Re: [PATCH] sched: remove sched_find_first_bit()
From: Ingo Molnar
Date: Tue May 16 2017 - 04:30:56 EST
* Yury Norov <ynorov@xxxxxxxxxxxxxxxxxx> wrote:
> I collected about 700 results in dmesg, and took 600 fastest.
> For the vanilla kernel, the average value is 368, and for patched
> kernel it is 388. It's 5% slower. But the standard deviation is
> really big for both series' - 131 and 106 cycles respectively, which
> is ~ 30%. And so, my conclusion is: there's no benefit in using
> sched_find_first_bit() comparing to find_first_bit().
Erm, so you in essence claim:
"according to measurements the new code is 5% slower, with a high, 30%
stddev, hence the new code is better!"
Basic logic fail...
Thanks,
Ingo