Re: faster boots?

Luigi Genoni
2002-04-05T15:14:33Z

What is really noisy is the scsi boot on some server, when you have 4 or
more disks and some other stuff, like on some of my sparc64.
Sometimes It can happen that a reboot asks some minute just for all scsi
and fibbre stuff. If you have MC^2 and some logical volume around on it,
it can be really noisy, especially if you are in a hurry, as always
when it comes to production servers :(.

On desktop PC kernel boot is hardly a problem, the real
slowdown are the init script, but then every distribution
has its own (slower or faster).

On Fri, 5 Apr 2002, Helge Hafting wrote:

> joeja@mindspring.com wrote:
> >
> > Think pre init scripts....
> >
> > no apache was install on this machine, no iptables scripts, etc.
> >
> > I'm actually talking about the time from where Linux spits out all this crap about probing irq's, ide drive found with dma etc. That kind of stuff.
>
> Compile your own kernel with drivers only for hardware you
> actually have and use during boot. Omit all other drivers. That gets
> rid
> of a lot of probing, and the time from "kernel loaded" to "starting
> init"
> gets quite short. Also, some drivers lets you specify irq's etc.
> on the kernel command line - that may avoid further probing.
>
> Drivers for things not needed in the kernel boot process (cdrom, floppy,
> ethernet, etc.) can be made modular. That avoids time-consuming cd
> spinup
> and probing of non-boot devices.
>
> The kernel boot is only a few seconds on my office machine. The bios
> boot is one long delay, the initscripts another.
>
> Helge Hafting
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