Re: [PATCH 2/3] x86: mm: Change tlb_flushall_shift for IvyBridge

[Ingo Molnar]

* Alex Shi <alex.shi@xxxxxxxxxx> wrote:

> > Building the kernel is obviously a prime workload - and given that 
> > the kernel is active only about 10% of the time for a typical 
> > kernel build, a 1-2% speedup means a 10-20% speedup in kernel 
> > performance (which sounds a bit too good at first glance).
> 
> Maybe a extra time tlb flush causes more tlb refill that cost much 
> user space time.

All these things are measurable, that way maybes can be converted into 
certainty.

Thanks,

	Ingo
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