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2026-03-19 - 03:49

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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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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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack2slot7s.osadl.org (updated Wed Mar 18, 2026 19:54:54)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2335794998271,5cyclictest0-21swapper/217:40:422
2335794996857,7cyclictest3159417-21sh18:10:422
2335793996539,23cyclictest3180202-21multi.sh18:11:351
2335793996446,14cyclictest2574624-21wc17:40:361
2335793995834,20cyclictest3069056-21sh18:07:051
2335793995834,20cyclictest3069056-21sh18:07:051
2335792995435,15cyclictest2640360-21sh17:43:260
2335794995342,7cyclictest2649001-21Run18:01:152
2335793995336,9cyclictest1167-21mta-sts-daemon17:50:371
2335793995323,6cyclictest2739351-21spawn18:03:101
2335792995034,6cyclictest3215114-21sh18:12:580
2335792994840,5cyclictest3091855-21sh18:08:000
2335792994840,5cyclictest3091855-21sh18:08:000
2335794994738,6cyclictest3094966-21sh18:08:072
2335794994738,6cyclictest3094966-21sh18:08:072
2335794994734,9cyclictest2565740-21multi.sh17:40:012
2335793994726,3cyclictest0-21swapper/117:15:331
233579399465,16cyclictest1166-21mta-sts-daemon17:56:131
2335792994627,11cyclictest12450irq/32-eth017:20:370
2335794994436,5cyclictest2644322-21execl17:50:242
2335794994234,5cyclictest2338774-21munin-run17:15:002
2335794994233,5cyclictest0-21swapper/217:20:372
2335793994235,3cyclictest0-21swapper/117:50:031
2335792994236,4cyclictest2644321-21execl17:50:280
2335794994033,4cyclictest2644069-21execl17:50:012
2335794994031,5cyclictest3606335-21systemd-logind17:10:012
2335794994031,5cyclictest2647261-21Run17:58:282
233579499402,32cyclictest2342310-21fstime17:25:322
2335792994029,9cyclictest2797583-21spawn18:03:260
2335793993931,5cyclictest2343654-21cron17:30:001
2335793993830,5cyclictest3222701-21latency_hist18:40:011
2335793993830,5cyclictest3222701-21latency_hist18:40:011
2335793993829,6cyclictest2565925-21tee17:40:021
2335792993831,5cyclictest2566009-21sh17:40:020
2335793993725,9cyclictest3217546-21ntp_kernel_pll_18:20:331
233579399363,29cyclictest2344604-21pipe17:30:371
2335793993628,5cyclictest1166-21mta-sts-daemon17:20:271
2335792993631,3cyclictest2644072-21execl17:50:030
2335792993427,4cyclictest3215668-21fschecks_count18:15:270
2335794993123,5cyclictest3222450-21timerwakeupswit18:35:452
2335794993123,5cyclictest3222450-21timerwakeupswit18:35:452
233579299311,3cyclictest171rcu_preempt18:20:390
2335794993025,2cyclictest0-21swapper/218:30:002
233579299307,13cyclictest171rcu_preempt17:10:370
2335792993024,3cyclictest0-21swapper/017:57:030
2335792993023,4cyclictest2336307-21fschecks_time17:05:280
2335792993021,7cyclictest12450irq/32-eth017:25:390
2335794992922,4cyclictest2344192-21fschecks_count17:30:262
2335793992924,4cyclictest2335791-21cyclictest17:05:331
2335793992922,4cyclictest3215686-21fschecks_time18:15:271
2335794992822,3cyclictest3218046-21grep18:20:442
2335794992819,5cyclictest3216681-21sendmail18:20:012
2335794992817,2cyclictest3220474-21cut18:30:312
2335794992817,2cyclictest3220474-21cut18:30:312
2335792992822,4cyclictest3222649-21munin-run18:40:000
2335792992822,4cyclictest3222649-21munin-run18:40:000
2335792992821,5cyclictest636-21in:imuxsock18:35:010
2335792992821,5cyclictest636-21in:imuxsock18:35:010
2335794992720,4cyclictest2335931-21latency_hist17:05:022
2335793992618,5cyclictest1030359-21cups-browsed17:14:491
2335792992620,4cyclictest2408992-21spawn17:33:580
2335792992616,8cyclictest3606321-21systemd-journal17:05:010
2335794992417,4cyclictest2339376-21fschecks_time17:15:282
233579299246,12cyclictest1030359-21cups-browsed17:15:220
2335792992415,3cyclictest3216691-21kworker/u8:1-xprtiod18:25:220
2335793992213,7cyclictest3220426-21missed_timers18:30:301
2335793992213,7cyclictest3220426-21missed_timers18:30:301
233579399214,14cyclictest1030359-21cups-browsed18:25:251
2335793992010,7cyclictest3606335-21systemd-logind17:05:011
233579599183,9cyclictest0-21swapper/318:10:393
233579599182,11cyclictest0-21swapper/317:50:433
233579599181,8cyclictest0-21swapper/317:55:323
233579599173,8cyclictest0-21swapper/317:40:343
233579599172,8cyclictest0-21swapper/317:20:373
233579599172,6cyclictest0-21swapper/317:35:343
233579599171,7cyclictest0-21swapper/317:45:343
233579599168,5cyclictest431ktimers/317:05:013
233579599153,8cyclictest0-21swapper/318:00:103
233579599151,7cyclictest0-21swapper/318:05:363
233579599151,7cyclictest0-21swapper/318:05:363
233579599151,6cyclictest0-21swapper/318:15:373
233579599142,7cyclictest0-21swapper/317:15:013
233579599141,7cyclictest0-21swapper/318:30:343
233579599141,7cyclictest0-21swapper/318:30:343
233579599141,5cyclictest0-21swapper/317:05:343
233579599133,6cyclictest0-21swapper/317:25:333
233579599131,7cyclictest0-21swapper/317:35:013
233579599131,6cyclictest0-21swapper/318:25:323
233579599103,5cyclictest0-21swapper/318:20:343
233579599102,5cyclictest0-21swapper/317:15:333
23357959990,6cyclictest0-21swapper/318:35:463
23357959990,6cyclictest0-21swapper/318:35:463
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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