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2026-08-23 - 13:17

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 Sun Aug 23, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
372531222630,5sleep3451irq_work/300:37:453
352221321870,4sleep30-21swapper/321:12:463
35671122800,2sleep3471rcuc/321:57:453
34101212750,7sleep3575-21kworker/3:2+mm_percpu_wq19:22:433
34345682540,3chrt0-21swapper/019:47:360
3397019995343,7cyclictest3697717-21turbostat.cron00:10:002
3397013995242,7cyclictest3697715-21latency_hist00:10:010
3397015994941,6cyclictest3672532-21latency_hist23:45:011
3397019994842,4cyclictest3677442-21apt-get23:50:002
3397013994843,3cyclictest3677932-21kworker/u8:1+flush-8:000:22:400
3397013994840,6cyclictest3703078-21/usr/sbin/munin00:17:540
3397013994839,6cyclictest3478761-21latency_hist20:30:010
3397013994838,6cyclictest275-21systemd-journal22:05:180
3397013994742,4cyclictest3365605-21kworker/u8:2+events_unbound19:15:030
3397013994741,4cyclictest3498390-21kworker/u8:2+flush-8:020:52:410
3397019994639,5cyclictest3365605-21kworker/u8:2+flush-8:020:22:522
36086292450,5sleep10-21swapper/122:42:371
3397015994541,3cyclictest3439258-21kworker/u8:1+events_unbound21:17:451
3397015994539,4cyclictest3439258-21kworker/u8:1+flush-8:023:17:411
3397015994538,5cyclictest3558832-21apt-get21:52:341
3397013994540,3cyclictest3439258-21kworker/u8:1+flush-8:020:17:520
3397015994439,4cyclictest3513668-21kworker/u8:3+flush-8:021:07:411
3397013994436,6cyclictest3483918-21kworker/u8:0+flush-8:020:37:390
3397015994334,6cyclictest3627796-21latency_hist23:00:011
3397015994334,6cyclictest3568542-21latency_hist22:00:011
3397013994337,5cyclictest3677932-21kworker/u8:1+events_unbound00:30:000
3397019994233,6cyclictest275-21systemd-journal20:00:002
33923332424,10sleep10-21swapper/119:07:081
3397015994136,4cyclictest3688056-21kworker/u8:0+flush-8:000:32:391
3397013994134,5cyclictest3688056-21kworker/u8:0+events_unbound00:40:000
3397013994134,5cyclictest3365605-21kworker/u8:2+flush-8:020:07:530
3397013994133,7cyclictest3401707-21kworker/u8:3+flush-8:020:42:550
3397019994031,7cyclictest3429123-21cat19:40:012
3397015994034,4cyclictest275-21systemd-journal21:44:181
3397015994033,5cyclictest3365605-21kworker/u8:2+flush-8:019:22:481
3397015994031,7cyclictest3512676-21ntpq21:02:491
3397015994031,6cyclictest3483673-21latency_hist20:35:011
3397015994030,7cyclictest3687982-21base6400:00:011
3397013994032,6cyclictest3401707-21kworker/u8:3+flush-8:020:47:540
3397013994032,6cyclictest3401707-21kworker/u8:3+flush-8:020:47:540
3397013994031,6cyclictest275-21systemd-journal23:05:180
3397015993933,4cyclictest3693232-21apt-get00:07:361
3397013993828,8cyclictest3651743-21ntpq23:22:460
339701399380,36cyclictest1-21systemd19:51:180
3397015993727,8cyclictest3587573-21ntpq22:17:481
3397013993733,3cyclictest3413599-21kworker/u8:0+flush-8:019:42:380
3397013993731,4cyclictest275-21systemd-journal22:55:000
3397013993728,7cyclictest275-21systemd-journal23:45:000
3397015993629,5cyclictest3534143-21apt-get21:27:361
3397013993629,5cyclictest3365605-21kworker/u8:2+flush-8:019:27:460
