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2026-03-17 - 08:19

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 792 highest latencies:
System rack2slot7s.osadl.org (updated Mon Mar 16, 2026 19:54:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1760669997465,6cyclictest2000186-21expr17:40:362
1760668996052,5cyclictest2002077-21expr17:40:421
1760668995849,5cyclictest2587459-21sh18:10:411
1760667995439,12cyclictest2612425-21sh18:11:430
1760669995344,5cyclictest2584667-21tee18:10:342
1760667995244,6cyclictest2070120-21execl17:50:360
1760668995045,3cyclictest0-21swapper/117:20:381
1760667995039,6cyclictest2000974-21rm17:40:380
176066999493,38cyclictest1765635-21execl17:20:372
1760668994940,5cyclictest2501200-21sh18:07:131
1760669994839,5cyclictest2550830-21sh18:09:132
1760668994837,7cyclictest2070860-21execl17:50:401
1760667994840,5cyclictest1957700-21munin-run17:35:010
1760667994835,10cyclictest2513139-21sh18:07:450
1760668994737,6cyclictest2649616-21systemd-run18:35:011
1760668994637,6cyclictest0-21swapper/117:15:011
1760667994630,10cyclictest2073043-21fstime17:57:450
1760669994434,5cyclictest0-21swapper/217:50:252
1760669994433,8cyclictest351ktimers/217:10:372
1760669994332,7cyclictest2073462-21Run18:00:132
1760668994331,5cyclictest261rcuc/117:45:361
1760669994133,5cyclictest2651124-21systemd-run18:40:012
1760667994131,7cyclictest1762149-21latency_hist17:10:010
1760669994032,5cyclictest1957714-21systemd-run17:35:012
1760668994031,6cyclictest2128769-21spawn18:03:021
1760667994032,5cyclictest2069740-21Run17:47:170
1760669993930,5cyclictest2069867-21execl17:50:022
1760669993830,5cyclictest1992162-21multi.sh17:40:032
1760668993829,6cyclictest2647698-21mailstats18:25:451
1760668993829,6cyclictest0-21swapper/117:40:011
1760668993728,5cyclictest2071739-21fstime17:55:261
1760667993630,4cyclictest2074903-21Run18:02:200
1760667993623,8cyclictest151ktimers/017:15:380
176066999352,29cyclictest1767140-21fstime17:25:402
1760668993528,5cyclictest1831979-21spawn17:33:541
1760668993429,2cyclictest0-21swapper/118:20:011
1760668993412,5cyclictest28-21ksoftirqd/118:20:361
1760667993320,8cyclictest0-21swapper/018:35:350
1760669993226,3cyclictest0-21swapper/217:57:022
1760669993225,4cyclictest2649471-21unixbench_multi18:30:452
176066999319,15cyclictest351ktimers/218:15:332
1760669993123,5cyclictest1765373-21cron17:20:012
1760668993119,7cyclictest1768463-21fstime17:28:121
1760667993125,4cyclictest1992142-21sh17:40:020
1760667993121,7cyclictest1766752-21unixbench-2d17:20:490
176066999306,20cyclictest559542-21munin-node18:25:382
176066899309,3cyclictest261rcuc/117:05:321
176066899309,18cyclictest0-21swapper/117:15:371
1760667993024,3cyclictest0-21swapper/017:15:010
1760667993023,5cyclictest1767424-21cpuspeed17:25:260
1760667992921,5cyclictest0-21swapper/018:20:010
176066799283,19cyclictest763-21snmpd18:20:330
176066799283,16cyclictest151ktimers/018:30:350
176066899266,4cyclictest28-21ksoftirqd/118:35:321
1760669992416,3cyclictest0-21swapper/217:05:312
176066799243,15cyclictest151ktimers/018:25:360
176066999238,10cyclictest1166-21mta-sts-daemon18:20:392
1760669992217,3cyclictest0-21swapper/217:05:012
176066899227,3cyclictest271ktimers/117:05:011
176067099192,11cyclictest0-21swapper/318:10:403
176066799192,13cyclictest1760621-21munin-run17:05:010
176067099174,7cyclictest0-21swapper/317:40:343
176067099165,6cyclictest0-21swapper/317:45:333
176067099162,7cyclictest0-21swapper/318:00:353
176067099161,9cyclictest0-21swapper/317:50:433
176067099152,6cyclictest0-21swapper/317:25:383
176067099152,6cyclictest0-21swapper/317:15:343
176067099151,6cyclictest0-21swapper/318:25:383
176067099151,6cyclictest0-21swapper/317:35:413
176067099143,7cyclictest0-21swapper/317:56:143
176067099143,5cyclictest0-21swapper/318:20:333
176067099133,5cyclictest0-21swapper/317:30:353
176067099132,5cyclictest0-21swapper/318:05:053
176067099131,8cyclictest0-21swapper/317:20:363
176067099131,6cyclictest0-21swapper/318:35:333
176067099123,6cyclictest0-21swapper/318:15:343
176067099104,4cyclictest0-21swapper/318:30:333
176067099101,5cyclictest0-21swapper/317:10:303
17606709992,4cyclictest0-21swapper/317:05:313
17606709981,5cyclictest0-21swapper/317:05:023
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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