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2025-09-15 - 17:42

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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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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.

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 rack7slot3s.osadl.org (updated Thu Sep 11, 2025 03:36:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
911129010,5sleep30-21swapper/302:25:403
1179899962,83cyclictest19376-21fschecks_count02:50:330
1179899851,6cyclictest22144-21tail02:55:560
11798998044,9cyclictest0-21swapper/002:35:250
11798997938,14cyclictest0-21swapper/003:10:260
1179899781,66cyclictest24416-20Xorg03:15:210
1179899761,5cyclictest30423-21basename03:20:300
11798997529,31cyclictest8050irq/56-dwc_otg_03:07:070
11798997529,31cyclictest8050irq/56-dwc_otg_03:07:070
1179899741,4cyclictest17405-21cut02:45:270
1179899741,4cyclictest17405-21cut02:45:270
1179899738,54cyclictest1161-21seq03:29:070
1179899691,5cyclictest0-21swapper/003:31:520
11798996710,36cyclictest17080-21apt02:45:120
1179899651,4cyclictest0-21swapper/003:04:150
1179899611,5cyclictest0-21swapper/002:34:150
1180299548,29cyclictest29205-21ntp_states03:15:353
11800995416,25cyclictest0-21swapper/202:45:262
11800995416,25cyclictest0-21swapper/202:45:262
1179999516,28cyclictest29214-21utempter03:15:351
1180099506,28cyclictest0-21swapper/202:50:302
1180299498,22cyclictest0-21swapper/303:05:233
1180299498,22cyclictest0-21swapper/303:05:233
1179999499,11cyclictest0-21swapper/102:30:261
1179999494,9cyclictest7950irq/56-dwc_otg03:10:261
1180299483,10cyclictest0-21swapper/302:45:233
1180299483,10cyclictest0-21swapper/302:45:233
1179999485,26cyclictest7950irq/56-dwc_otg02:45:401
1179999485,26cyclictest7950irq/56-dwc_otg02:45:401
1180299477,25cyclictest0-21swapper/302:50:303
11799994711,24cyclictest15214-21taskset02:39:401
109072472,37sleep09-21ksoftirqd/002:28:490
11800994623,17cyclictest24714-21x11perf03:05:232
11800994623,17cyclictest24714-21x11perf03:05:232
1180299457,24cyclictest0-21swapper/302:30:283
1180099458,18cyclictest24416-20Xorg03:10:232
1180099456,26cyclictest0-21swapper/202:30:282
1179999449,24cyclictest7950irq/56-dwc_otg03:05:241
1179999449,24cyclictest7950irq/56-dwc_otg03:05:241
1179999443,9cyclictest0-21swapper/103:00:261
11802994315,25cyclictest0-21swapper/302:55:173
1180099436,23cyclictest0-21swapper/203:25:272
1179999436,24cyclictest7950irq/56-dwc_otg03:30:111
1179999427,13cyclictest3065-21cron03:35:121
1179999414,12cyclictest19514-21cat02:50:351
11799994123,10cyclictest17141-21latency_hist02:45:121
269382400,4sleep324416-20Xorg03:10:303
1180299395,5cyclictest1540-21wget03:30:293
1180299381,7cyclictest30599-21fschecks_count03:20:323
11802993815,4cyclictest32397-21fschecks_count03:25:313
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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