Re: 5.2-CURRENT constantly crashing

On Thu, 29 Jul 2004, George D. Gal wrote:

> I experience the same dead freezes about on average 1x per day on my
> Dell D600 laptop. Although I'm really not sure what's causing it. Has
> anyone seen the problems go away? I really notice the problem when I'm
> using some more memory intensive apps like JRE or Mozilla Firefox, etc.. 

It appears to be triggered most frequently with threading, and most
frequently (perhaps always?) with PREEMPTION, maybe also less frequently
with SMP (although I haven't seen it with SMP and no PREEMPTION).  On my
notebook, disabling PREEMPTION didn't appear to have any negative effect
on interactivity or performance, but I also don't really use sound so
probably wouldn't notice things like chopiness in audio processing.

> Does having a debugging version of the kernel help at all to diagnose
> these issues? 

I think there's enough debugging information floating around that someone
will figure it out shortly.  There have been some test patches handed
around, but every time I get near one I stop being able to reproduce the
problem on my test box :-).  Now that John Baldwin is back from his
vacation that should help.

Robert N M Watson             FreeBSD Core Team, TrustedBSD Projects
robert_at_fledge.watson.org      Principal Research Scientist, McAfee Research


> 
> -george
> 
> ----- Original Message ----- 
> From: "DrVince" <drvince_at_anonymnet.net>
> Newsgroups: mpc.lists.freebsd.current,muc.lists.freebsd.current
> Sent: Thursday, July 22, 2004 8:02 AM
> Subject: Re: 5.2-CURRENT constantly crashing
> 
> 
> > On Thu, 22 Jul 2004 11:23:53 +0200, Jan Lentfer wrote
> > > i am running 5.2-CURRENT on an old 4x PPRO (200) Amdahl EnVista Server.
> > > The system is constantly crashing under heavy load for about 2-3
> > > month now. Since all drives are connected to a Mylex Raid Controller,
> > >  I can't get any kernel dumps :(.
> >
> > I've been reporting this for a while.  I have all new hardware and running 2
> > IDE local drives, nothing's faulty.  Everything is working fine now that I
> have
> > downgraded to 5.2.1. I have no kernel dump either since it's a problem with
> > software disk write buffer. But, at least, you get a message of what could
> be
> > the problem, I only got dead freezes.  For me, it wasn't heavy loads that
> was
> > crashing it, but only buffers getting full.
> >
> > At the moment, all I can say to help is, if you use dummynet or altq, be
> sure
> > to have HZ=1000 in your kernel.  But that won't help you much because your
> > server was working fine.
> >
> > Good luck,
> > DrVince
> > DrVince_at_anonymnet.net
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