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    SubjectRe: Kernel Boot Speedup
    On Wed, 2003-03-05 at 16:19, Ro0tSiEgE LKML wrote:
    > What are some things I can change/disable/etc. to cut down the boot time
    > of the kernel (i386) ? I would like to get one to boot in a couple
    > seconds, tops. Is this possible, and how?

    To get to that kind of boot-up speed, the best way is to never shutdown.

    On a StrongArm platform I worked on, we managed to put the CPU to sleep
    and the DRAM controller into self-refresh mode and a few other
    housekeeping chores (like checksumming our saved CPU state to be able to
    verify it on resumption), and could spring back to life with the press
    of a power button in about the same amount of time it took for the
    cold-cathode back-light to warm up enough to see the built-in screen.

    On a modern laptop, it may be possible, in theory, to accomplish the
    same kind of thing. The key is to be able to not lose the contents of
    memory. I'm not well versed on current state-of-the-art
    power-management on commodity x86 platforms, so your mileage may vary.

    If you want cold-start boot on a PC, you'll probably need to completely
    skip the BIOS (have a look at LinuxBIOS and/or kexec), skip the probing
    of devices on reboot, and drastically shorten (or run later) any
    user-mode scripts that are invoked.

    On the machines that I have measured (p3-800 and p4-1.7Xeon, a
    well-configured kernel, after subtracting out BIOS time and stupid scsi
    reprobing, is up and open for business in about 10 seconds after the
    LILO handoff. The *system* however, isn't often available for another
    30 or 40 seconds, perhaps longer.


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