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2026-01-08 - 12:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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 376 highest latencies:
System rack2slot7s.osadl.org (updated Wed Jan 07, 2026 19:55:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3464034998040,32cyclictest735-21lldpd17:44:520
3464036997364,6cyclictest77348-21sort18:09:592
3464036997364,6cyclictest77348-21sort18:09:592
3464034997245,24cyclictest143081-21sh18:12:350
3464034997245,24cyclictest143081-21sh18:12:350
3464034996645,18cyclictest29376-21wc18:08:030
3464034996645,18cyclictest29376-21wc18:08:030
3464035996147,8cyclictest76945-21tee18:09:581
3464035996147,8cyclictest76945-21tee18:09:581
3464035995837,17cyclictest131067-21sh18:12:081
3464035995837,17cyclictest131067-21sh18:12:081
3464035995833,22cyclictest3718745-21sh17:41:181
3464036995749,5cyclictest3773372-21execl17:50:022
3464035995445,6cyclictest3773373-21execl17:49:551
3464036995341,4cyclictest0-21swapper/217:39:592
3464034995240,9cyclictest0-21swapper/017:50:000
3464036995144,4cyclictest91504-21sort18:10:332
3464036995144,4cyclictest91504-21sort18:10:332
3464036995042,5cyclictest3720606-21sh17:41:232
3464035994931,11cyclictest3599127-21spawn17:34:541
346403599482,15cyclictest154942-21ntpq18:19:561
3464036994537,5cyclictest158318-21sed18:30:002
3464035994534,6cyclictest3774952-21fstime17:54:561
3464034994535,5cyclictest151ktimers/018:24:540
3464034994535,4cyclictest3469925-21threads17:25:000
3464035994423,18cyclictest3850339-21spawn18:03:051
3464035994422,20cyclictest0-21swapper/118:35:011
3464036994333,7cyclictest3471359-21idleruntime-cro17:30:012
3464035994320,20cyclictest3685431-21sh17:39:351
346403599431,10cyclictest160074-21sshd18:35:131
3464036994234,5cyclictest3778108-21sh18:00:252
346403599422,6cyclictest3466369-21ntpq17:14:531
346403599421,12cyclictest3471144-21ntpq17:29:541
346403599421,10cyclictest3777339-21open_files17:59:571
3464034994235,4cyclictest3466675-21switchtime17:15:010
3464034994224,14cyclictest12450irq/32-eth017:39:550
346403599411,9cyclictest3464320-21aten_r2power_en17:09:391
3464034994135,4cyclictest1165-21mta-sts-daemon18:19:570
3464036994033,3cyclictest0-21swapper/217:19:542
3464036994033,3cyclictest0-21swapper/217:19:542
3464036994031,6cyclictest564-21dbus-daemon17:15:012
346403599401,10cyclictest156233-21memory18:24:501
3464036993929,6cyclictest156869-21latency_hist18:25:022
346403699392,33cyclictest3647787-21spawn17:34:562
346403599391,6cyclictest157840-21ntpq18:29:521
346403599391,12cyclictest3468048-21ntpq17:19:521
346403599391,12cyclictest3468048-21ntpq17:19:521
3464034993932,3cyclictest0-21swapper/018:02:070
3464036993832,3cyclictest0-21swapper/218:36:072
346403699374,25cyclictest3776542-21Run17:59:172
3464036993727,5cyclictest0-21swapper/217:50:102
3464034993731,4cyclictest3468590-21unixbench-2d17:20:020
3464034993731,4cyclictest3468590-21unixbench-2d17:20:020
346403499372,28cyclictest3599127-21spawn17:34:550
346403599360,10cyclictest3468925-21sshd17:22:131
3464034993626,8cyclictest3773373-21execl17:50:040
3464034993514,14cyclictest3776471-21fstime17:58:240
346403699343,9cyclictest171rcu_preempt18:19:572
3464034993327,3cyclictest0-21swapper/017:30:010
346403699321,27cyclictest3468962-21fstime17:24:512
3464035993223,7cyclictest3464043-21sh17:05:011
3464034993122,7cyclictest160941-21latency_hist18:40:020
3464036993023,4cyclictest159597-21munin-run18:35:002
3464034993021,7cyclictest157857-21ntp_kernel_pll_18:29:530
3464034992912,13cyclictest763-21snmpd17:09:510
3464036992817,8cyclictest3465492-21sh17:10:012
3464034992820,6cyclictest155724-21kworker/u8:0-xprtiod18:35:000
3464036992519,3cyclictest0-21swapper/217:05:022
3464034991911,6cyclictest582-21systemd-logind17:05:020
346403799184,8cyclictest0-21swapper/318:09:543
346403799184,8cyclictest0-21swapper/318:09:543
346403799181,6cyclictest0-21swapper/318:19:573
346403799181,10cyclictest0-21swapper/317:50:013
346403799163,8cyclictest0-21swapper/317:56:143
346403799162,8cyclictest0-21swapper/317:39:543
346403799161,7cyclictest0-21swapper/317:14:543
346403799152,8cyclictest0-21swapper/318:10:243
346403799152,8cyclictest0-21swapper/318:10:243
346403799152,7cyclictest0-21swapper/317:34:543
346403799152,7cyclictest0-21swapper/317:24:533
346403799151,9cyclictest0-21swapper/318:03:083
346403799143,6cyclictest0-21swapper/317:41:023
346403799142,6cyclictest0-21swapper/317:19:553
346403799142,6cyclictest0-21swapper/317:19:553
346403799131,6cyclictest0-21swapper/318:24:563
346403799130,6cyclictest0-21swapper/318:29:513
346403799121,7cyclictest0-21swapper/317:50:043
346403799121,5cyclictest0-21swapper/318:34:483
346403799112,5cyclictest0-21swapper/318:36:073
346403799112,5cyclictest0-21swapper/317:09:413
346403799101,6cyclictest0-21swapper/317:26:453
34640379991,6cyclictest0-21swapper/317:05:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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