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    SubjectRe: [patch 7/7] Add documentation for extended crashkernel syntax
    * Pavel Machek <pavel@ucw.cz> [2007-09-18 19:21]:
    > > This adds the documentation for the extended crashkernel syntax into
    > > Documentation/kdump/kdump.txt.
    >
    > Should you also update kernel-parameters.txt?

    Ok, I'll do.

    > > +For example:
    > > +
    > > + crashkernel=512M-2G:64M,2G-:128M
    > > +
    > > +This would mean:
    > > +
    > > + 1) if the RAM is smaller than 512M, then don't reserve anything
    > > + (this is the "rescue" case)
    > > + 2) if the RAM size is between 512M and 2G, then reserve 64M
    > > + 3) if the RAM size is larger than 2G, then reserve 128M
    >
    > Why is this useful? I mean... if 64M is enough to save a dump, why use
    > 128M? ...or does the required size somehow scale with memory in
    > machine? (pagetables?)

    A bit, yes (ELF core headers, DISCONT memory, per-CPU data), but
    consider also that saving may be faster if you have more RAM (e.g.
    saving over SSH, encryption, ...).


    Thanks,
    Bernhard
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