Windows 10
A Microsoft operating system that runs on personal computers and tablets.
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Programmatically disable on Windows10 C3, C4, C5, C6 states of CPU
Jiří Mikeska
1
Reputation point
Good day.
I want to programmatically disable on Windows10 C3, C4, C5, C6 states of CPU. I tried this code:
const GUID processor_idle_state_maximum = {0x9943e905, 0x9a30, 0x4ec1, 0x9b, 0x99, 0x44, 0xdd, 0x3b, 0x76, 0xf7, 0xa2};
GUID *scheme;
const DWORD DISABLED = 1;
DWORD error;
error = PowerGetActiveScheme(NULL, &scheme);
error = PowerWriteACValueIndex(NULL, scheme, &GUID_PROCESSOR_SETTINGS_SUBGROUP, &processor_idle_state_maximum, DISABLED);
error = PowerWriteDCValueIndex(NULL, scheme, &GUID_PROCESSOR_SETTINGS_SUBGROUP, &processor_idle_state_maximum, DISABLED);
error = PowerSetActiveScheme(NULL, scheme);
But this does nothing (I checked it in PerfMon.exe). As value DISABLED I tried all possible values from 1 to 20.
And how to disable C2, C3, C4, C5, C6 states of CPU?
{count} votes
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Castorix31 69,256 Reputation points2023-03-12T21:32:52.5866667+00:00 It should be GUID_PROCESSOR_IDLE_DISABLE
Guid PROCESSOR_IDLE_DISABLE disable ALL C-states and set CPU usage to 100% (I already know about this guid and test it). But I want to leave C1 and C2 states enabled as it in my question above.
Does the question work for you? You can try PROCESSOR_POWER_POLICY.
@Xiaopo Yang - MSFT
Regarding function WriteProcessorPwrScheme and similar:
"Starting with Windows Vista, power management configuration of the system's processor is controlled through the GUID_PROCESSOR_SETTINGS_SUBGROUP power settings subgroup."
See Remarks section here https://learn.microsoft.com/en-us/windows/win32/api/powrprof/nf-powrprof-writeprocessorpwrscheme
In my question is Windows 10.
The most possible power setting guid I found is Processor performance core parking maximum and minimum cores.
But this has nothing with C states of processor.
Hello @Jiří Mikeska, I have consulted for this. You may turn to the hardware driver. Processor power management options don't involve in CPU C-states.
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