Weird Real memory reported with 5.4 PAE support

Tamouh H. hakmi at rogers.com
Sat Oct 1 11:26:03 PDT 2005


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.




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