IDEA: Shortening boot-time

[Hans de Goede]

Alan Cox wrote:
>>A better fix to the whole usb thing however would be for the kernel usb 
>>system to be able to tell userland that the initial usb enumeration is 
>>done and use this completion signal instead of the ridiculous sleep. 
>>Alan is this possible?
> 
> 
> You can run the entire usb setup asynchronously if you want (the sleep
> included). There are certain things the kernel does partially serialize
> like scsi enumerators that limit parallelising but I don't see any in USB
> 
The sleep is to make sure the enumeration has completed because the rest 
of rc.sysinit might need usb devices, like keyb for fsck, or an usb 
attached storage device for fsck and mount, etc.

Because of these dependencies parralellisation really isn't any help. 
Getting a signal that the kernel has completed its initial scan of all 
the usb busses however would be a bug help, because I believe the 
current sleep 5 is much longer then is needed on most systems.

Regards,

Hans


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