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Subject: RE: Weird Real memory reported with 5.4 PAE support
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Thanks David, this appears to have resolved the matter. Will wait and see if
any panics occur under heavy load.

This should really put this in the errata for 5.4-Release

Tamouh

> We've seen similar stuff with Supermicro servers.
> PCI/PCI-X/PCI-E (or something like that) uses memory
> addresses in the upper end of the 4GB barrier. The BIOS
> remaps any real memory above that. The more PCI slots you
> have the more is reserved, and the higher the BIOS has to
> remap it. (Someone can correct me if I'm wrong here, I may be
> oversimplifying).
>
> The panics you are seeing are a known bug in FreeBSD
> 5.4-RELEASE. The bug is fixed in 5-STABLE:
>
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/i386/pmap.c
> .diff?r1=1.494.2.9&r2=1.494.2.10&f=h
>
> For an unknown reason, the patch has not been commited to the
> 5.4-RELEASE-p* branches, or 5.4-STABLE. If you don't want to
> move all the way to 5-STABLE you can just make the above
> changes manually (it's just 2 lines) and rebuild, and it'll work fine.