Re: PAE causing failure to run various executables.

[avi <avi@argo.co.il>]

Dave Jones wrote:

> A fedora user recently filed a puzzling bug at
> https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169741
>
> The system being reported has exactly 4GB, and its E820
> tables seem to concur that there is in fact 4GB.
>
> When run in non-PAE mode, it triggers the
> "Warning only 4GB will be used. Use a PAE enabled kernel."
> message, which is odd, but the system does actually run.
>
>  
if there's a hole in the physical address space (for pci devices), you 
would need more than 32 bits to address 4GB RAM.

> When run in PAE mode, it seems to lose its mind, and it
> fails to run various binaries.
>
> Booting with mem=4G causes the machine to boot fine
> (though for some reason, it finds only 3042M of RAM).
>
>  
looks like a 1GB hole.


> The reporter of this bug has tested on 2.6.14-rc3-git4, and found the
> same issue exists as he saw on the original FC3 kernel, thus ruling out
> any Fedora-specific patches.
>
> Anyone have any ideas what's wrong here?
>
> 		
maybe the last 1GB is bad. since it can only be accessed by pae, only 
the pae kernel fails.

--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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