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2026-04-18 - 15:12

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 Sat Apr 18, 2026 12:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
338626421560,4sleep3481ktimers/307:55:013
338626421560,4sleep3481ktimers/307:55:013
3339610995449,4cyclictest3287753-21kworker/u8:2+flush-8:007:21:301
34301292530,1chrt3430130-21/usr/sbin/munin08:36:292
3339610995042,6cyclictest3643592-21kworker/u8:3+events_unbound12:21:231
34684042490,4chrt0-21swapper/209:16:222
3339610994940,7cyclictest3574913-21kworker/u8:0+flush-8:011:56:251
3339610994840,6cyclictest3529868-21kworker/u8:3+flush-8:011:16:241
3339610994739,6cyclictest3344498-21latency_hist07:15:011
3339610994738,7cyclictest3350564-21ntpq07:16:241
3339608994740,5cyclictest3499047-21ntpq09:46:220
3339608994638,6cyclictest3579648-21latency_hist11:10:010
3339610994540,4cyclictest3425746-21kworker/u8:0+flush-8:009:16:171
3339610994437,4cyclictest3425746-21kworker/u8:0+events_unbound09:41:231
3339610994436,5cyclictest3287753-21kworker/u8:2+events_unbound07:26:251
3339608994434,8cyclictest3548747-21ntpq10:36:220
3339610994333,8cyclictest3633431-21ntpq12:01:231
3339610994333,8cyclictest3633431-21ntpq12:01:221
3339608994334,6cyclictest3475256-21latency_hist09:25:010
3339613994233,7cyclictest280-21systemd-journal10:53:402
3339610994235,5cyclictest3339488-21kworker/u8:0+flush-8:007:51:261
3339610994235,5cyclictest3339488-21kworker/u8:0+flush-8:007:51:261
3339610994235,4cyclictest3629565-21kworker/u8:2+flush-8:012:11:201
3339610994233,7cyclictest3464474-21ntpq09:11:241
3339610994229,9cyclictest280-21systemd-journal08:14:401
3339608994234,6cyclictest3298041-21kworker/u8:3+flush-8:007:11:120
333477224228,9sleep10-21swapper/107:05:031
3339613994132,7cyclictest280-21systemd-journal07:44:402
3339610994135,5cyclictest3564936-21kworker/u8:1+flush-8:011:36:231
3339610994134,5cyclictest3366086-21kworker/u8:3+flush-8:008:41:261
333960899401,31cyclictest3334581-21kworker/0:2+events09:51:230
333960899401,31cyclictest3334581-21kworker/0:2+events09:51:230
3339610993933,4cyclictest3381143-21kworker/u8:1+flush-8:008:31:241
3339610993932,5cyclictest3366086-21kworker/u8:3+events_unbound10:01:221
3339610993930,6cyclictest3470350-21kworker/u8:2+flush-8:010:11:221
3339608993930,7cyclictest3648231-21ntpq12:16:240
3339613993829,7cyclictest280-21systemd-journal11:20:002
3339610993834,3cyclictest3366086-21kworker/u8:3+flush-8:008:51:161
3339610993832,4cyclictest3425746-21kworker/u8:0+flush-8:009:31:241
3339610993832,4cyclictest280-21systemd-journal12:29:501
3339608993829,7cyclictest3619735-21/usr/sbin/munin11:51:220
333960899381,35cyclictest3619445-21kworker/0:0+events11:58:010
33867982370,3sleep20-21swapper/207:56:162
33867982370,3sleep20-21swapper/207:56:162
3339613993732,3cyclictest3381143-21kworker/u8:1+flush-8:008:11:172
3339610993732,3cyclictest3549602-21kworker/u8:2+events_unbound10:56:171
3339610993731,4cyclictest280-21systemd-journal08:00:401
3339610993731,4cyclictest280-21systemd-journal08:00:391
3339610993730,5cyclictest3381143-21kworker/u8:1+flush-8:008:26:231
3339608993730,5cyclictest3599263-21grep11:26:290
3339608993730,5cyclictest280-21systemd-journal10:21:540
