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    SubjectRe: HIGHMEM=4G slows down ps2pdf with 2.4.28
    On Fri, Dec 03, 2004 at 09:58:19PM +0100, Alain Tesio wrote:
    > On Thu, 2 Dec 2004 17:08:15 -0200
    > Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
    >
    > > On Wed, Dec 01, 2004 at 11:25:22PM +0100, Alain Tesio wrote:
    > > > Hi,
    > > >
    > > > With a 2.4.28 kernel, 1.5 Go RAM and nothing exotic, everything works fine
    > > > with CONFIG_HIGHMEM4G and CONFIG_HIGHMEM=y except that
    > > > ps2pdf is about 30 times slower
    >
    > > How does /proc/mtrr look like?
    > >
    > > Maybe some of your memory is configured as uncacheable.
    >
    > reg00: base=0x00000000 ( 0MB), size=1024MB: write-back, count=1
    > reg01: base=0x40000000 (1024MB), size= 256MB: write-back, count=1
    > reg02: base=0x50000000 (1280MB), size= 128MB: write-back, count=1
    > reg03: base=0x58000000 (1408MB), size= 64MB: write-back, count=1
    > reg04: base=0x5c000000 (1472MB), size= 32MB: write-back, count=1
    > reg05: base=0x5e000000 (1504MB), size= 16MB: write-back, count=1
    >
    > I don't think that the hosting company played with the bios settings,
    > and I don't do anything special with memory.

    Alain,

    All memory is correctly configured in MTRR it seems (all of it is write-back cacheable).

    Do you have CONFIG_HIGHIO=y ? That might help a lot. The kernel has to use
    bounce buffers for IO otherwise.

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