Re: [PATCH] Do not force shutdown/reboot to boot cpu.

[H. Peter Anvin]

On 04/10/2013 09:59 AM, Ingo Molnar wrote:
> 
> 4 minutes bootup is 240 seconds, with 1024 CPUs that's about 240 msecs per CPU.
> 
> That sounds a lot, given that unlike bootup there's not much real work to be done 
> during shutdown - we don't initialize anything, etc.
> 
> Maybe much of those 240 msecs are spent in some stupid udelay loop or so, which 
> could be made parallel?
> 

I wonder if it isn't calling stop_machine() 1024 times, each time
rendezvousing all the still-active CPUs.

	-hpa


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