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2026-04-30 - 12:24

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 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 100 highest latencies:
System rack2slot7s.osadl.org (updated Thu Apr 30, 2026 00:43:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3687770996934,19cyclictest1-21systemd19:45:011
3687770996934,19cyclictest1-21systemd19:45:011
3687770996050,5cyclictest0-21swapper/121:25:491
3687769995223,21cyclictest0-21swapper/021:25:560
3687771995144,4cyclictest1056-21mta-sts-daemon19:45:492
3687770994916,19cyclictest0-21swapper/121:33:391
3687771994736,8cyclictest3702741-21sendmail20:00:012
368776999475,11cyclictest3813617-21ssh23:20:480
3687770994636,6cyclictest3723830-21latency_hist21:10:021
3687770994625,18cyclictest0-21swapper/100:15:011
3687770994625,18cyclictest0-21swapper/100:15:011
3687769994636,6cyclictest151ktimers/020:50:460
3687769994621,3cyclictest0-21swapper/000:05:010
3687771994538,4cyclictest1056-21mta-sts-daemon22:41:472
3687771994538,4cyclictest1056-21mta-sts-daemon22:41:472
3687771994535,7cyclictest261-21systemd-journal22:50:272
3687770994537,5cyclictest3809590-21systemd-run23:15:011
3687769994537,5cyclictest3845589-21systemd-run00:10:010
3687769994528,15cyclictest3713236-21cron20:35:000
3687769994528,15cyclictest3713236-21cron20:35:000
3687771994434,6cyclictest3834034-21unixbench_singl23:50:562
3687771994424,9cyclictest1017-21sendmail-mta20:05:452
368777099444,34cyclictest3813628-21ssh23:20:491
3687769994428,14cyclictest3792554-21munin-plugin-st22:50:000
3687769994428,14cyclictest3792554-21munin-plugin-st22:50:000
3687771994336,4cyclictest0-21swapper/223:15:012
3687770994334,6cyclictest3773186-21latency_hist22:20:021
368777099433,32cyclictest3702230-21ntpq19:55:541
3687770994324,15cyclictest3710257-21latency_hist20:25:011
368777099431,4cyclictest3699182-21ntpq19:45:451
3687769994336,4cyclictest3856188-21sh00:25:000
3687769994336,4cyclictest151ktimers/021:05:440
368777199425,28cyclictest3733107-21ssh21:20:492
3687771994232,6cyclictest3745285-21sed21:35:572
3687771994232,6cyclictest3745285-21sed21:35:572
368777099429,30cyclictest3791712-21ssh22:48:181
368777099429,30cyclictest3791712-21ssh22:48:181
368777099423,33cyclictest3752223-21ntpq21:45:501
368777099423,33cyclictest3752223-21ntpq21:45:501
3687770994220,19cyclictest421-21dbus-daemon21:15:011
3687770994217,22cyclictest3704262-21idleruntime-cro20:05:011
368777099421,10cyclictest3838393-21ssh23:59:081
368777099421,10cyclictest3830352-21ssh23:46:251
3687769994221,3cyclictest0-21swapper/020:45:010
3687769994221,2cyclictest0-21swapper/023:40:010
3687769994219,3cyclictest3748502-21ssh21:40:490
3687769994216,8cyclictest12350irq/32-eth021:10:450
3687771994134,4cyclictest695-21cron23:25:012
3687770994134,4cyclictest3713261-21kworker/u8:0+xprtiod20:35:011
3687770994134,4cyclictest3713261-21kworker/u8:0+xprtiod20:35:011
3687770994133,5cyclictest0-21swapper/121:25:011
368777099412,4cyclictest3691736-21ntpq19:20:461
368777099412,34cyclictest3826855-21ntpq23:40:511
368777099412,34cyclictest3694723-21ntpq19:30:521
368777099412,34cyclictest3694723-21ntpq19:30:521
368777099412,33cyclictest3706665-21ntpq20:10:471
368777099411,10cyclictest3760330-21ssh21:59:471
3687769994134,5cyclictest1-21systemd22:10:020
3687769994129,10cyclictest3711768-21systemd-run20:30:010
3687771994033,4cyclictest1055-21mta-sts-daemon22:27:032
3687771994031,6cyclictest1895805-21cups-browsed23:41:092
368777099409,29cyclictest3731646-21ssh21:19:531
368777099409,27cyclictest3747647-21cat21:40:331
368777099403,31cyclictest3761611-21ntpq22:00:441
3687770994031,6cyclictest3770477-21ssh22:15:011
368777099402,5cyclictest3705125-21ntpq20:05:441
368777099402,34cyclictest3780763-21ntpq22:30:471
368777099402,34cyclictest3717129-21ntpq20:45:441
368777099402,34cyclictest3690116-21ntpq19:15:431
368777099402,31cyclictest3820189-21ssh23:30:481
368777099402,29cyclictest428-21mta-sts-daemon19:25:491
3687770994018,20cyclictest0-21swapper/123:00:011
3687770994018,18cyclictest0-21swapper/122:40:431
3687770994018,18cyclictest0-21swapper/122:40:431
368777099401,7cyclictest3757514-21sshd21:53:271
368777099401,7cyclictest3757514-21sshd21:53:271
368777099401,5cyclictest3715726-21ntpq20:40:501
368777099401,4cyclictest3700718-21ntpq19:50:501
368777099401,33cyclictest3816717-21sh23:25:351
368777099401,33cyclictest3718769-21ps20:50:501
368777099401,13cyclictest3744608-21ntpq21:35:441
368777099401,13cyclictest3744608-21ntpq21:35:441
368777099401,11cyclictest3714778-21systemd-run20:40:011
368777199393,26cyclictest3846895-21ssh00:10:472
368777199393,26cyclictest3846895-21ssh00:10:472
3687771993931,5cyclictest3761238-21fschecks_count22:00:382
3687771993931,5cyclictest3754592-21latency_hist21:50:012
3687771993931,5cyclictest3754592-21latency_hist21:50:012
3687771993931,4cyclictest1054-21mta-sts-daemon22:22:182
3687771993928,5cyclictest0-21swapper/223:30:462
368777099398,28cyclictest3777432-21ssh22:25:421
3687770993931,5cyclictest3776889-21munin-plugin-st22:25:011
3687770993930,6cyclictest3840038-21needreboot00:00:431
368777099392,4cyclictest3711136-21ntpq20:25:441
368777099392,33cyclictest3721637-21ntpq21:00:451
368777099392,33cyclictest3696177-21ntpq19:35:471
368777099392,33cyclictest3696177-21ntpq19:35:471
368777099391,9cyclictest3843140-21ssh00:05:101
368777099391,8cyclictest3800497-21ntpq23:00:561
368777099391,5cyclictest3708232-21ntpq20:15:471
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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