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2025-11-30 - 13:37

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 Sun Nov 30, 2025 00:43:36)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2318999017,35cyclictest9-21ksoftirqd/022:20:230
231899765,59cyclictest0-21swapper/000:05:230
13092760,2sleep10-21swapper/120:35:301
13092760,2sleep10-21swapper/120:35:301
4572740,4sleep2452-21sensors21:35:362
231899747,27cyclictest0-21swapper/000:35:250
231899733,23cyclictest0-21swapper/021:20:230
110022730,6sleep1231999cyclictest23:19:261
231899725,14cyclictest0-21swapper/022:10:240
2318997211,18cyclictest17365-21ssh21:15:240
2318997211,18cyclictest17365-21ssh21:15:240
34982700,3sleep09-21ksoftirqd/021:40:300
270452700,1sleep10-21swapper/121:27:501
231899692,44cyclictest0-21swapper/000:25:260
231899692,42cyclictest2055-21sed20:35:390
231899692,42cyclictest2055-21sed20:35:390
2318996915,33cyclictest13-21rcuc/022:25:270
175282690,5sleep0231899cyclictest22:44:590
232099675,42cyclictest0-21swapper/221:05:302
232099673,41cyclictest28550-21/usr/sbin/munin22:15:242
232099662,5cyclictest4631-21sed22:25:392
231999664,14cyclictest17645-21ssh22:00:241
232099658,27cyclictest7850irq/56-dwc_otg_00:30:222
231899653,9cyclictest0-21swapper/022:30:240
2318996537,5cyclictest22498-21ntpq22:50:350
2318996531,13cyclictest11165-21latency_hist19:35:100
231899641,36cyclictest18817-21munin-plugin-st23:30:100
231899641,31cyclictest0-21swapper/023:55:220
2318996333,4cyclictest0-21swapper/019:45:250
231899631,37cyclictest3464-21unixbench_multi19:10:390
231899631,33cyclictest0-21swapper/000:00:240
2318996231,15cyclictest9193-21grep23:15:400
231899621,39cyclictest12928-21grep23:20:400
232099613,4cyclictest0-21swapper/221:55:292
232099612,47cyclictest14348-21uptime19:40:402
232099611,6cyclictest22909-21grep22:50:412
2318996145,5cyclictest101ktimersoftd/020:40:420
2318996130,13cyclictest7950irq/56-dwc_otg_21:30:110
2318996111,30cyclictest0-21swapper/022:45:240
232099606,3cyclictest0-21swapper/223:57:222
232099601,6cyclictest449-21in:imuxsock21:55:112
232099601,5cyclictest1790-21/usr/sbin/munin00:35:272
2319996022,30cyclictest7750irq/56-dwc_otg22:45:261
2318996038,14cyclictest0-21swapper/019:30:100
2318996031,20cyclictest0-21swapper/021:45:250
2318996018,20cyclictest0-21swapper/000:22:520
2318996018,20cyclictest0-21swapper/000:22:520
232199594,29cyclictest0-21swapper/320:45:233
232099599,35cyclictest0-21swapper/223:22:482
232099591,4cyclictest18535-21ssh22:00:422
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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