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2026-03-13 - 06:13

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, slot #7

Rack #0/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #1/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #2/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #3/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #4/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #5/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #6/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #7/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #8/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #9/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #a/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #b/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #c/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #d/#0 #1 #2 #3 #4 #5 #6 #7 #8 -
Rack #e/#0 #1 #2 #3 #4 #5 #6 #7 #8 - Rack #f/#0 #1 #2 #3 #4 #5 #6 #7 #8 
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Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

Data to construct the above plot have been generated using the RT test utility cyclictest.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rackcslot7s.osadl.org (updated Fri Mar 13, 2026 00:44:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
137039299473454,16cyclictest1386690-21turbostat19:54:593
137039299473454,16cyclictest1386690-21turbostat19:54:593
137039299466457,6cyclictest1452542-21turbostat23:00:003
137039299466457,6cyclictest1452542-21turbostat23:00:003
137038799466446,17cyclictest1449072-21turbostat22:54:552
137039299465455,7cyclictest1374572-21turbostat19:20:003
137039299463455,4cyclictest1445622-21turbostat22:40:003
137039299463442,17cyclictest1372052-21turbostat19:15:003
137038799462453,6cyclictest1479124-21turbostat00:19:542
137039299461454,4cyclictest1441859-21turbostat22:30:003
137039299460453,4cyclictest1424255-21turbostat21:40:013
137038799458434,21cyclictest1480853-21turbostat00:24:552
137039299457450,4cyclictest1395648-21turbostat20:19:593
137039299457449,5cyclictest1420789-21turbostat21:30:003
137039299457435,19cyclictest1468420-21turbostat23:49:563
137039299453446,4cyclictest1404612-21turbostat20:45:003
137039299453445,5cyclictest1399414-21turbostat20:30:013
137039299445438,4cyclictest1436658-21turbostat22:15:003
137039299444436,5cyclictest1406645-21turbostat20:50:003
137038799444437,4cyclictest1393920-21turbostat20:19:552
137039299442433,6cyclictest1379775-21turbostat19:39:553
137039299441434,4cyclictest1484324-21turbostat00:30:003
137039299439432,4cyclictest1397692-21turbostat20:25:003
137039299439430,6cyclictest1440115-21turbostat22:25:003
137039299438431,4cyclictest1458033-21turbostat23:19:553
137039299438428,6cyclictest1388424-21turbostat19:59:593
137039299437430,4cyclictest1473921-21turbostat00:00:013
137039299436415,18cyclictest1378038-21turbostat19:30:003
137039299434427,4cyclictest1393920-21turbostat20:15:003
137039299434427,4cyclictest1393920-21turbostat20:15:003
137039299434426,5cyclictest1450817-21turbostat22:55:003
137039299433425,5cyclictest1415601-21turbostat21:19:553
137039299433425,5cyclictest1378038-21turbostat19:34:553
137039299432410,19cyclictest1412139-21turbostat21:09:553
137039299431423,5cyclictest1447352-21turbostat22:45:003
137039299427420,4cyclictest1410403-21turbostat21:00:003
137039299427419,5cyclictest1432910-21turbostat22:09:553
137039299427419,5cyclictest1383236-21turbostat19:49:553
137039299424405,16cyclictest1466684-21turbostat23:44:553
137039299423416,4cyclictest1415601-21turbostat21:15:013
137039299423405,15cyclictest1464962-21turbostat23:39:553
137038799423416,4cyclictest1376308-21turbostat19:29:562
137039299422412,6cyclictest1402881-21turbostat20:40:003
137039299422412,6cyclictest1402881-21turbostat20:40:003
137038299422414,5cyclictest1440115-21turbostat22:29:550
137039299421413,5cyclictest1456306-21turbostat23:10:003
137039299419399,17cyclictest1486055-21turbostat00:35:003
137039299419399,17cyclictest1486055-21turbostat00:35:003
137038299419412,4cyclictest1436658-21turbostat22:19:550
137039299417408,6cyclictest1482588-21turbostat00:25:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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