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2026-07-16 - 19:43

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 Thu Jul 16, 2026 12:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
36132602700,5chrt0-21swapper/212:32:302
35597052700,2sleep1161rcu_preempt11:37:331
32977902660,3sleep3584-21kworker/3:2-events07:15:033
32977902660,3sleep3584-21kworker/3:2-events07:15:033
3292320996054,4cyclictest3423883-21kworker/u8:3+events_unbound09:22:421
3292320996052,6cyclictest3563010-21kworker/u8:0+flush-8:011:50:001
3292320996050,7cyclictest3527736-21latency_hist11:05:001
3292320995751,4cyclictest3537238-21kworker/u8:2+flush-8:012:32:411
3292320995746,8cyclictest3542771-21apt-get11:20:001
3292316995647,7cyclictest281-21systemd-journal12:35:000
3292320995447,4cyclictest3260549-21kworker/u8:1+flush-8:009:47:461
3292320995346,5cyclictest3260549-21kworker/u8:1+flush-8:009:17:271
3292320995345,6cyclictest3251715-21kworker/u8:0+flush-8:007:22:261
3292320995239,9cyclictest281-21systemd-journal11:45:001
3292320995144,5cyclictest3260549-21kworker/u8:1+events_unbound09:07:271
34665712500,2sleep3584-21kworker/3:2+events10:02:333
33095932500,1sleep03309595-21aten2_r5power_e07:27:270
3292320995044,4cyclictest3587677-21kworker/u8:3+flush-8:012:22:311
3292320995043,5cyclictest3502828-21kworker/u8:2+flush-8:010:47:281
3292320995042,6cyclictest3260549-21kworker/u8:1+events_unbound08:02:391
3292320995038,3cyclictest3611499-21kworker/u8:0+flush-8:012:37:361
3292320994943,5cyclictest3537238-21kworker/u8:2+flush-8:011:22:281
3292320994943,4cyclictest3260549-21kworker/u8:1+flush-8:009:12:281
3292316994944,4cyclictest3318890-21kworker/u8:0+flush-8:007:35:010
3292320994843,4cyclictest3338874-21kworker/u8:0+flush-8:008:42:441
3292320994842,4cyclictest1951005-21kworker/u8:2+events_unbound07:55:001
3292320994841,5cyclictest3537238-21kworker/u8:2+flush-8:011:32:381
3292316994839,6cyclictest3323962-21latency_hist07:40:010
329231699480,46cyclictest3582531-21true12:00:000
3292320994741,5cyclictest3349226-21kworker/u8:3+flush-8:008:12:411
3292320994740,5cyclictest3438285-21kworker/u8:2+events_unbound10:07:291
3292320994739,6cyclictest3423883-21kworker/u8:3+events_unbound09:27:401
3292320994739,6cyclictest3328940-21latency_hist07:45:011
3292320994640,4cyclictest3473136-21kworker/u8:0+flush-8:010:52:291
3292320994639,5cyclictest3349226-21kworker/u8:3+flush-8:008:22:341
3292320994638,6cyclictest3493082-21latency_hist10:30:011
3292316994640,4cyclictest3338874-21kworker/u8:0+flush-8:008:47:290
3292316994637,6cyclictest281-21systemd-journal12:30:000
3292320994539,4cyclictest3518105-21kworker/u8:1+flush-8:011:07:371
3292320994539,4cyclictest3473136-21kworker/u8:0+events_unbound10:42:401
3292320994539,4cyclictest3260549-21kworker/u8:1+flush-8:008:52:321
3292320994439,3cyclictest3260549-21kworker/u8:1+events_unbound08:07:271
3292320994438,5cyclictest3308363-21kworker/u8:3+flush-8:007:32:391
3292320994438,4cyclictest3587677-21kworker/u8:3+flush-8:012:12:441
3292320994438,4cyclictest3587677-21kworker/u8:3+flush-8:012:12:441
3292316994438,5cyclictest3260549-21kworker/u8:1+flush-8:009:52:450
3292316994434,7cyclictest3309103-21latency_hist07:25:010
3292320994338,4cyclictest3587677-21kworker/u8:3+events_unbound12:10:001
3292320994338,3cyclictest3438285-21kworker/u8:2+events_unbound10:02:271
3292320994338,3cyclictest3318890-21kworker/u8:0+flush-8:007:37:301
