US 12,001,254 B2
Detection of feedback control instability in computing device thermal control
James Rohrkemper, Harbor Springs, MI (US); Sanjeev R. Sondur, Horsham, PA (US); Kenny C. Gross, Escondido, CA (US); and Guang C. Wang, San Diego, CA (US)
Assigned to Oracle International Corporation, Redwood Shores, CA (US)
Filed by ORACLE INTERNATIONAL CORPORATION, Redwood Shores, CA (US)
Filed on Nov. 2, 2021, as Appl. No. 17/516,975.
Prior Publication US 2023/0135691 A1, May 4, 2023
Int. Cl. G06F 1/20 (2006.01); H05K 7/20 (2006.01)
CPC G06F 1/206 (2013.01) [H05K 7/20136 (2013.01); H05K 7/20718 (2013.01); H05K 7/20836 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method to detect feedback control instability in thermal control, the method comprising:
for a set of dwell time intervals, wherein the dwell time intervals are associated with a range of periods of time from an initial period to a base period,
executing a workload that varies from minimum to maximum over the period of time on a computing device during the dwell time interval;
recording telemetry data from the computing device during execution of the workload;
incrementing the period towards a base period;
determining that either the base period is reached or a thermal inertia threshold is reached; and
analyzing the recorded telemetry data over the set of dwell time intervals to either (i) detect presence of a feedback control instability in thermal control for the computing device; or (ii) confirm feedback control stability in thermal control for the computing device.