On Thu, Aug 17, 2006 at 12:54:18PM -0400, Rick Spillane wrote:
> I was wondering why this phase of the boot process is so slow. Is
> there some way I can speed it up? If there is some configuration I can
> tweak to skip this step, that would be great, if it would require
> changing a lot of kernel source or what-not, then just tell me that
> also, and I will live with it. Any explanation as to why this is so
> slow though would be greatly appreciated.
It creates a hell of a lot of short-lived processes. Process creation
is slow for UML, so this makes this part of the boot particularly
slow.
I do have a patch in my tree which speeds up fork by removing the
signal delivery that was used to initialize the new kernel stack.
This gives a speedup on the order of 5% on fork, which you probably
wouldn't notice watching a boot.
The next thing I'm going to look at is avoiding the page table scan
that happens before the new process starts up. That has a better
chance of being noticable.
Jeff
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