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2026-06-26 - 02:59

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 50 highest latencies:
System rack5slot4s.osadl.org (updated Fri Jun 26, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
408245921930,2sleep3481ktimers/321:30:253
40270042630,19sleep20-21swapper/220:35:172
3940311996344,17cyclictest4075251-21ntpq21:20:290
3940313996151,6cyclictest1704890-21systemd-journal22:45:171
3940313995953,4cyclictest4036614-21kworker/u8:1+flush-8:020:55:321
3940313995953,4cyclictest4036614-21kworker/u8:1+flush-8:020:55:311
3940313995852,4cyclictest4042096-21kworker/u8:0+flush-8:022:35:351
3940313995745,8cyclictest4080792-21kworker/u8:1+flush-8:021:30:291
3940311995545,7cyclictest4032156-21diskstats20:40:200
3940311995535,8cyclictest1704890-21systemd-journal19:20:000
3940313995447,5cyclictest11380-21kworker/u8:3+events_unbound23:55:171
3940313995445,6cyclictest1704890-21systemd-journal19:25:161
3940313995244,6cyclictest3947347-21kworker/u8:1+flush-8:019:30:351
3940313995242,7cyclictest1704890-21systemd-journal23:25:001
3940311995231,6cyclictest1704890-21systemd-journal22:15:010
3940313995145,4cyclictest3989849-21kworker/u8:2+events_unbound20:45:171
3940313995144,5cyclictest4075352-21kworker/u8:3+events_unbound21:20:361
3940311995128,7cyclictest4086121-21latency_hist21:35:020
3940313995045,4cyclictest3898260-21kworker/u8:3+flush-8:020:30:311
3940317994944,3cyclictest4042096-21kworker/u8:0+flush-8:022:45:292
3940313994839,7cyclictest4154963-21ntpq22:40:291
3940317994741,4cyclictest3989849-21kworker/u8:2+flush-8:020:00:202
3940313994739,6cyclictest71190-21latency_hist00:35:021
39899562460,4sleep375-21kworker/3:1-mm_percpu_wq19:55:263
3940313994640,5cyclictest4140692-21kworker/u8:1+events_unbound23:50:331
3940313994640,5cyclictest4140692-21kworker/u8:1+events_unbound23:50:331
3940313994640,5cyclictest3898260-21kworker/u8:3+events_unbound20:40:281
3940313994639,4cyclictest4042096-21kworker/u8:0+events_unbound21:00:331
3940313994636,7cyclictest4135213-21ntpq22:20:311
3940313994635,7cyclictest1704890-21systemd-journal23:10:011
3940311994637,6cyclictest3981932-21apt-get19:50:000
3940317994539,4cyclictest4140692-21kworker/u8:1+flush-8:023:25:352
3940313994539,4cyclictest4036614-21kworker/u8:1+events_unbound21:05:181
3940313994539,4cyclictest36757-21kworker/u8:1+events_unbound00:00:341
3940313994539,4cyclictest36757-21kworker/u8:1+events_unbound00:00:341
3940313994537,6cyclictest4140692-21kworker/u8:1+events_unbound23:30:351
3940311994536,6cyclictest46470-21latency_hist00:10:000
3940311994536,6cyclictest3997042-21latency_hist20:05:010
394031199451,42cyclictest1-21systemd21:05:000
3940313994437,5cyclictest4042096-21kworker/u8:0+events_unbound21:35:301
3940313994432,9cyclictest3996128-21ntpq20:00:281
39559322430,6sleep20-21swapper/219:20:262
3940317994333,7cyclictest1704890-21systemd-journal20:25:172
3940313994334,7cyclictest1704890-21systemd-journal22:05:001
3940313994331,9cyclictest1704890-21systemd-journal23:45:001
3940311994334,6cyclictest4031626-21latency_hist20:40:010
3940313994238,3cyclictest3989849-21kworker/u8:2+flush-8:020:20:321
3940313994235,5cyclictest4080792-21kworker/u8:1+flush-8:022:05:311
3940313994135,4cyclictest4140692-21kworker/u8:1+flush-8:022:30:321
3940311994135,4cyclictest4184722-21kworker/u8:0+flush-8:023:10:360
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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