Re: [PATCH 2/3] x86: mm: Change tlb_flushall_shift for IvyBridge
From: Ingo Molnar
Date: Tue Dec 17 2013 - 08:15:11 EST
* 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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