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2026-04-27 - 02:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, slot #2

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 here to display the system's profile data or here to proceed to next system.
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 rack1slot2s.osadl.org (updated Mon Apr 27, 2026 00:43:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
417924434,0sleep10-21swapper/118:54:501
432723723,0sleep00-21swapper/018:56:370
414423726,0sleep30-21swapper/318:54:283
406723626,0sleep20-21swapper/218:53:352
44639965,0cyclictest2719-21cut23:37:342
44619960,0cyclictest0-21swapper/123:08:211
44619960,0cyclictest0-21swapper/122:18:421
44609960,0cyclictest0-21swapper/023:43:260
44609960,0cyclictest0-21swapper/022:59:360
35160,0ktimersoftd/30-21swapper/323:04:503
339960,0migration/39376-21sh23:21:413
339960,0migration/33754-21munin-node21:57:333
339960,0migration/326209-21sh21:09:483
339960,0migration/316205-21switchtime22:42:413
339960,0migration/31176-21sh21:12:453
29715060,0irq/26-eth0-rx-25188-21sh22:28:493
149960,0migration/018147-21sh22:26:360
149960,0migration/011521-21aten2.4-expect21:22:290
44639955,0cyclictest0-21swapper/223:27:052
44639955,0cyclictest0-21swapper/200:24:002
44639950,0cyclictest0-21swapper/222:50:592
44639950,0cyclictest0-21swapper/221:17:112
44639950,0cyclictest0-21swapper/220:58:352
44619955,0cyclictest0-21swapper/121:09:571
44619955,0cyclictest0-21swapper/120:32:351
44619955,0cyclictest0-21swapper/119:52:421
44619950,0cyclictest0-21swapper/123:31:031
44619950,0cyclictest0-21swapper/123:24:071
44609955,0cyclictest0-21swapper/021:40:460
44609950,0cyclictest0-21swapper/021:56:320
44609950,0cyclictest0-21swapper/021:29:060
44609950,0cyclictest0-21swapper/000:20:570
4150,0ktimersoftd/00-21swapper/023:18:140
339950,0migration/3885-21taskset22:54:543
339950,0migration/37026-21sh23:57:383
339950,0migration/35507-21latency_hist19:22:193
339950,0migration/34342-21kthreadcore20:32:353
339950,0migration/33481-21kthreadcore23:37:353
339950,0migration/331759-21kthreadcore20:52:363
339950,0migration/329341-21kthreadcore21:32:353
339950,0migration/326810-21aten_r1power_vo22:32:303
339950,0migration/324971-21cpuspeed_turbos19:12:323
339950,0migration/324449-21kthreadcore21:27:363
339950,0migration/323940-21kthreadcore19:57:373
339950,0migration/322985-21irqcore20:47:353
339950,0migration/319594-21irqrtprio22:47:343
339950,0migration/319370-21taskset19:53:123
339950,0migration/316958-21munin-node21:22:383
339950,0migration/315380-21munin-node20:42:313
339950,0migration/313490-21kthreadcore21:42:363
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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