3339608993729,6cyclictest280-21systemd-journal09:00:000
3339608993729,6cyclictest280-21systemd-journal07:20:000
3339608993728,6cyclictest3381143-21kworker/u8:1+flush-8:008:16:120
3339610993630,4cyclictest3549602-21kworker/u8:2+flush-8:010:51:241
3339610993630,4cyclictest3529868-21kworker/u8:3+flush-8:010:21:151
3339610993629,5cyclictest3361637-21apt-get07:31:111
333960899362,28cyclictest3334581-21kworker/0:2+events08:01:110
333960899362,28cyclictest3334581-21kworker/0:2+events08:01:110
3339613993530,4cyclictest3564936-21kworker/u8:1+events_unbound11:21:332
3339613993529,4cyclictest3298041-21kworker/u8:3+flush-8:007:15:052
3339610993530,3cyclictest3339488-21kworker/u8:0+events_unbound08:06:291
3339610993529,4cyclictest3529868-21kworker/u8:3+flush-8:010:26:191
3339610993528,5cyclictest3649320-21kworker/u8:1+events_unbound12:31:251
3339610993527,6cyclictest3574913-21kworker/u8:0+flush-8:011:11:261
3339608993527,6cyclictest280-21systemd-journal10:41:560
333960899352,27cyclictest3334581-21kworker/0:2+events09:45:010
333960899351,32cyclictest3619445-21kworker/0:0+events12:32:170
3339613993425,7cyclictest280-21systemd-journal10:05:012
3339610993429,4cyclictest3425746-21kworker/u8:0+flush-8:008:46:261
3339610993428,4cyclictest3470773-21wget09:21:141
3339610993428,4cyclictest3339488-21kworker/u8:0+flush-8:007:41:291
3339610993428,4cyclictest3339488-21kworker/u8:0+flush-8:007:36:271
3339610993426,6cyclictest3529868-21kworker/u8:3+flush-8:011:51:231
3339610993423,8cyclictest280-21systemd-journal09:36:411
333960899347,23cyclictest3334581-21kworker/0:2+events09:25:170
333960899343,29cyclictest3334581-21kworker/0:2+events08:51:130
3339608993427,5cyclictest3514750-21apt-get10:05:000
3339608993425,7cyclictest3520521-21diskstats10:11:120
333960899342,30cyclictest3334581-21kworker/0:2+events09:56:270
333960899342,26cyclictest3334581-21kworker/0:2+events07:20:470
333960899341,31cyclictest3554602-21kworker/0:2+events10:51:100
3339608993412,20cyclictest3534836-21kworker/0:1+events10:31:150
3339608993410,22cyclictest3334581-21kworker/0:2+events09:10:010
3339608993410,22cyclictest3334581-21kworker/0:2+events08:35:010
3339608993410,22cyclictest3334581-21kworker/0:2+events07:51:130
3339608993410,22cyclictest3334581-21kworker/0:2+events07:51:120
35817262330,2sleep30-21swapper/311:11:203
3339610993328,4cyclictest3564936-21kworker/u8:1+flush-8:012:06:281
3339610993328,3cyclictest3366086-21kworker/u8:3+flush-8:008:21:341
3339610993327,5cyclictest3366086-21kworker/u8:3+events_unbound09:06:251
3339610993326,5cyclictest3287753-21kworker/u8:2+flush-8:007:46:191
3339608993327,4cyclictest3339488-21kworker/u8:0+flush-8:007:41:270
3339608993322,9cyclictest3469451-21ntpq09:16:250
333960899332,29cyclictest3334581-21kworker/0:2+events08:21:270
333960899331,31cyclictest3619445-21kworker/0:0+events12:09:490
3339608993310,22cyclictest3619445-21kworker/0:0+events12:30:000
3339613993227,3cyclictest3604241-21unixbench_singl11:31:312
3339613993226,4cyclictest3505088-21kworker/u8:1+events_unbound10:21:272
3339610993227,3cyclictest3410994-21munin-run08:20:011
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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