pfSense » pfSense Plus

Dear pfSense-team,

after updating to 2.7.1 i was curious how well the new speed shift GUI entries work.
In fact after adjusting it to per core and a value of 90, i can see my i3-7100U is able to clock somewhat lower and park the cores more often.

One thing in noticed with the command:
sysctl dev.cpu | grep cx_

is, that my CPU supports C1 and C2, but the lowest c-state setting was set to C1 by default:
dev.cpu.0.cx_method: C1/mwait/hwc C2/mwait/hwc
dev.cpu.0.cx_lowest: C1

By adding the following command to the tunables:
hw.acpi.cpu.cx_lowest = C2

I was able to get the CPU to use its C2-states too. Another XEON-pfsense setup was able to use its C3 states as well, by using the commands stated.
One is able to see the usage of c-states with the following command:
sysctl dev.cpu | grep cx_usage

dev.cpu.0.cx_usage_counters: 3717721 111658492
dev.cpu.0.cx_usage: 3.22% 96.77% last 294us

Would it be possible to add a new selection-field to the now existing speedshift-gui in order to be able to select the lowest c-state.
May the selectable values can be parsed from the cpus cabability, which is represented by the values of "dev.cpu.0.cx_method".

Thanks in advance.
Best regards
Dieter