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2026-05-25 - 10:04

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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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 25, 2026 00:44:15)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
244493122720,3sleep375-21kworker/3:1-events19:55:533
2395820996356,5cyclictest2417752-21kworker/u8:2+flush-8:021:10:480
2395826995749,6cyclictest2685102-40logrotate00:00:002
2395820995745,9cyclictest2451189-21ntpq20:00:560
24244162550,3chrt75-21kworker/3:1-events19:35:503
2395820995446,6cyclictest2371311-21kworker/u8:4+flush-8:019:45:460
2395820995444,7cyclictest2561339-21/usr/sbin/munin21:56:000
24534132520,2sleep0201rcuc/020:05:490
2395822995246,4cyclictest2371302-21kworker/u8:0+events_unbound00:35:561
2395822995244,6cyclictest2640868-21/usr/sbin/munin23:16:001
2395820995245,4cyclictest2417752-21kworker/u8:2+flush-8:020:40:470
2395822995145,4cyclictest2371311-21kworker/u8:4+flush-8:019:35:471
2395820995143,6cyclictest2566037-21kworker/u8:3+flush-8:022:30:460
2395822995044,4cyclictest2371302-21kworker/u8:0+flush-8:020:51:001
2395822995043,5cyclictest2417752-21kworker/u8:2+flush-8:019:55:491
2395820995044,5cyclictest2417752-21kworker/u8:2+flush-8:020:10:480
2395822994739,6cyclictest2709032-21ntpq00:20:571
2395820994738,7cyclictest2422751-21/usr/sbin/munin19:35:540
2395822994639,5cyclictest2566037-21kworker/u8:3+flush-8:022:55:491
2395822994637,7cyclictest2619954-21ntpq22:50:561
2395822994540,3cyclictest2417752-21kworker/u8:2+flush-8:020:20:481
2395822994540,3cyclictest2417752-21kworker/u8:2+flush-8:020:20:481
2395822994537,5cyclictest2695337-21/usr/sbin/munin00:11:041
2395820994534,9cyclictest2500883-21ntpq20:50:580
2395822994437,5cyclictest2371311-21kworker/u8:4+flush-8:019:26:001
2395822994435,7cyclictest2685140-21kworker/u8:3+events_unbound00:25:551
2395820994437,5cyclictest2371302-21kworker/u8:0+flush-8:023:00:460
2395820994437,5cyclictest2371302-21kworker/u8:0+flush-8:021:05:470
2395820994436,7cyclictest2566037-21kworker/u8:3+flush-8:023:15:560
2395820994334,6cyclictest2470953-21ntpq20:20:560
2395820994334,6cyclictest2470953-21ntpq20:20:560
2395820994332,8cyclictest2442234-21latency_hist19:55:010
2395822994236,4cyclictest2371302-21kworker/u8:0+flush-8:020:55:471
2395820994234,6cyclictest2481712-21gpgv20:35:010
2395820994232,7cyclictest2630976-21/usr/sbin/munin23:05:560
2395820994232,7cyclictest2630976-21/usr/sbin/munin23:05:560
2395820994231,8cyclictest2674362-21ntpq23:45:560
2395822994135,5cyclictest2501722-21kworker/u8:1+flush-8:021:35:471
2395822994135,5cyclictest2371302-21kworker/u8:0+flush-8:023:35:481
2395822994032,6cyclictest2704930-21latency_hist00:20:011
2395822994031,6cyclictest1704890-21systemd-journal19:51:471
2395822993930,7cyclictest2452375-21/usr/sbin/munin20:05:531
2395820993934,3cyclictest2660089-21kworker/u8:2+events_unbound00:15:450
2395820993929,8cyclictest2580853-21apt-get22:15:010
2395822993829,6cyclictest2610945-21latency_hist22:45:011
2395822993828,8cyclictest2689257-21ntpq00:00:561
2395820993834,3cyclictest2417752-21kworker/u8:2+flush-8:021:00:590
2395820993833,4cyclictest2371311-21kworker/u8:4+flush-8:019:20:470
