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2026-01-01 - 13:01

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 highest latencies:
System rack2slot7s.osadl.org (updated Wed Dec 31, 2025 19:55:38)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3580339996655,6cyclictest3887545-21execl17:49:531
3580338995951,5cyclictest194956-21sh18:09:560
3580338995951,5cyclictest194956-21sh18:09:560
3580338995538,9cyclictest12450irq/32-eth017:39:480
3580340995445,6cyclictest215284-21sh18:10:442
3580339995446,5cyclictest169319-21sh18:08:551
3580339995446,5cyclictest169319-21sh18:08:551
3580339995335,7cyclictest3852156-21sh17:42:071
3580338995335,3cyclictest0-21swapper/017:49:520
3580340995143,5cyclictest3867737-21sh17:42:472
3580338995136,5cyclictest563-21avahi-daemon17:34:470
3580339995042,5cyclictest215941-21sh18:10:451
3580338995043,4cyclictest3888871-21kworker/u8:4-xprtiod18:10:220
3580340994940,6cyclictest181598-21sh18:09:222
3580340994940,6cyclictest181598-21sh18:09:222
3580338994836,6cyclictest151ktimers/017:29:500
3580340994631,11cyclictest4029179-21Run18:03:522
3580340994621,14cyclictest3888997-21sh17:50:062
3580339994638,4cyclictest0-21swapper/118:30:021
3580340994331,9cyclictest275346-21munin-run18:25:002
3580340994315,10cyclictest276399-21ntpq18:30:002
3580339994338,2cyclictest0-21swapper/117:39:521
3580338994226,13cyclictest3823388-21sh17:40:560
3580340994132,6cyclictest3587978-21grep17:29:582
3580339994128,5cyclictest1165-21mta-sts-daemon18:04:491
3580340994032,5cyclictest3887546-21execl17:49:572
3580340994032,5cyclictest1165-21mta-sts-daemon18:39:492
3580339994028,9cyclictest564-21dbus-daemon17:30:011
3580340993931,5cyclictest3770262-21unixbench_singl17:35:012
3580339993931,3cyclictest0-21swapper/117:35:011
3580339993832,3cyclictest0-21swapper/118:25:011
3580338993828,7cyclictest0-21swapper/018:30:020
3580340993731,3cyclictest0-21swapper/217:39:512
3580340993730,4cyclictest3583246-21grep17:15:012
3580340993724,8cyclictest3584401-21ntpq17:19:542
3580339993728,6cyclictest3580337-21cyclictest17:54:511
3580340993628,5cyclictest582-21systemd-logind17:25:012
3580340993624,7cyclictest577-21mta-sts-daemon17:56:352
3580340993612,7cyclictest273416-21ntpq18:19:482
3580339993628,5cyclictest3891206-21kernelversion17:59:451
3580338993623,10cyclictest0-21swapper/018:03:010
3580338993621,12cyclictest0-21swapper/017:50:300
3580338993613,15cyclictest151ktimers/017:09:470
3580339993528,4cyclictest3584777-21munin-run17:20:011
3580340993424,7cyclictest278379-21users18:35:002
358033999342,24cyclictest3585272-21fstime17:24:501
3580340993222,7cyclictest3580562-21sshd17:06:572
3580338993225,4cyclictest3583246-21grep17:15:010
3580338993126,3cyclictest3586395-21unixbench_multi17:24:570
3580339993023,4cyclictest279861-21munin-run18:40:011
3580339993022,5cyclictest276804-21systemctl18:30:061
3580339993022,5cyclictest0-21swapper/118:20:001
3580338993023,5cyclictest275317-21cron18:25:000
3580338992921,5cyclictest0-21swapper/017:59:430
3580339992822,3cyclictest0-21swapper/117:15:011
3580338992722,3cyclictest278292-21unixbench_multi18:34:590
3580338992721,4cyclictest3584829-21cat17:20:010
3580340992513,9cyclictest369-21systemd-journal17:05:012
3580339992518,4cyclictest0-21swapper/117:10:021
3580338992419,2cyclictest0-21swapper/017:05:010
3580338992315,6cyclictest563-21avahi-daemon18:35:410
3580338992217,3cyclictest273554-21wc18:19:530
358033999214,4cyclictest171rcu_preempt17:05:021
358034199183,7cyclictest0-21swapper/317:44:483
358034199182,9cyclictest0-21swapper/318:09:513
358034199182,9cyclictest0-21swapper/318:09:513
358034199174,7cyclictest0-21swapper/318:01:143
358034199174,7cyclictest0-21swapper/317:49:513
358034199174,7cyclictest0-21swapper/317:39:513
358034199173,8cyclictest0-21swapper/318:30:023
358034199173,6cyclictest0-21swapper/317:27:573
358034199162,9cyclictest0-21swapper/317:56:133
358034199162,7cyclictest0-21swapper/317:34:513
358034199153,7cyclictest0-21swapper/318:11:413
358034199153,7cyclictest0-21swapper/317:51:093
358034199152,6cyclictest0-21swapper/318:19:503
358034199143,4cyclictest0-21swapper/317:24:503
358034199141,5cyclictest0-21swapper/318:39:463
358034199131,7cyclictest0-21swapper/317:19:513
358034199111,6cyclictest0-21swapper/317:15:013
358034199111,5cyclictest0-21swapper/317:09:423
358034199102,7cyclictest0-21swapper/317:05:013
358034199101,7cyclictest0-21swapper/318:34:543
358034199101,4cyclictest0-21swapper/318:25:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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