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    SubjectRe: About highmem in 2.6
    Dave McCracken wrote:
    > --On Wednesday, February 11, 2004 18:47:04 +0100 Luis Miguel García
    > <ktech@wanadoo.es> wrote:
    >
    >
    >>When I first installed 2.4, someone told me that if I had 1 gb ram it was
    >>better to not use highmem because those extra aditional mb was not worth
    >>the speed penalty of using the feature.
    >>
    >>Sorry for my ignorance (and my sucking english) but must I enable highmem
    >>now with 2.6? or have it any speed penalty althought?
    >
    >
    > I don't know if anyone has actually measured the relative performance, but
    > I'd expect the answer to be the same as 2.4. There is a small but
    > measurable performance penalty for enabling highmem which is higher than
    > the benefit of the extra 128 meg of memory you get when you have 1G. If
    > you have more than 1G it's better to enable highmem.
    >

    I've been using this patch for a while now on my box (with 1GB):
    http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa1/00_3.5G-address-space-5
    (kernel is 'vanilla' otherwise)

    This allows you to use your full 1GB w/out highmem support.... (2G/2G
    user/kernel addr space split, or something..)

    Anything (potentially) wrong/bad about this patch??

    Is there a simmilar patch for 2.6??

    Rgds,
    Mark.

    pls. CC in reply, I'm not on the list....
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