Boot speedup with readahead

[Michel Salim]

On Sun, Sep 7, 2008 at 6:38 PM, Vasile Gaburici <vgaburici at gmail.com> wrote:
> On Mon, Sep 8, 2008 at 1:26 AM, John Reiser <jreiser at bitwagon.com> wrote:
>> drago01 wrote:
>>> On Sun, Sep 7, 2008 at 6:21 AM, Arjan van de Ven <arjan at infradead.org> wrote:
>>   [snip]
>>>> for those who are going to the plumbers conference... Auke Kok and I
>>>> will present there on how to make a Fedora based system boot in 5
>>>> seconds...
>>>>
>>>> and yes a form of readahead was needed to achieve that ;-)
>>>
>>> wtf?
>>> without a custom kernel I doubt that this is possible....
>>
>> Shut down and boot an Apple Macintosh running current OS X 10.5.4.
>> As part of shutting down, it builds a RAM disk of what will be needed
>> at next boot, then saves the RAM disk to hard disk.  (I have not seen
>> the work by Arjan+Auke, but I boot many kinds of systems.)
>
> Interesting, so it's almost a hibernate in disguise. (I haven't
> touched a Mac since 10.4)

More like a "JIT"-optimized initrd, perhaps.

10.5 has some interesting optimizations, though the stricter-checking
fsck is really annoying. But that's not a discussion to have here.

-- 
Michel Salim
http://hircus.jaiku.com/