Re: [PATCH] x86: use cpufreq_quick_get() for /proc/cpuinfo "cpu MHz" again
From: Thomas Gleixner
Date: Tue Nov 14 2017 - 18:54:05 EST
On Tue, 14 Nov 2017, Linus Torvalds wrote:
> On Tue, Nov 14, 2017 at 2:47 PM, Rafael J. Wysocki <rjw@xxxxxxxxxxxxx> wrote:
> >
> > So what about the one below? It works for me as expected.
>
> Can somebody with 100+ cores test this? Ingo? You had a 160 core
> machine that took forever, didn't you..
On a 144 CPUs machine:
time cat /proc/cpuinfo >/dev/null
Current head:
real 0m0.003s
user 0m0.000s
sys 0m0.002s
Current head + Raphaels patch:
real 0m0.029s
user 0m0.000s
sys 0m0.010s
So that patch is actually slower.
Thanks,
tglx