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2026-04-26 - 01:46

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 Sun Apr 26, 2026 00:43:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
427328988,0sleep20-21swapper/218:54:332
432324029,0sleep00-21swapper/018:55:070
304450350,0irq/25-eth10-21swapper/318:53:393
421123122,0sleep10-21swapper/118:53:481
45899976,0cyclictest0-21swapper/021:06:520
35160,0ktimersoftd/30-21swapper/321:37:423
35160,0ktimersoftd/30-21swapper/321:37:423
339960,0migration/39927-21sh22:21:423
339960,0migration/37462-21sh23:58:053
339960,0migration/332348-21sh23:54:533
339960,0migration/325206-21runrttasks21:27:463
339960,0migration/324867-21sh23:10:013
339960,0migration/324491-21latency21:07:423
339960,0migration/317518-21sh22:25:253
339960,0migration/317017-21sh23:05:223
339960,0migration/314347-21munin-node19:52:413
29725060,0irq/27-eth0-tx-0-21swapper/020:14:420
29715060,0irq/26-eth0-rx-730-21python21:32:473
29715060,0irq/26-eth0-rx-2865-21munin-node20:57:363
29715060,0irq/26-eth0-rx-10087-21df_inode23:22:363
8215050,0irq/24-0000:00:19397-21df19:32:372
8215050,0irq/24-0000:00:1088-21munin-run23:37:232
45919955,0cyclictest0-21swapper/223:52:362
45919955,0cyclictest0-21swapper/222:14:142
45919955,0cyclictest0-21swapper/221:44:542
45919955,0cyclictest0-21swapper/221:18:162
45919955,0cyclictest0-21swapper/221:07:422
45919955,0cyclictest0-21swapper/200:07:262
45919950,0cyclictest0-21swapper/222:54:542
45919950,0cyclictest0-21swapper/220:02:352
45909950,0cyclictest0-21swapper/121:57:351
45909950,0cyclictest0-21swapper/121:43:231
45909950,0cyclictest0-21swapper/100:24:121
45899955,0cyclictest645-21kworker/0:022:37:550
45899955,0cyclictest2331-21kworker/0:220:27:360
45899955,0cyclictest0-21swapper/021:33:300
45899955,0cyclictest0-21swapper/000:11:480
45899954,0cyclictest26748-21tr19:37:410
45899954,0cyclictest10984-21kworker/0:123:38:590
45899950,0cyclictest0-21swapper/022:42:240
45899950,0cyclictest0-21swapper/021:19:470
45899950,0cyclictest0-21swapper/000:20:000
35150,0ktimersoftd/30-21swapper/320:34:383
35150,0ktimersoftd/30-21swapper/300:05:203
339950,0migration/36783-21kthreadcore22:37:413
339950,0migration/36185-21kthreadcore00:17:423
339950,0migration/329014-21kthreadcore22:52:423
339950,0migration/326743-21munin-node23:32:403
339950,0migration/326123-21munin-node19:37:383
339950,0migration/322833-21munin-node00:07:453
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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