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Date:      Fri, 4 May 2001 08:40:14 GMT
From:      Wilko Bulte <wkb@freebie.demon.nl>
To:        Riccardo.Veraldi@fi.infn.it, Wilko Bulte <wkb@freebie.demon.nl>, Terry Lambert <tlambert@primenet.com>, <Riccardo.Veraldi@fi.infn.it>, <freebsd-alpha@freebsd.org>
Subject:   Re: vector: 0x670
Message-ID:  <E14vb8I-0006Zc-00@post.mail.nl.demon.net>

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> Hi all thanks a lot for yoyur valuable help.
> I Think it might be a problem due to over heating.
> I removed the dissipator and when I did it hte machine crashed after a few
> minutes with the machien check 0x670 error... I will change dissipator

Why? I expect this machine to have the standard DEC heatsink? Or has somebody
messed with it?

> size and will add special glue for disipation between the CPU and

Alpha CPUs by default have a Grafoil heat conducting foil between the 
CPU and the heatsink. It is a small dark gray patch of foil. Is that one
missing? Bad idea.. Also, be careful not to over-torque the heatsink mounting
nuts!

> dissipator and I will add a fan and let you know what is going to happen.
> Now hte CPU is so hot that  Icannot even try to put my finger over it!!

Be careful! You could permanently kill it this way!!

Any chance you can make a picture available (borrowing a digital camera or
so) of what you have in this machine? 

Wilko

> 
> Rick
> 
> 
>  On Wed, 2 May
> 2001, Wilko Bulte wrote:
> 
> > Date: Wed, 2 May 2001 20:37:06 +0200
> > From: Wilko Bulte <wkb@freebie.demon.nl>
> > To: Terry Lambert <tlambert@primenet.com>
> > Cc: Riccardo.Veraldi@fi.infn.it, freebsd-alpha@freebsd.org
> > Subject: Re: vector: 0x670
> >
> > On Wed, May 02, 2001 at 06:27:38PM +0000, Terry Lambert wrote:
> > > > 670     Processor Uncorrectable   unrecoverable cache or TLB errors, or
> > > >                                   read of a non-existent I/O space
> > > >
> > > >
> > > > Do you think it can be an error due to overheating or do I have to throw
> > > > my AlphaStation away ??
> > >
> > > No quick answers, but some things to try, and some advice and
> > > opinions...
> > >
> > >
> > > A cache error means that the processor is bad, if it's L1 cache;
> > > this could be the result of overheating.  If it's L2 cache, the
> > > cause could still be overheating, but I've seen a lot of people
> > > trying to use cache chips that were too slow.
> >
> > I don't recall which AS version this was, but most of the have
> > SMD soldered on caches. Some have cache modules, some cache SIMMs.
> > In case of cache modules of any shape or form please check if they
> > are seated well.
> >
> > > - If it's overheating, that's usually the result of overclocking,
> > > either intentionally, or unintentionally.  Make sure you are not
> > > doing that.
> >
> > Easily tested by trying if your fingers get fried when touching the
> > heatsink.
> >
> > > You might also be using memory which is too slow, or has fake
> > > parity instead of real parity (don't do that).  Slow memory
> > > tends to become more of an issue when you stick in a lot of it,
> > > since the DMA refresh doesn't get around to each bank in time;
> > > this is particularly problematic if you are doing heavy I/O,
> > > so that the memory bus is latched for DMA, and refresh is thus
> > > delayed really long due to bus hold times; this is usually
> > > possible to adjust in the drivers or controller configurations
> > > and is often called "bus on" time.
> >
> > *Very* unlikely. Alpha machines are built to really drive lots
> > of memory. Not this whimpy PC stuff that drives only 4 SIMMs/DIMMs
> > from a single ASIC.
> >
> > > - I've occasionally loaded a machine with too much memory for
> > > it to reasonably handle refresh, given the memory bus speed
> > > and the bus-on time for some PCI controllers (I had an Adaptec
> > > that was a bus hog; when I loaded the disk subsystem with the
> > > extra amount of RAM, the refresh failed, and the system lost
> > > its mind).
> >
> > Again, unlikely.
> >
> > > A TLB error means that the contents of a Translation Lookaside
> > > Buffer are incorrect.  This could be a kernel bug.
> >
> > Or the CPU is dead/dying. Seen that before..
> >
> > --
> > |   / o / /  _  	 Arnhem, The Netherlands    	email: wilko@freebsd.org
> > |/|/ / / /( (_) Bulte	 Powered by FreeBSD/alpha 	http://www.freebsd.org
> >
> 


-- 
|   / o / /  _  	 Arnhem, The Netherlands   email: wilko@freebsd.org
|/|/ / / /( (_) Bulte	 http://www.freebsd.org   
http://www.nlfug.nl


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