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    SubjectRe: swapper: page allocation failure.
    Date

    ----- Original Message -----
    From: "Chris Wedgwood" <cw@f00f.org>
    To: "Haar J?nos" <djani22@netcenter.hu>
    Cc: <linux-kernel@vger.kernel.org>
    Sent: Sunday, May 21, 2006 12:24 PM
    Subject: Re: swapper: page allocation failure.


    > On Sun, May 21, 2006 at 11:31:12AM +0200, Haar J?nos wrote:
    >
    > > 1. why don't use highmem for caching?
    > > 2. why can not allocate enough lowmem from shared-buffer for the e1000
    > > driver if it needs some memory?
    >
    > highmem can't be used as freely as lowmem, it has additional
    > complexity and a slight over head that makes it hard or impossible to
    > use in many places

    OK, i understand this, but buffer-cache is an optional thing, and looks like
    really simple (for me), and i cannot understand why cannot use exactly for
    buffering the highmem...

    On my concentrator the nbd-client uses ~ 3.5GB of ram for PAGE-cache.
    The buffer cache why can not use the highmem?
    Whats the difference?

    Cheers,
    Janos

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