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    SubjectRe: [BUG 2.6.29_rc8] BIOS Bug: CPU MTRRs don't cover all of memory, losing 0MB of RAM.
    Yinghai Lu wrote:

    > please check
    >
    > [PATCH] x86: workaround system with strange var MTRR
    >

    Thanks for your interest.

    Oops is now replaced with a warning after applying the patch on top of tip/master.

    BTW, do that kind of BIOS bugs have a negative impact on the performance of the system?


    I'm sending the head of dmesg. And also I just noticed that there were MTRR related
    stuff at the tail of the log buffer(with/without the patch). I'm posting them also:

    --

    MTRR default type: uncachable
    MTRR fixed ranges enabled:
    00000-9FFFF write-back
    A0000-BFFFF uncachable
    C0000-FFFFF write-protect
    MTRR variable ranges enabled:
    0 base 0000000000 mask 0000000000 write-back
    1 base 00CFF00000 mask FFFFF00000 uncachable
    2 base 00D0000000 mask FFF0000000 uncachable
    3 base 00E0000000 mask FFE0000000 uncachable
    4 base 0000004000 mask FFFFFFF000 uncachable
    5 base 0000005000 mask FFFFFFF000 uncachable
    6 base 0000006000 mask FFFFFFF000 uncachable
    7 base 0000007000 mask FFFFFFF000 uncachable
    x86 PAT enabled: cpu 0, old 0x7040600070406, new 0x7010600070106
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
    WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
    WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
    WARNING: BIOS bug: VAR MTRR contains strange UC entry under 1M, check with your system vendor!
    e820 update range: 00000000cff00000 - 0000000100000000 (usable) ==> (reserved)
    init_memory_mapping: 0000000000000000-00000000379fe000
    0000000000 - 0000200000 page 4k
    0000200000 - 0037800000 page 2M
    0037800000 - 00379fe000 page 4k
    ...
    ...
    ...
    ...
    NET: Registered protocol family 10
    lo: Disabled Privacy Extensions
    ADDRCONF(NETDEV_UP): eth1: link is not ready
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    bnx2: eth1 NIC Copper Link is Up, 1000 Mbps full duplex, receive & transmit flow control ON
    ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    mtrr: type mismatch for d8000000,4000000 old: write-back new: write-combining
    get_mtrr: cpu0 reg00 base=0000000000 size=0010000000 write-back
    get_mtrr: cpu0 reg01 base=00000cff00 size=0000000100 uncachable
    get_mtrr: cpu0 reg02 base=00000d0000 size=0000010000 uncachable
    get_mtrr: cpu0 reg03 base=00000e0000 size=0000020000 uncachable
    get_mtrr: cpu0 reg04 base=0000000004 size=0000000001 uncachable
    get_mtrr: cpu0 reg05 base=0000000005 size=0000000001 uncachable
    get_mtrr: cpu0 reg06 base=0000000006 size=0000000001 uncachable
    get_mtrr: cpu0 reg07 base=0000000007 size=0000000001 uncachable

    --

    Ozan Çağlayan
    <ozan_at_pardus.org.tr>
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