Re: boot-time slowdown for measure_migration_cost

[Prarit Bhargava <prarit@sgi.com>]

Prarit Bhargava wrote:
> Tony,
>
> > Might it be wise to see whether the 2% variation that I saw can be
> > repeated on some other architecture?   Can someone else try
> > this patch and post the before/after values for migration_cost from 
> > dmesg?

Whoops.  Let's try that again:

Pristine (with build_sched_domains measurement):


[    9.942253] Brought up 64 CPUs
[    9.942904] Total of 64 processors activated (143654.91 BogoMIPS).
[    9.943995] build_sched_domains: start
[   32.108439] migration_cost=0,32232,39021
[   37.894391] build_sched_domains: end

Patched (with build_sched_domains measurement):

[    9.942267] Brought up 64 CPUs
[    9.942930] Total of 64 processors activated (143654.91 BogoMIPS).
[    9.944032] build_sched_domains: beginmigration_cost=0,31854,38739
[   23.868304] build_sched_domains: end


P.

>

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