Interesting Compile Problem - 2.6 Kernel

[Steve Jardine]

Naw - just trying to confirm what I have read. It is a true bummer. My company paid *huge* money for these systems...

~S

On Wed, 10 Oct 2007 10:22:02 -0700
"Lonni J Friedman" <netllama at gmail.com> wrote:

> On 10/9/07, Steve Jardine <sjardine at acm.org> wrote:
> > All,
> >
> >     I have a real strange one to relate to you.
> >
> >     System: 4 Xeon Processor, Dual Core with Hyperthreading
> >             PCI-E, PCI backplane
> >
> >     System A: CPU Family 15, Model 4, Stepping 1
> >     System B: CPU Family 15, Model 4, Stepping 8
> >
> >     Now, System A compiles fine with the processor type of Pentium 4/Xeon, and SMP/Multicasting set. All 8 cores show up without a problem. Boots perfectly.
> >
> >     However, System B with the same settings cannot boot. Kernel panics when attempting to boot.
> >
> >     What I have found out: Stepping 1 is a true Pentium 4 core, works as advertised. System B can *only* have the kernel compiled as a CPU Type of Pentium PRO. It shows all 8 cores and will perform hyperthreading if the flags are set in the kernel configuration with the CPU type of Pentium PRO.
> >
> >     I have read that the stepping 8 Xeon does not have 64 bit cvapability for processing or for I/O to/from the cores. It works the way I compiled it, but I would like to know why it must be this way??
> 
> You're asking us why Intel made the design decisions that they made?
> 
> -- 
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> L. Friedman                                    netllama at gmail.com
> LlamaLand                       https://netllama.linux-sxs.org
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