3397013993626,7cyclictest3508455-21latency_hist21:00:010
3397013993531,3cyclictest3423691-21cron19:35:000
3397019993429,4cyclictest3677932-21kworker/u8:1+flush-8:000:37:522
3397015993427,5cyclictest3662399-21cron23:35:001
3397015993426,6cyclictest3677443-21latency_hist23:50:011
3397015993426,6cyclictest3423695-21latency_hist19:35:011
3397015993425,7cyclictest3593249-21latency_hist22:25:011
3397015993425,7cyclictest3498980-21/usr/sbin/munin20:52:491
3397015993425,7cyclictest3365605-21kworker/u8:2+flush-8:020:22:481
3397013993426,6cyclictest275-21systemd-journal22:29:490
3397013993426,5cyclictest3538636-21latency_hist21:30:000
3397015993327,4cyclictest3439258-21kworker/u8:1+flush-8:020:57:521
3397015993327,4cyclictest3401707-21kworker/u8:3+flush-8:020:07:401
3397015993326,5cyclictest275-21systemd-journal22:13:181
3397013993327,4cyclictest3481342-21tail20:32:440
3397013993327,4cyclictest3401645-21grep19:12:550
3397013993321,10cyclictest3428659-21latency_hist19:40:010
3397019993227,3cyclictest3459321-21aten2_r5power_v20:12:382
3397015993222,8cyclictest3638111-21/usr/sbin/munin23:12:481
3397013993225,5cyclictest3439258-21kworker/u8:1+flush-8:021:32:520
339701999310,11cyclictest34231022cut19:32:522
3397015993127,3cyclictest3468635-21apt-get20:20:001
3397015993127,3cyclictest3401707-21kworker/u8:3+flush-8:019:45:361
3397015993123,6cyclictest3439454-21apt-get19:52:341
3397015993123,6cyclictest275-21systemd-journal21:25:001
3397013993126,4cyclictest3688056-21kworker/u8:0+flush-8:000:12:410
3397013993126,3cyclictest3563016-21kworker/u8:3+flush-8:022:47:570
3397019993025,3cyclictest3503493-21latency_hist20:55:002
3397019993010,3cyclictest36153972tr22:47:472
3397015993021,7cyclictest3397330-21/usr/sbin/munin19:12:471
3397013993026,3cyclictest3401707-21kworker/u8:3+flush-8:020:02:490
3397013993026,2cyclictest3656774-21kworker/u8:3+events_unbound23:30:010
3397013993024,5cyclictest3439258-21kworker/u8:1+events_unbound22:12:520
3397013993017,11cyclictest0-21swapper/023:47:430
3397019992924,3cyclictest3509265-21fschecks_time21:02:402
3397015992924,4cyclictest3543219-21kworker/u8:0+flush-8:022:02:421
3397015992924,3cyclictest3489728-21irqcore20:42:421
3397015992923,4cyclictest3523358-21unixbench_singl21:12:561
3397015992923,4cyclictest3478786-21latency_hist20:30:001
3397015992921,6cyclictest3401707-21kworker/u8:3+flush-8:020:47:551
3397015992921,6cyclictest3401707-21kworker/u8:3+flush-8:020:47:551
3397013992925,3cyclictest3563016-21kworker/u8:3+flush-8:022:03:480
3397013992925,3cyclictest3365605-21kworker/u8:2+flush-8:020:10:490
3397013992924,4cyclictest3598201-21kworker/u8:2+events_unbound22:42:500
3397013992924,3cyclictest3638371-21cut23:12:390
3397013992923,4cyclictest3553279-21unixbench_singl21:42:560
3397013992923,4cyclictest3523579-21kworker/u8:2+flush-8:021:52:390
3397019992824,3cyclictest3656774-21kworker/u8:3+flush-8:023:27:542
3397019992824,2cyclictest3569289-21fschecks_count22:02:382
3397019992823,3cyclictest3662141-21unixbench_multi23:32:542
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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