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    SubjectRe: [PATCH] x86_32: trim memory by updating e820 v3
    Gabriel C wrote:
    > Yinghai Lu wrote:
    >> On Mon, Apr 28, 2008 at 7:24 AM, Gabriel C <nix.or.die@googlemail.com> wrote:
    >>> Mika Fischer wrote:
    >>> > Hi Ingo,
    >>> >
    >>> > I'm having the same problem.
    >>> >
    >>> > Ingo Molnar schrieb:
    >>> >> excellent. So just to make sure: this box never had proper graphics
    >>> >> under Linux (under no previous kernel), due to the way the BIOS has set
    >>> >> up the MTRR's, right?
    >>> >
    >>> > Well, not quite. X still works fine, but since the video memory is
    >>> > overlapped by two of the existing MTRRs, X cannot add a write-combining
    >>> > range for the video memory. That makes X rather slow especially if you
    >>> > use DRI for Compiz etc.
    >>>
    >>> Well you are lucky then :)
    >>>
    >>> Yeah X 'worked' but it worked as slow as with vesa video driver here.
    >> [ 0.000000] rangeX: 0000000000000000 - 00000000d0000000
    >> [ 0.000000] Setting variable MTRR 0, base: 0MB, range: 2048MB, type WB
    >> [ 0.000000] Setting variable MTRR 1, base: 2048MB, range: 1024MB, type WB
    >> [ 0.000000] Setting variable MTRR 2, base: 3072MB, range: 256MB, type WB
    >> [ 0.000000] range0: 00000000cf800000 - 00000000cf800000
    >> [ 0.000000] range: 00000000cf800000 - 00000000d0000000
    >> [ 0.000000] Setting variable MTRR 3, base: 3320MB, range: 8MB, type WB
    >> [ 0.000000] range0: 0000000100000000 - 0000000120000000
    >> [ 0.000000] Setting variable MTRR 4, base: 4096MB, range: 512MB, type WB
    >> [ 0.000000] range: 0000000120000000 - 0000000130000000
    >> [ 0.000000] Setting variable MTRR 5, base: 4608MB, range: 256MB, type WB
    >> [ 0.000000] hole: 000000012c000000 - 0000000130000000
    >> [ 0.000000] Setting variable MTRR 6, base: 4800MB, range: 64MB, type UC
    >>
    >> so your X server need two entries for WB?
    >>
    >> can you send out /proc/mtrr with booting with disable_mtrr_cleanup?
    >
    > I can just not right now , cannot reboot the box yet. In about 1h or so , maybe less.

    Here the output with v3 which is disabled by default:

    --($:~)-- cat /proc/mtrr
    reg00: base=0xd0000000 (3328MB), size= 256MB: uncachable, count=1
    reg01: base=0xe0000000 (3584MB), size= 512MB: uncachable, count=1
    reg02: base=0x00000000 ( 0MB), size=4096MB: write-back, count=1
    reg03: base=0x100000000 (4096MB), size= 512MB: write-back, count=1
    reg04: base=0x120000000 (4608MB), size= 128MB: write-back, count=1
    reg05: base=0x128000000 (4736MB), size= 64MB: write-back, count=1
    reg06: base=0xcf600000 (3318MB), size= 2MB: uncachable, count=1

    dmesg is saying now :

    [ 22.764595] mtrr: type mismatch for d0000000,10000000 old: write-back new: write-combining


    My card settings in BIOS ( that was default ) are the following :

    DVMT Mode -> DVMT Mode ( possible setting DVMT Mode or Fixed Mode )
    DVMT / Memory -> 256MB ( possible settings 128/256 MB or Maximum DVMT )

    Initiate Graphics Adapter -> PEG/PCI ( possible settings IGD , PCI/IGD , PCI/PEG , PEG/IGD )
    Internal Graphics Mode Select -> Enabled,8MB ( possible settings Enabled,8MB , Enabled,1MB maybe Disabled I forgot to look)
    PEG Port -> Auto ( possible settings Auto , Disabled )
    PEG Port Force x1 -> Disabled ( possible settings Enabled , Disabled )

    Of course these settings are only possible when the card is not disabled :)

    I'm gonna try v4 now and enable it. Please let me know if you need more infos.

    Gabriel


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