III
2003-03-10 10:29 ` Mike Galbraith
2003-03-10 10:27 ` Con Kolivas [this message]
2003-03-12 9:21 ` Mike Galbraith
2003-03-12 10:25 ` Con Kolivas
2003-03-12 10:37 ` Mike Galbraith
2003-03-12 11:19 ` Con Kolivas
2003-03-12 12:30 ` Mike Galbraith
2003-03-13 1:22 ` Con Kolivas
2003-03-13 3:39 ` Mike Galbraith
2003-03-13 4:31 ` Mike Galbraith
2003-03-10 10:31 ` Mike Galbraith
2003-03-10 10:31 ` Con Kolivas
2003-03-10 10:43 ` Mike Galbraith
2003-03-10 10:42 ` Con Kolivas
2003-03-10 10:54 ` Mike Galbraith
[not found] <fa.ie98jja.2hkdj6@ifi.uio.no>
[not found] ` <fa.j59micm.1fhqe9k@ifi.uio.no>
2003-03-10 12:43 ` Ed Tomlinson
2003-03-10 12:47 ` Con Kolivas
2003-03-10 13:41 ` Mike Galbraith
2003-03-10 13:41 ` Ed Tomlinson
2003-03-10 14:12 ` Mike Galbraith
2003-03-10 14:04 ` Mike Galbraith
2003-03-10 2:29 Con Kolivas
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