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2025-12-17 - 21:08

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 792 highest latencies:
System rack2slot7s.osadl.org (updated Wed Dec 17, 2025 07:55:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2517870996852,12cyclictest2522521-21kworker/u8:14+xprtiod05:56:090
2517870995544,8cyclictest3321173-21sort06:09:460
2517871995446,5cyclictest3326255-21sort06:10:011
2517870995344,6cyclictest2826091-21execl05:49:420
2517870995240,9cyclictest2749472-21sh05:40:280
2517870995240,9cyclictest2749472-21sh05:40:280
2517870995044,4cyclictest3372990-21sh06:11:500
2517871994941,5cyclictest3357970-21sort06:11:161
2517872994839,5cyclictest3385421-21sh06:12:212
2517872994740,4cyclictest3310132-21multi.sh06:09:192
2517872994738,5cyclictest0-21swapper/205:34:442
2517871994638,5cyclictest2815202-21rm05:43:111
2517871994638,5cyclictest2815202-21rm05:43:111
2517872994537,5cyclictest2752365-21sh05:40:352
2517872994537,5cyclictest2752365-21sh05:40:352
251787099450,5cyclictest2652309-21spawn05:34:460
2517872994436,5cyclictest2828089-21timerwakeupswit05:55:012
2517871994436,5cyclictest2826567-21unixbench_multi05:49:481
2517870994436,5cyclictest1-21systemd06:40:010
251787299434,30cyclictest2739177-21sort05:39:432
2517871994335,5cyclictest2520855-21systemd-run05:15:011
251787099431,37cyclictest2522803-21fstime05:24:430
2517871994235,5cyclictest2652309-21spawn05:34:421
2517871994134,4cyclictest2513815-21kworker/u8:8-xprtiod05:24:111
2517872994034,3cyclictest0-21swapper/205:49:382
2517872994026,7cyclictest0-21swapper/206:24:442
2517871994032,5cyclictest3108351-21spawn06:03:581
2517871994032,5cyclictest2743673-21grep05:40:021
2517870994031,7cyclictest12450irq/32-eth006:24:510
2517872993830,5cyclictest1168-21mta-sts-daemon05:14:432
2517871993829,6cyclictest1-21systemd05:20:011
2517871993627,6cyclictest2826964-21Run05:52:021
2517870993629,4cyclictest0-21swapper/005:39:370
2517872993526,6cyclictest3158422-21spawn06:04:092
2517871993529,3cyclictest0-21swapper/106:25:011
2517870993529,4cyclictest3173454-21spawn06:04:120
2517872993325,5cyclictest2525553-21pipe05:30:012
2517872993316,11cyclictest2828521-21sshd05:56:152
2517870993328,3cyclictest0-21swapper/005:15:010
251787199322,26cyclictest1166-21mta-sts-daemon06:29:391
2517870993224,5cyclictest563-21avahi-daemon05:19:450
2517870993217,12cyclictest0-21swapper/005:50:130
2517872993123,5cyclictest2401394-21cups-browsed05:19:342
2517871993125,3cyclictest0-21swapper/106:35:011
2517871993123,5cyclictest2525460-21unixbench_multi05:29:471
2517872993012,4cyclictest171rcu_preempt06:39:422
251787299300,8cyclictest2518763-21ntpq05:09:372
251787199300,5cyclictest171rcu_preempt05:59:491
2517871992920,6cyclictest3410469-21idleruntime-cro06:40:011
251787299283,20cyclictest1167-21mta-sts-daemon06:19:382
2517872992823,3cyclictest0-21swapper/205:24:422
2517871992822,3cyclictest0-21swapper/105:09:371
251787099281,23cyclictest2524483-21Run05:29:400
2517870992719,6cyclictest3409001-21munin-run06:35:010
2517872992619,4cyclictest1167-21mta-sts-daemon06:33:182
2517872992613,10cyclictest351ktimers/206:29:442
251787099264,12cyclictest1166-21mta-sts-daemon06:19:390
2517871992517,5cyclictest2517891-21latency_hist05:05:011
2517870992519,4cyclictest0-21swapper/005:05:000
251787199242,4cyclictest171rcu_preempt06:19:411
251787399234,12cyclictest0-21swapper/305:56:143
251787299235,2cyclictest171rcu_preempt05:05:012
2517870992310,3cyclictest0-21swapper/005:09:450
251787099210,4cyclictest171rcu_preempt06:29:400
251787399205,9cyclictest0-21swapper/305:49:373
251787399204,10cyclictest0-21swapper/305:39:383
251787399193,10cyclictest0-21swapper/306:00:233
251787399192,12cyclictest0-21swapper/306:09:433
251787399184,8cyclictest0-21swapper/305:51:113
251787399183,9cyclictest0-21swapper/305:24:423
251787399174,9cyclictest0-21swapper/306:10:453
251787399173,5cyclictest0-21swapper/305:19:393
251787399172,8cyclictest0-21swapper/306:40:013
251787399172,7cyclictest0-21swapper/305:27:573
251787399171,7cyclictest0-21swapper/306:19:423
251787399171,10cyclictest0-21swapper/305:34:403
251787399162,8cyclictest0-21swapper/306:34:403
251787399161,7cyclictest0-21swapper/305:14:443
251787399161,10cyclictest0-21swapper/305:42:183
251787399161,10cyclictest0-21swapper/305:42:183
251787399153,7cyclictest0-21swapper/306:24:503
251787399151,6cyclictest0-21swapper/306:29:403
251787399142,8cyclictest0-21swapper/305:10:013
251787399102,7cyclictest0-21swapper/305:05:003
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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