Speed tolerance based on present speed instead of top speed

[Meliusja]

    if(settings.spindle.at_speed_tolerance > 0.0f) {
        spindle_data.rpm_low_limit = rpm / (1.0f + settings.spindle.at_speed_tolerance);
        spindle_data.rpm_high_limit = rpm * (1.0f + settings.spindle.at_speed_tolerance);
    }

This code from huanyang.c applies speed tolerance percentage to the present speed setpoint which implies that speed accuracy of VFDs improve as the speed decreases. For example a 10000 RPM motor with a 1% speed tolerance would be +/- 100 RPM at 10000RPM but +/- 10 RPM at 1000RPM. The physics governing speed accuracy on VFDs cause the the speed accuracy to be the same or worse as the speed decreases. I believe the speed tolerance should always be based on percentage of top speed.
Thanks,
Jeff

[terjeio]

I believe the speed tolerance should always be based on percentage of top speed.

I do not believe so - but maybe there is a case for making it configurable?