Cyan Skillfish GPU governor

GPU governor for the AMD Cyan Skillfish APU. Continously maintains a target frequency, and adjusts the actual GPU frequency when the deviation is too great. If the CPU is continously busy for too long, ramps up the target frequency rapidly.

Takes a TOML config file path as its only argument. Keys are:

• timing
  • intervals: in µs
    • sample: how often to sample GPU load (it's a single bit, so needs to be sampled more often than you'd think)
    • adjust: how often to consider adjusting the frequency
    • finetune how long since the last adjustment to consider making a fine-tuning adjustment
  • burst-samples: while the GPU has been busy for this many samples in a row, enter "burst mode", increasing the frequency at the timing.ramp_rates.burst rate. Set to 0 to disable burst mode.
  • ramp_rates: how quickly to increase/decrease GPU frequency, in MHz/ms
    • normal: ramp rate for normal adjustments
    • burst: ramp rate in burst mode
• frequency-thresholds: in MHz
  • adjust: how large a proposed adjustment must be to actually be carried out
  • finetune: how large a fine-tuning adjustment must be to be actually carried out
• load-target: as a fraction
  • upper: GPU load above which target frequency is increased
  • lower: GPU load below which target frequency is decreased
• safe-points: known safe/stable power points, array of tables with two keys:
  • frequency: GPU frequency in MHz
  • voltage: GPU supply voltage in mV

See also default-config.toml.