Messages in this thread | | | Subject | Re: faster boots? | From | (Eric W. Biederman) | Date | 04 Apr 2002 23:14:12 -0700 |
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> > I find that on heavily scsi systems: one machine spins each of 13 disks > > up sequentially. This makes the initial boot take 3-5 minutes before > > init even gets its foot in the door. If someone made a patch to spin > > up scsi disks on the first access, I'd gladly give it a test. ;-) > > Ditto. Especially if it spun them down again when idle for a while. > > The scsi layer does several things serially it could parallelise. It isnt > just disk spin up its also things like initialising all scsi controllers > in parallel.
I'm interested in this kind of thing too. Though I am wondering if the IDE layer has the same kind of issues. I notice because the kernel initialization time is 50% of my boot time. I have the kernel loaded 3 seconds from power on...
My impression is that the time during kernel initialization is either spent spinning up disks or in a million device probes and things going on behind the scenes. I haven't had a chance to look farther though.
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