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    SubjectRe: 2.6.16-rc5 huge memory detection regression
    BTW, BIOS during the POST test shows all 16GB, it is only 
    linux-2.6.16-rc5 who get's it wrong. Even the summary window
    provided by BIOS just before grub gets loaded shows 16GB of RAM.
    I don't believe it is anything else then the kernel.

    Andrew Morton wrote:
    > Martin MOKREJ__ <mmokrejs@ribosome.natur.cuni.cz> wrote:
    >
    >> I just tested 2.6.16-rc5 kernel on MSI 9136 dual Xeon server
    >> motherboard with 16 GB of memory and the kernel detects only 8 GB of
    >> RAM instead. 2.6.15 kernel detected properly 16 GB. I haven't tested
    >> any kernel revisions in between these two, but could if you point me
    >> in a specific direction. Attaching diff(1) output of dmesg(1) outputs.
    >> Please Cc: me in replies. Thanks!
    >> Martin
    >>
    >>
    >>[boot-2.6.15_to_16-rc5.diff text/plain (12156 bytes)]
    >
    >
    > The diff is useful.
    >
    >
    >> --- tmp/boot-2.6.15.txt 2006-03-07 11:45:48.015509048 +0100
    >> +++ tmp/boot-2.6.16-rc5.txt 2006-03-07 11:45:48.029506920 +0100
    >> @@ -1,4 +1,4 @@
    >> -Linux version 2.6.15 (root@phylo) (gcc version 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0, pie-8.7.9)) #1 SMP Mon Mar 6 20:20:06 MET 2006
    >> +Linux version 2.6.16-rc5 (root@phylo) (gcc version 3.4.5 (Gentoo 3.4.5-r1, ssp-3.4.5-1.0, pie-8.7.9)) #1 SMP Mon Mar 6 19:58:24 MET 2006
    >> BIOS-provided physical RAM map:
    >> BIOS-e820: 0000000000000000 - 000000000009a800 (usable)
    >> BIOS-e820: 000000000009a800 - 00000000000a0000 (reserved)
    >> @@ -12,16 +12,16 @@
    >> BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved)
    >> BIOS-e820: 00000000ff800000 - 00000000ffc00000 (reserved)
    >> BIOS-e820: 00000000fffffc00 - 0000000100000000 (reserved)
    >> - BIOS-e820: 0000000100000000 - 0000000430000000 (usable)
    >> -16256MB HIGHMEM available.
    >> + BIOS-e820: 0000000100000000 - 0000000230000000 (usable)
    >> +8064MB HIGHMEM available.
    >
    >
    > These numbers are what the BIOS is telling the kernel about your machine.
    > Was the BIOS changed?
    >
    > If not, you might need to wiggle those DIMMs or something.
    -
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