239582099382,30cyclictest2390648-21kworker/0:0+events20:25:040
239520623822,11sleep10-21swapper/119:06:371
2395822993732,3cyclictest2645873-21apt-get23:20:421
2395822993730,5cyclictest2551470-21apt-get21:45:411
2395822993730,5cyclictest2551470-21apt-get21:45:411
2395822993727,7cyclictest2605982-21latency_hist22:40:011
2395820993728,7cyclictest1704890-21systemd-journal20:45:460
239582099372,29cyclictest2390648-21kworker/0:0+events22:00:390
2395820993628,6cyclictest1704890-21systemd-journal21:55:000
2395820993626,7cyclictest2400771-21latency_hist19:15:000
2395820993624,9cyclictest2591523-21diskstats22:25:460
2395822993528,5cyclictest2586018-21latency_hist22:20:001
239582099352,28cyclictest2390648-21kworker/0:0+events19:25:240
2395820993518,15cyclictest1704890-21systemd-journal22:55:000
239582099350,30cyclictest2670305-21kworker/0:2+events23:55:230
25330382340,4sleep10-21swapper/121:25:521
2395822993430,3cyclictest1-21systemd00:00:001
2395822993429,4cyclictest2417752-21kworker/u8:2+flush-8:020:31:011
2395822993427,5cyclictest2482221-21apt-get20:35:431
2395822993424,8cyclictest2510814-21ntpq21:00:561
2395820993429,4cyclictest2371302-21kworker/u8:0+events_unbound22:40:000
239582099342,31cyclictest2586075-21kworker/0:2+events22:58:570
239582099342,30cyclictest2390648-21kworker/0:0+events22:07:170
239582099341,32cyclictest2586075-21kworker/0:2+events23:24:570
2395822993329,3cyclictest2566037-21kworker/u8:3+flush-8:022:30:581
2395822993328,3cyclictest2417752-21kworker/u8:2+flush-8:022:20:471
2395822993327,5cyclictest2566037-21kworker/u8:3+flush-8:023:05:481
2395822993327,5cyclictest2566037-21kworker/u8:3+flush-8:023:05:471
2395820993328,3cyclictest2660089-21kworker/u8:2+flush-8:000:00:580
239582099332,30cyclictest2390648-21kworker/0:0+events22:24:030
239582699328,12cyclictest2396085-21apt-get19:10:452
2395822993227,4cyclictest2417752-21kworker/u8:2+events_unbound22:00:591
2395822993227,3cyclictest2491478-21unixbench_singl20:41:031
2395820993227,3cyclictest2545268-21needreboot21:35:540
239582099320,31cyclictest2650531-21kworker/0:0+events23:42:310
23908522324,9sleep20-21swapper/219:05:172
239582699316,16cyclictest2507010-21http21:00:442
2395822993127,3cyclictest2417752-21kworker/u8:2+flush-8:019:41:011
2395822993127,3cyclictest2371302-21kworker/u8:0+events_unbound23:50:551
2395822993126,4cyclictest2371302-21kworker/u8:0+flush-8:021:32:421
2395822993126,3cyclictest2655468-21systemd-run23:30:011
2395822993126,3cyclictest2466897-21cron20:19:591
2395822993125,5cyclictest2417752-21kworker/u8:2+flush-8:020:01:011
2395822993125,4cyclictest2521797-21apt-get21:15:441
2395822993124,5cyclictest2660089-21kworker/u8:2+flush-8:000:05:481
2395820993126,3cyclictest2705225-21/usr/sbin/munin00:20:500
239582099312,28cyclictest2390648-21kworker/0:0+events19:32:450
2395820993122,6cyclictest1704890-21systemd-journal19:55:470
239582099310,30cyclictest2390648-21kworker/0:0+events20:17:540
239582099310,29cyclictest2390648-21kworker/0:0+events21:22:310
239582699309,8cyclictest0-21swapper/222:50:492
239582699309,11cyclictest2654817-21python323:26:002
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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