Re: ICH9 & Core2 Duo - kernel crash

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Pavol Cvengros wrote:
Bill Davidsen wrote:
Pavol Cvengros wrote:
On Thursday 06 December 2007 21:15:53 Bill Davidsen wrote:
Pavol Cvengros wrote:

I am trying LKML to get some help on one linux kernel related problem. Lately we got a machine with new HW from Intel. CPU is Intel Core2 Duo E6850 3GHz with 2GB of RAM. Motherboard is Intel DG33BU with G33 chipset.
After long fight with kernel crashes on different things, we
figured out
that if the multicore is disabled in bios, everything is ok and
is running good. No kernel crashes no problems, but with one core
This small table will maybe explain:

Cores   -     kernel   -   state
   2  -   nonsmp or smp  - crash
   1  -  smp or nonsmp  - ok

All crashes have been different (swaper, rcu, irq, init.....) or we just got internal gcc compiler error while compiling kernel/glibc/.... and the
machine was frozen.

Please can somebody advise what to do to identify that problem more
precisely. (debug kernel options?)

Our immpresion - ICH9 & ICH9R support in kernel is bad... sorry to say..
I have seen unusual memory behavior under heavy load, in the cases I saw it was heavy DMA load from multiple SCSI controllers, and one case with FFT on the CPU and heavy network load with gigE. Have you run memtest on
this hardware? Just a thought, but I see people running Linux on that
chipset, if not that particular board.

A cheap test even if it shows nothing. Of course it could be a CPU cache
issue in that one CPU, although that's unlikely.
yes, memtest was running all his tests without problems. The wierd
thing is that all kernel crashes we have seen were different (as
stated in original mail)....

The problem with memtest, unless I underestimate it, is that it doesn't use all core and siblings, so it doesn't quite load the memory system the way regular usage would. Needless to say, if this does turn out to be a memory loading issue I don't know of any tools to really test it. I fall back on part swapping, but that only helps if it's the memory DIMM itself.
right now that machine has 2 x 1GB DDR2 - 800MHz.... do you think I
should test the machine with only one DDR? (I hope to put there 4GB
all together)
Well, odd memory problems are rare, did you look for a BIOS update? It could be that the chipset isn't being set properly, and would explain why it might work differently with another BIOS. But if there's nothing else to try, it won't hurt to see if it works differently with only one DDR.
Bill Davidsen <[email protected]>
 "Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
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