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2026-01-03 - 05:40

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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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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 rack3slot3s.osadl.org (updated Sat Jan 03, 2026 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
241922521450,1sleep20-21swapper/219:45:192
2376557212558,62sleep30-21swapper/319:06:363
23764992113104,6sleep10-21swapper/119:05:541
237650329063,19sleep00-21swapper/019:05:570
237676927851,10sleep20-21swapper/219:09:202
26422432230,11sleep134-21ksoftirqd/123:20:001
2376948992219,1cyclictest0-21swapper/321:55:253
237694899221,17cyclictest2520729-21taskset21:20:263
237694899211,15cyclictest0-21swapper/320:35:133
237694899202,12cyclictest2715030-21taskset00:25:193
2376948992018,1cyclictest0-21swapper/319:40:013
2376948992017,1cyclictest0-21swapper/300:20:133
2376948992017,1cyclictest0-21swapper/300:15:013
237694899201,15cyclictest2694383-21taskset00:05:323
2376948992010,7cyclictest2673046-21taskset23:45:273
26850822190,11sleep014-21ksoftirqd/000:00:160
237694899196,6cyclictest2494621-21taskset20:57:423
2376948991916,1cyclictest0-21swapper/319:45:183
237694899191,14cyclictest2621311-21taskset23:00:113
237694899191,14cyclictest0-21swapper/319:50:123
237694899191,11cyclictest2534688-21taskset21:35:173
25572322181,12sleep12557281-21ntpq21:55:201
2376948991815,1cyclictest0-21swapper/321:50:163
2376948991815,1cyclictest0-21swapper/321:10:163
2376948991815,1cyclictest0-21swapper/320:45:143
237694899181,14cyclictest0-21swapper/323:25:123
2376948991811,3cyclictest25624222sleep322:00:203
237694899181,13cyclictest0-21swapper/322:25:113
237694899181,13cyclictest0-21swapper/321:40:173
237694899181,11cyclictest2430281-21taskset19:55:173
25411022171,10sleep22541149-21ntpq21:40:182
24901852171,7sleep02490382-21if_enp1s020:55:150
2376948991715,1cyclictest0-21swapper/321:05:163
2376948991714,1cyclictest0-21swapper/323:15:183
2376948991714,1cyclictest0-21swapper/322:30:163
2376948991714,1cyclictest0-21swapper/300:00:143
2376948991713,2cyclictest0-21swapper/319:30:163
237694899171,13cyclictest0-21swapper/319:15:113
237694899171,10cyclictest2720440-21chrt00:30:283
237694899171,10cyclictest2604182-21taskset22:40:183
237694899171,10cyclictest2526352-21taskset21:30:003
237694899171,10cyclictest2442403-21taskset20:10:003
237694899170,10cyclictest2456714-21taskset20:20:183
25595322161,10sleep02561242-21tr22:00:160
237694899161,9cyclictest2579399-21taskset22:20:063
2376948991614,1cyclictest0-21swapper/320:10:253
2376948991614,1cyclictest0-21swapper/319:25:143
2376948991613,1cyclictest0-21swapper/323:20:173
2376948991613,1cyclictest0-21swapper/323:05:173
2376948991613,1cyclictest0-21swapper/322:55:143
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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