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  Fix power calibration failing due to DCGM resource contention

  mchus released this 2026-04-14 20:41:17 +03:00 | 178 commits to main since this release

  When a targeted_power attempt is cancelled (e.g. after sw_thermal
  throttle), nv-hostengine holds the diagnostic slot asynchronously.
  The next attempt immediately received DCGM_ST_IN_USE (exit 222)
  and incorrectly derated the power limit.

  Now: exit 222 is detected via isDCGMResourceBusy and triggers an
  exponential back-off retry at the same power limit (1s, 2s, 4s, …
  up to 256s). Once the back-off delay would exceed 300s the
  calibration fails, indicating the slot is persistently held.

  Co-Authored-By: Claude Sonnet 4.6 noreply@anthropic.com

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