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2025-12-21 - 08:58

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.

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 100 highest latencies:
System rack2slot7s.osadl.org (updated Sat Dec 20, 2025 19:55:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2534082997764,4cyclictest0-21swapper/117:39:441
2534083995647,5cyclictest3345843-21sort18:09:592
2534083995647,5cyclictest3345843-21sort18:09:592
2534081995346,5cyclictest2819435-21od17:42:400
2534083995143,5cyclictest2765031-21sh17:40:242
2534081995145,4cyclictest3269351-21sh18:06:560
2534081995145,4cyclictest3269351-21sh18:06:560
2534083995026,14cyclictest3367823-21sh18:10:492
2534083995026,14cyclictest3367823-21sh18:10:492
2534081995032,15cyclictest3390987-21sh18:11:440
2534081995032,15cyclictest3390987-21sh18:11:440
253408299491,34cyclictest3354196-21sh18:10:181
253408299491,34cyclictest3354196-21sh18:10:181
2534083994815,12cyclictest2842346-21execl17:49:512
2534082994833,12cyclictest2536984-21Run18:03:191
2534081994733,6cyclictest2842350-21execl17:49:460
2534082994537,5cyclictest3315483-21sh18:08:461
2534082994537,5cyclictest3315483-21sh18:08:461
2534082994537,5cyclictest2839081-21multi.sh17:43:271
2534082994537,5cyclictest2534086-21systemd-run17:05:001
2534081994535,8cyclictest2843924-21fstime17:55:020
2534082994436,5cyclictest2537064-21systemd-run17:15:011
2534083994334,6cyclictest2846240-21Run17:59:452
2534083994331,8cyclictest2901734-21spawn18:03:012
2534083994232,6cyclictest0-21swapper/217:39:452
2534082994134,4cyclictest2842350-21execl17:50:031
2534083994034,3cyclictest0-21swapper/217:51:092
2534081993932,4cyclictest2540264-21latency_hist17:25:020
2534083993831,3cyclictest0-21swapper/217:15:012
2534081993831,4cyclictest0-21swapper/017:39:430
2534083993723,8cyclictest3428106-21ntpq18:34:422
2534083993721,8cyclictest2534993-21ntpq17:09:452
2534082993725,9cyclictest2668352-21spawn17:34:491
2534081993731,4cyclictest3260992-21sh18:04:540
2534081993728,7cyclictest2724387-21munin-plugin-st17:35:010
2534083993622,10cyclictest3425248-21ntp_kernel_pll_18:24:462
2534081993629,5cyclictest2535525-21cron17:10:010
2534083993527,5cyclictest2682501-21spawn17:34:382
2534083993521,9cyclictest3429563-21ntpq18:39:432
2534083993511,8cyclictest2538950-21execl17:21:062
2534082993528,4cyclictest2538720-21kworker/u8:16-rpciod17:25:011
2534082993527,5cyclictest2526291-21kworker/u8:1+xprtiod17:20:011
2534081993517,12cyclictest151ktimers/018:34:440
2534083993423,7cyclictest2538562-21unixbench_multi17:19:542
2534082993430,2cyclictest0-21swapper/117:50:331
2534082993425,6cyclictest2845394-21Run17:56:021
2534083993322,8cyclictest2541176-21ntpq17:29:432
2534083993321,8cyclictest3423815-21ntpq18:19:482
2534083993321,8cyclictest3423815-21ntpq18:19:482
2534083993319,10cyclictest1212220-21cups-browsed18:27:022
2534082993327,3cyclictest0-21swapper/118:20:001
2534082993327,3cyclictest0-21swapper/118:20:001
2534081993226,4cyclictest2536875-21unixbench_multi17:14:540
2534081993225,5cyclictest3423656-21missed_timers18:19:420
2534081993225,5cyclictest3423656-21missed_timers18:19:420
2534082993123,5cyclictest3430192-21systemd-run18:40:011
2534081993126,2cyclictest0-21swapper/017:56:130
2534082993021,6cyclictest3425809-21systemd-run18:25:011
2534082993020,7cyclictest812-21cron18:30:011
2534081993018,10cyclictest0-21swapper/018:24:540
2534083992921,5cyclictest2534092-21systemd-run17:05:012
2534082992922,4cyclictest1168-21mta-sts-daemon17:27:041
2534081992821,5cyclictest3429780-21mailstats18:39:500
2534081992820,5cyclictest0-21swapper/017:29:400
2534081992614,10cyclictest0-21swapper/017:19:410
2534082992518,4cyclictest2535484-21unixbench_singl17:09:531
2534082992314,6cyclictest1167-21mta-sts-daemon18:33:311
253408199222,15cyclictest3426306-21diskstats18:29:370
253408499191,8cyclictest0-21swapper/317:19:473
2534081991915,2cyclictest0-21swapper/017:05:010
253408499183,9cyclictest0-21swapper/318:09:453
253408499183,9cyclictest0-21swapper/318:09:453
253408499183,8cyclictest0-21swapper/317:34:483
253408499182,10cyclictest0-21swapper/317:56:123
253408499182,10cyclictest0-21swapper/317:49:473
253408499177,6cyclictest0-21swapper/317:39:453
253408499173,8cyclictest0-21swapper/318:00:483
253408499171,10cyclictest0-21swapper/318:29:483
253408499161,7cyclictest0-21swapper/317:24:433
253408499159,4cyclictest0-21swapper/318:12:053
253408499159,4cyclictest0-21swapper/318:12:053
253408499157,5cyclictest0-21swapper/317:41:073
253408499151,7cyclictest0-21swapper/318:19:473
253408499151,7cyclictest0-21swapper/318:19:473
253408499148,4cyclictest0-21swapper/317:51:003
253408499141,7cyclictest0-21swapper/318:24:463
253408499137,4cyclictest0-21swapper/317:27:593
253408499126,4cyclictest0-21swapper/317:12:313
253408499126,4cyclictest0-21swapper/317:09:353
253408499121,6cyclictest0-21swapper/318:34:453
253408499115,4cyclictest0-21swapper/318:39:353
253408499106,2cyclictest0-21swapper/317:05:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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