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2026-05-18 - 09:45

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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  Intel
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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: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Mon May 18, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
376676421910,3sleep375-21kworker/3:1+mm_percpu_wq20:50:533
3664831996150,8cyclictest3731077-21apt-get20:15:000
3664834995651,3cyclictest3690503-21kworker/u8:1+flush-8:020:51:081
37187142520,3chrt3718712-21ps20:00:570
3664831995247,3cyclictest3690503-21kworker/u8:1+events_unbound22:55:530
3664831995241,8cyclictest3785069-21ntpq21:06:030
3664834995146,4cyclictest3890423-21kworker/u8:0+flush-8:023:30:521
3664834995044,4cyclictest3756583-21kworker/u8:0+flush-8:022:00:531
39551392490,3sleep375-21kworker/3:1+events00:00:503
37040312490,2sleep1281rcuc/119:45:571
3664834994944,4cyclictest3839989-21kworker/u8:3+flush-8:022:21:071
3664834994944,4cyclictest3690503-21kworker/u8:1+flush-8:019:35:521
3664831994941,6cyclictest3988509-21ntpq00:31:000
3664834994843,4cyclictest3701594-21kworker/u8:3+flush-8:020:16:051
3664834994843,4cyclictest3664697-21kworker/u8:0+flush-8:019:21:091
3664834994736,8cyclictest280-21systemd-journal22:31:341
3664831994736,9cyclictest3675657-21ntpq19:16:000
3664834994641,4cyclictest3839989-21kworker/u8:3+flush-8:022:15:531
3664834994640,4cyclictest3622989-21kworker/u8:2+flush-8:019:11:031
3664834994638,6cyclictest280-21systemd-journal21:31:351
38669432450,5sleep3481ktimers/322:30:573
3664837994537,6cyclictest3810942-21apt-get21:35:482
3664834994541,3cyclictest3776316-21kworker/u8:2+flush-8:023:01:041
3664834994540,4cyclictest3690503-21kworker/u8:1+flush-8:020:35:521
3664834994540,4cyclictest3690503-21kworker/u8:1+events_unbound22:36:041
3664834994536,6cyclictest3664659-21latency_hist19:10:011
3664834994440,3cyclictest3776316-21kworker/u8:2+events_unbound23:05:531
3664834994440,3cyclictest3776316-21kworker/u8:2+events_unbound23:05:531
3664834994439,3cyclictest3954944-21kworker/u8:4+events_unbound00:11:041
3664834994438,4cyclictest3954944-21kworker/u8:4+events_unbound00:00:531
3664834994436,6cyclictest3690503-21kworker/u8:1+flush-8:022:56:021
3664834994430,11cyclictest280-21systemd-journal21:11:351
3664831994437,5cyclictest3690503-21kworker/u8:1+flush-8:023:15:540
3664834994338,3cyclictest3794912-21ntpq21:16:021
3664834994337,4cyclictest3741558-21apt-get20:25:501
3664834994336,5cyclictest3756583-21kworker/u8:0+flush-8:021:21:071
3664834994237,3cyclictest3690503-21kworker/u8:1+events_unbound23:15:591
3664834994236,3cyclictest3924730-21kworker/u8:3+flush-8:023:35:491
3664834994236,3cyclictest3756583-21kworker/u8:0+flush-8:021:50:571
3664834994235,5cyclictest3924730-21kworker/u8:3+flush-8:023:56:041
3664831994234,6cyclictest280-21systemd-journal19:55:350
3664837994135,4cyclictest3870172-21apt-get22:34:592
3664837994123,16cyclictest3725735-21unixbench_multi20:06:072
3664837994119,7cyclictest280-21systemd-journal22:40:352
3664834994135,5cyclictest3701594-21kworker/u8:3+flush-8:019:51:031
3664834994135,4cyclictest3890423-21kworker/u8:0+flush-8:000:16:061
3664834994135,4cyclictest3622989-21kworker/u8:2+flush-8:019:31:051
3664831994131,8cyclictest3806238-21diskstats21:30:510
