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    SubjectRe: mem=16MB laptop testing
    Hi!

    > > (c) mem= no longer bounds the highest physical address, but rather
    > > the sum of memory in e820 entries post-sanitization. This
    > > means a ZONE_NORMAL with about 384KB showed up, with duly
    > > perverse heuristic consequences for page_alloc.c
    >
    > I don't understand this. You mean almost all memory was in ZONE_DMA?
    >
    > "mem=" does not accurately emulate having that much memory. So a 512M box
    > booted with "mem=256M" has a different amount of memory from a 256M box
    > booted with no "mem=" option. It would be nice to fix that, but I've never
    > looked into it.

    I do not think this wants to be fixed. It should remain compatible
    with 2.4.X, and if it is not that's a bug [and pretty dangerous & hard
    to debug one -- if you mark something as ram which is not, you get
    real bad data corruption].

    Pavel

    --
    When do you have a heart between your knees?
    [Johanka's followup: and *two* hearts?]
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