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2026-08-19 - 11:15

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #3

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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot3s.osadl.org (updated Wed Aug 19, 2026 00:45:30)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2201459996930,35cyclictest2234542-21sh22:05:531
2201456996920,43cyclictest2298298-21run-parts00:20:000
2201459996823,41cyclictest23-21ksoftirqd/121:31:521
2201456996619,43cyclictest0-21swapper/021:51:360
220145999651,14cyclictest2290041-21ssh00:02:211
220145999651,14cyclictest2290041-21ssh00:02:201
2201464996419,9cyclictest30-21ksoftirqd/223:12:472
2201464996416,12cyclictest30-21ksoftirqd/222:53:332
2201464996416,12cyclictest30-21ksoftirqd/222:53:322
2201464996413,15cyclictest2239453-21ssh22:16:192
220145999642,15cyclictest2204774-21munin-run20:15:001
220145699641,36cyclictest131rcu_preempt23:03:300
220145699641,36cyclictest131rcu_preempt23:03:300
220146899631,38cyclictest2204503-21kworker/u8:120:20:023
2201464996320,9cyclictest30-21ksoftirqd/222:36:012
2201464996319,10cyclictest30-21ksoftirqd/221:34:542
2201464996317,9cyclictest30-21ksoftirqd/222:01:102
2201464996316,11cyclictest30-21ksoftirqd/220:20:022
220145999632,13cyclictest2206865-21munin-run20:55:011
2201459996321,38cyclictest2217001-21sh21:29:381
220145999631,9cyclictest3467602-21systemd-journal00:33:071
220145999631,9cyclictest3467602-21systemd-journal00:33:071
220145999622,13cyclictest2279804-21ssh23:40:511
220145999622,13cyclictest2279804-21ssh23:40:511
220145999621,9cyclictest2211502-21ssh21:17:531
220145999621,8cyclictest2270063-21ssh23:20:071
220145999621,8cyclictest2270063-21ssh23:20:071
220145999621,8cyclictest2255805-21ssh22:50:331
220145999621,8cyclictest2255805-21ssh22:50:331
220145999621,11cyclictest2213131-21ssh21:21:051
220145699627,31cyclictest16950irq/224-800000022:00:020
220146499615,19cyclictest2202097-21latency_hist19:20:022
2201464996119,9cyclictest30-21ksoftirqd/221:10:032
2201464996117,10cyclictest30-21ksoftirqd/200:35:002
2201464996117,10cyclictest30-21ksoftirqd/200:35:002
2201464996116,10cyclictest30-21ksoftirqd/223:09:522
2201464996115,8cyclictest30-21ksoftirqd/222:35:002
2201464996115,11cyclictest30-21ksoftirqd/223:39:492
2201464996114,10cyclictest30-21ksoftirqd/222:27:342
2201464996112,11cyclictest30-21ksoftirqd/200:03:182
2201464996112,11cyclictest30-21ksoftirqd/200:03:182
220145999613,21cyclictest2241110-21munin-run22:20:001
220145999612,8cyclictest364-21snmpd00:16:581
220145999612,13cyclictest2255344-21munin-run22:50:011
2201459996121,35cyclictest2269894-21latency_hist23:20:011
220145999611,8cyclictest2292091-21ssh00:06:371
220145999611,8cyclictest2285399-21ssh23:52:401
220145999611,8cyclictest2273878-21ssh23:28:391
220145999611,8cyclictest2265606-21ssh23:11:001
220145999611,8cyclictest2243739-21ssh22:25:031
220145999611,8cyclictest2242277-21ssh22:22:131
220145999611,7cyclictest2300924-21ssh00:25:031
220145999611,7cyclictest2227334-21ssh21:50:461
220145999611,10cyclictest2208795-21ssh21:12:031
2201456996117,14cyclictest275-21dbus-daemon22:10:010
2201464996014,10cyclictest30-21ksoftirqd/221:45:212
2201464996012,11cyclictest30-21ksoftirqd/221:52:262
220145999602,15cyclictest2250935-21ssh22:40:051
220145999602,14cyclictest2219942-21ssh21:35:271
220145999602,13cyclictest48-21kcompactd021:55:301
220145999601,8cyclictest2262329-21ssh23:04:281
220145999601,8cyclictest2262329-21ssh23:04:281
220145999601,8cyclictest2259889-21ssh22:59:141
220145999601,7cyclictest2305875-21ssh00:35:381
220145999601,12cyclictest2286930-21ssh23:55:421
220145699601,40cyclictest131rcu_preempt22:52:430
220145699601,40cyclictest131rcu_preempt22:52:430
2201464995920,9cyclictest30-21ksoftirqd/200:25:032
2201464995916,11cyclictest30-21ksoftirqd/223:05:022
2201464995916,11cyclictest30-21ksoftirqd/223:05:012
2201464995915,10cyclictest30-21ksoftirqd/221:40:382
2201464995912,9cyclictest30-21ksoftirqd/223:55:462
220145999593,5cyclictest364-21snmpd22:36:371
2201459995931,24cyclictest2276957-21sed23:35:021
220145999592,6cyclictest2295943-21munin-run00:15:011
220145999592,15cyclictest2236906-21ssh22:10:501
220145999591,8cyclictest2248117-21ssh22:34:441
220145999591,8cyclictest2223362-21ssh21:42:411
220145999591,7cyclictest364-21snmpd19:46:021
220145999591,7cyclictest2300039-21ssh00:23:301
220145999591,7cyclictest2300039-21ssh00:23:301
220145999591,7cyclictest2279053-21ssh23:39:391
2201459995916,38cyclictest1-21systemd19:15:011
220145999591,13cyclictest364-21snmpd23:06:081
220146499586,17cyclictest2204269-21/usr/sbin/munin20:05:012
2201464995815,8cyclictest30-21ksoftirqd/222:49:052
2201464995813,11cyclictest30-21ksoftirqd/223:49:372
220145999582,8cyclictest2226758-21munin-run21:50:001
220145999582,6cyclictest2205567-21munin-run20:30:001
220145999581,7cyclictest2232962-21ssh22:02:441
2201456995828,14cyclictest2307227-21ssh00:38:470
2201456995827,16cyclictest2254613-21ssh22:48:180
2201456995826,16cyclictest2273416-21ssh23:27:280
2201456995815,38cyclictest2279424-21cat23:40:040
2201464995717,8cyclictest30-21ksoftirqd/221:39:302
2201464995716,9cyclictest30-21ksoftirqd/222:42:162
2201464995715,10cyclictest30-21ksoftirqd/223:50:422
2201464995713,8cyclictest30-21ksoftirqd/200:37:092
220145999572,6cyclictest2205832-21munin-run20:35:011
220145999572,6cyclictest2204269-21munin-run20:05:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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