3664837994025,13cyclictest3905617-21aten2_r5power_p23:10:512
3664834994034,4cyclictest3776316-21kworker/u8:2+events_unbound21:06:021
3664834994034,4cyclictest3690503-21kworker/u8:1+flush-8:020:40:541
3664837993933,4cyclictest3756583-21kworker/u8:0+flush-8:021:45:532
3664834993935,3cyclictest3776316-21kworker/u8:2+flush-8:021:41:051
3664834993932,5cyclictest3690503-21kworker/u8:1+flush-8:023:41:061
3664831993929,7cyclictest3800748-21latency_hist21:25:010
3664834993833,3cyclictest3711578-21apt-get19:55:491
3664834993831,4cyclictest3701594-21kworker/u8:3+flush-8:020:56:081
3664831993830,6cyclictest3854438-21ntpq22:16:020
3664834993732,4cyclictest3690503-21kworker/u8:1+flush-8:022:51:061
3664834993731,4cyclictest3954733-21kworker/u8:2+events_unbound00:30:531
3664834993730,4cyclictest3989685-21apt-get00:35:491
3664834993730,4cyclictest3690503-21kworker/u8:1+events_unbound21:26:031
3664831993727,8cyclictest3958829-21ntpq00:01:000
3664831993726,8cyclictest3885228-21latency_hist22:50:010
3664837993620,2cyclictest3886063-21fschecks_count22:50:532
3664834993630,4cyclictest3756583-21kworker/u8:0+flush-8:021:36:061
3664831993631,4cyclictest3690503-21kworker/u8:1+flush-8:022:30:530
3664831993630,4cyclictest3701662-21apt-get19:45:480
3664831993629,5cyclictest3687016-21diskstats19:30:520
3664831993628,5cyclictest3681499-21latency_hist19:25:010
37018212350,2sleep20-21swapper/219:45:512
3664837993521,2cyclictest3910689-21cpuspeed_turbos23:15:512
3664834993529,4cyclictest3884825-21grep22:46:071
3664834993526,7cyclictest3864416-21ntpq22:26:041
3664834993526,6cyclictest3690503-21kworker/u8:1+flush-8:019:41:031
3664831993530,4cyclictest3839989-21kworker/u8:3+flush-8:022:06:060
3664837993424,7cyclictest280-21systemd-journal19:45:012
3664837993418,2cyclictest3890736-21aten2_r5power_c22:55:502
3664834993428,4cyclictest3756583-21kworker/u8:0+flush-8:021:46:011
3664834993428,4cyclictest3701594-21kworker/u8:3+events_unbound20:05:501
3664831993430,3cyclictest3756583-21kworker/u8:0+events_unbound20:41:070
36600452334,9sleep20-21swapper/219:05:342
3664837993223,7cyclictest3751121-21apt-get20:35:002
3664834993228,3cyclictest3756583-21kworker/u8:0+flush-8:020:45:531
3664834993226,5cyclictest3664697-21kworker/u8:0+flush-8:019:16:021
3664834993222,7cyclictest3850177-21latency_hist22:15:001
3664831993227,4cyclictest3839989-21kworker/u8:3+flush-8:022:11:040
3664831993227,4cyclictest3776316-21kworker/u8:2+flush-8:023:26:050
3664831993227,4cyclictest3776316-21kworker/u8:2+flush-8:021:35:530
3664831993224,6cyclictest3690503-21kworker/u8:1+flush-8:021:11:050
3664837993114,3cyclictest0-21swapper/219:24:592
3664834993125,4cyclictest3690503-21kworker/u8:1+flush-8:020:01:081
3664834993125,4cyclictest3690503-21kworker/u8:1+events_unbound22:41:031
3664831993126,4cyclictest3607413-21kworker/u8:3+flush-8:019:10:530
3664831993121,7cyclictest3726142-21latency_hist20:10:010
3664834993025,3cyclictest3944817-21latency_hist23:49:591
3664834993025,3cyclictest3920044-21cron23:25:011
3664834993024,4cyclictest3839989-21kworker/u8:3+events_unbound22:05:481
3664831993025,4cyclictest3701594-21kworker/u8:3+flush-8:020:31:050
3664831993025,4cyclictest3690503-21kworker/u8:1+flush-8:023:20:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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