[CentOS] Tyan K8SRE troubles with CentOS 4.4 i386

Wed Dec 13 23:20:56 UTC 2006
William Warren <hescominsoon at emmanuelcomputerconsulting.com>

have you tried single sourcing the ram in one of those machines?  I 
think the mixed capacities are causing issues.

Dan Halbert wrote:
> We have been seeing failures with CentOS 4.4 i386 (not x86_64) running 
> compute-intensive programs on Tyan K8SRE (S2891) Tymotherboards, running 
> Opteron 265's. This motherboard is used in the Tyan barebones box GT24 
> (B2881). We have these boards populated with 8GB of RAM, consisting of 
> mixed 2GB and 1GB sticks.
> 
> The symptom is that CPU-bound programs (may or may not be related to 
> floating point) fail randomly and intermittently, with wrong answers or 
> segfaults. Running several in parallel seems to make the failures more 
> likely. We have not seen any kernel crashes. It is not hard to reproduce 
> the problem with some internal programs we have; it takes only a few 
> minutes.
> 
> This is using a completely-up-to-date-as-of-yesterday CentOS 4.4 i386, 
> hugemem or not doesn't make a difference. We have seen this on many 
> boxes, so it's not bad memory. We do NOT see this problem if we run 
> CentOS 4.4 x86_64 on the same boxes, using the same 32-bit test 
> executables. We also don't see this problem on some slightly older boxes 
> with Tyan K8SD motherboards running CentOS 4.4 i386 (also Opteron 265's, 
> with 8GB of 1GB DIMMs).
> 
> We have been looking at BIOS settings, but haven't seen anything that 
> stands out. memtest86 does not show errors.
> 
> Thanks for any suggestions of what this issue might be,
> Dan
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> 

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