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    SubjectRe: [RFC PATCH 0/6] module, kbuild: Faster boot with custom kernel.
    On Friday 20 February 2009 11:07:05 Andreas Robinson wrote:
    > 1. Monolithic: 6.27 s, (0.22). bzImg=3419 kB ramfs=515 kB
    > 2. Megamodule: 6.80 s, (0.16). bzImg=2297 kB ramfs=1783 kB
    > 3. Insmod list: 6.83 s, (0.07). bzImg=2297 kB ramfs=1942 kB
    > 10 samples were taken in each case. Standard deviations are in parenthesis.
    > The measured times are printk timestamps from a dummy module inserted last.
    > Reading these benchmark results I can only conclude that my work is
    > useless and life has no meaning.

    I know that feeling! Performance work tends to be like that. I assume this
    is an unpatched kernel, or did you apply some of the stop_machine prevention
    / lock reduction patches?

    > So, what's missing or been done wrong here? I expected the difference
    > between monolithic and modular to be greater to be honest.

    modprobe vs insmod?

    You could try copying /lib/modules/`uname -r`/modules.* and using modprobe,
    see if the slowdown is actually there.

    Thanks for chasing this!

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