kernel.polling and load average

Hi all,
I have kernel with compiled in polling,
and sysctl kern.polling.enable=1 kicks 
load average to stable 1.00
I think I never observe same behavior,
is it meant to be like this or here is something wrong ?
my system is 5.2.1 and I don't have any device
which man polling says it supports.

Thank you,
Putinas