3292320994338,3cyclictest3260549-21kworker/u8:1+events_unbound10:17:431
3292320994337,4cyclictest3260549-21kworker/u8:1+flush-8:009:02:391
3292320994337,4cyclictest3260549-21kworker/u8:1+events_unbound08:00:001
3292320994331,9cyclictest281-21systemd-journal11:12:391
3292316994336,5cyclictest281-21systemd-journal07:42:220
3292316994333,8cyclictest3528407-21diskstats11:07:270
3292320994236,5cyclictest3338874-21kworker/u8:0+flush-8:008:27:391
3292320994236,5cyclictest1951005-21kworker/u8:2+flush-8:007:47:431
3292320994235,5cyclictest3260549-21kworker/u8:1+events_unbound08:17:381
3292320994235,5cyclictest3260549-21kworker/u8:1+events_unbound08:17:381
3292316994235,5cyclictest281-21systemd-journal11:33:190
329231699421,39cyclictest3413511-21munin-run09:10:010
3292320994138,2cyclictest3563010-21kworker/u8:0+events_unbound11:52:401
3292320994136,3cyclictest3438285-21kworker/u8:2+events_unbound10:00:011
3292320994135,4cyclictest3587677-21kworker/u8:3+events_unbound12:17:291
3292320994134,5cyclictest3438285-21kworker/u8:2+events_unbound09:52:381
3292320994133,5cyclictest3338874-21kworker/u8:0+events_unbound08:37:421
3292320994034,4cyclictest3518105-21kworker/u8:1+events_unbound11:30:011
3292320994033,5cyclictest3563010-21kworker/u8:0+events_unbound11:57:301
329232799398,15cyclictest0-21swapper/210:52:242
3292316993929,8cyclictest3588128-21diskstats12:07:290
3292316993928,9cyclictest281-21systemd-journal10:35:000
3292320993833,3cyclictest3260549-21kworker/u8:1+events_unbound08:57:351
3292320993832,5cyclictest3260549-21kworker/u8:1+events_unbound10:32:271
3292320993832,4cyclictest3587677-21kworker/u8:3+events_unbound12:27:291
3292320993832,4cyclictest3260549-21kworker/u8:1+flush-8:008:32:361
3292320993832,4cyclictest1951005-21kworker/u8:2+events_unbound07:12:291
3292320993831,5cyclictest3260549-21kworker/u8:1+flush-8:009:42:321
3292327993621,13cyclictest0-21swapper/208:30:002
3292327993618,16cyclictest3343770-21cron08:00:002
3292320993630,4cyclictest3518105-21kworker/u8:1+events_unbound11:00:011
3292320993630,4cyclictest3260549-21kworker/u8:1+flush-8:008:47:401
3292316993630,4cyclictest3368847-21cut08:25:000
3292316993627,7cyclictest3349398-21/usr/sbin/munin08:07:360
3292320993529,4cyclictest3518105-21kworker/u8:1+flush-8:012:02:271
3292320993525,7cyclictest281-21systemd-journal09:37:551
3292316993531,3cyclictest3438285-21kworker/u8:2+flush-8:010:02:280
3292316993530,4cyclictest3537238-21kworker/u8:2+flush-8:011:37:450
3292316993530,4cyclictest3260549-21kworker/u8:1+events_unbound08:17:420
3292316993530,4cyclictest3260549-21kworker/u8:1+events_unbound08:17:420
3292327993425,6cyclictest281-21systemd-journal12:05:002
3292320993427,5cyclictest1951005-21kworker/u8:2+flush-8:007:17:401
3292320993427,5cyclictest1951005-21kworker/u8:2+flush-8:007:17:401
3292316993430,3cyclictest3260549-21kworker/u8:1+events_unbound08:05:000
3292316993429,4cyclictest3260549-21kworker/u8:1+flush-8:007:57:380
3292316993424,7cyclictest3398634-21latency_hist08:55:010
3292320993327,5cyclictest3260549-21kworker/u8:1+flush-8:010:12:361
3292320993327,5cyclictest3260549-21kworker/u8:1+flush-8:010:12:361
3292316993329,3cyclictest3518105-21kworker/u8:1+flush-8:012:04:000
3292316993327,4cyclictest3458827-21apt-get09:57:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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