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    SubjectRe: AGP and PAT (induced?) problem (on AMD family 6)
    On 06-08-08 15:51, Andreas Herrmann wrote:

    > On Mon, Aug 04, 2008 at 06:30:32PM +0200, Rene Herman wrote:
    >> What _does_ solve this though is booting with the "nopat" command line
    >> parameter. I'm on 2.6.26.1 and have enabled PAT for my AMD Duron myself.
    >> With "nopat", there's no problem to be seen anymore -- exiting X
    >> specifically is instantaneous.
    >>
    >> With or without PAT, my /proc/mtrr is always:
    >>
    >> reg00: base=0x00000000 ( 0MB), size= 512MB: write-back, count=1
    >> reg01: base=0x20000000 ( 512MB), size= 256MB: write-back, count=1
    >> reg02: base=0xe8000000 (3712MB), size= 64MB: write-combining, count=1
    >>
    >> under X joined by:
    >>
    >> reg03: base=0xe4000000 (3648MB), size= 32MB: write-combining, count=2
    >
    > To get some more debug data, can you please retest with latest kernel
    > (2.6.27-rc2)

    Problem present on vanilla -rc2.

    > using "debugpat" kernel option and provide dmesg output

    No... my kernel message buffer isn't large enough for that :-(

    Right, I guess I now know where the delay is coming from. I suppose this
    is not expected. dmesg as captured after starting X and without
    "debugpat" at:

    http://members.home.nl/rene.herman/pat/dmesg.x

    Truncated dmesg with "debugpat":

    http://members.home.nl/rene.herman/pat/dmesg.x.debugpat

    > plus contents of <debugfs>/x86/pat_memtype_list?

    Before starting X (1K):

    http://members.home.nl/rene.herman/pat/pat_memtype_list.console.debugpat

    After starting X (625K):

    http://members.home.nl/rene.herman/pat/pat_memtype_list.x.debugpat

    (This is with 64MB AGP memory)

    More data:

    http://members.home.nl/rene.herman/pat/config-2.6.27-rc2-current
    http://members.home.nl/rene.herman/pat/xorg.conf
    http://members.home.nl/rene.herman/pat/Xorg.0.log

    Thanks,
    Rene


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