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2026-04-30 - 02:05

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #c, 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 100 highest latencies:
System rackcslot7s.osadl.org (updated Wed Apr 29, 2026 12:44:44)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
274479022650,9sleep10-21swapper/107:05:221
274415522290,9sleep00-21swapper/007:05:120
28284922980,4sleep02828487-21cron11:05:000
139099940,52rtkit-daemon0-21swapper/207:09:222
274526826141,14sleep30-21swapper/307:05:493
28525682490,3sleep32852116-40unattended-upgr12:10:163
27991612470,4sleep20-21swapper/209:40:142
27933202320,9sleep013-21ksoftirqd/009:25:000
2745740992924,4cyclictest2775985-21perf08:35:003
2745733992917,10cyclictest2833970-21apt11:20:100
2745735992612,10cyclictest2852116-21unattended-upgr12:10:101
27576412250,4sleep10-21swapper/107:40:181
2745740992415,7cyclictest2787723-21users09:05:223
274574099240,11cyclictest28061712cstates10:00:123
274573899244,18cyclictest2838908-21munin-run11:35:002
2745735992415,6cyclictest436-20systemd-journal09:36:061
2745735992411,11cyclictest2793324-21turbostat.cron09:25:001
274574099232,17cyclictest2770173-21python308:15:193
2745740992311,10cyclictest2828532-21unin-run11:05:003
274574099230,21cyclictest2819826-21cron10:40:003
2745738992315,6cyclictest2818735-21df10:35:112
2745738992315,6cyclictest2771910-21sensors_temp08:20:192
2745738992314,7cyclictest2852513-21df12:10:122
2745733992321,1cyclictest0-21swapper/007:31:530
2745733992311,5cyclictest13-21ksoftirqd/008:05:500
274573399230,21cyclictest0-21swapper/010:09:420
274574099228,12cyclictest42-21ksoftirqd/308:09:573
2745738992220,1cyclictest0-21swapper/211:05:532
2745738992220,1cyclictest0-21swapper/209:16:512
274573899220,20cyclictest2784678-21systemctl09:00:002
274573899220,20cyclictest0-21swapper/211:25:342
2745735992220,1cyclictest3056-21PK-Backend07:31:401
2745735992220,1cyclictest0-21swapper/111:50:151
2745735992220,1cyclictest0-21swapper/111:48:261
2745735992220,1cyclictest0-21swapper/109:33:541
274573599220,20cyclictest2764466-21df08:00:121
274573399221,19cyclictest2811163-21munin-run10:15:000
2745733992211,4cyclictest13-21ksoftirqd/011:12:200
2745733992211,4cyclictest13-21ksoftirqd/009:55:250
2745733992210,4cyclictest13-21ksoftirqd/011:51:400
2745733992210,4cyclictest13-21ksoftirqd/008:37:460
2745733992210,4cyclictest13-21ksoftirqd/008:16:030
274574099213,2cyclictest141rcu_preempt11:29:593
274574099210,9cyclictest28503742wc12:05:163
2745738992119,1cyclictest0-21swapper/212:32:252
2745738992119,1cyclictest0-21swapper/210:46:402
2745738992119,1cyclictest0-21swapper/210:27:282
2745738992119,1cyclictest0-21swapper/210:15:442
2745738992119,1cyclictest0-21swapper/209:37:332
2745738992119,1cyclictest0-21swapper/209:31:312
2745738992119,1cyclictest0-21swapper/209:22:512
2745738992119,1cyclictest0-21swapper/209:13:262
2745738992119,1cyclictest0-21swapper/208:37:442
2745738992119,1cyclictest0-21swapper/208:01:482
2745738992119,1cyclictest0-21swapper/207:54:242
2745738992119,1cyclictest0-21swapper/207:22:542
2745738992119,1cyclictest0-21swapper/207:18:212
2745738992114,5cyclictest2851555-21mktemp12:10:002
2745738992114,5cyclictest2847561-21apt-get12:00:022
2745738992112,7cyclictest2801980-21apt-get09:50:002
274573899210,20cyclictest0-21swapper/210:07:542
274573899210,20cyclictest0-21swapper/207:12:332
274573899210,19cyclictest3056-21PK-Backend07:27:132
2745735992119,1cyclictest3056-21PK-Backend10:37:361
2745735992119,1cyclictest3056-21PK-Backend09:29:421
2745735992119,1cyclictest3056-21PK-Backend09:15:091
2745735992119,1cyclictest0-21swapper/112:29:161
2745735992119,1cyclictest0-21swapper/111:26:301
2745735992119,1cyclictest0-21swapper/107:53:031
2745735992119,1cyclictest0-21swapper/107:46:411
2745735992119,1cyclictest0-21swapper/107:14:091
2745735992118,2cyclictest3056-21PK-Backend12:18:061
2745735992118,2cyclictest0-21swapper/111:20:001
2745735992114,5cyclictest2810581-21awk10:10:221
2745735992113,6cyclictest2762766-21fw_packets07:55:161
274573599210,19cyclictest3056-21PK-Backend10:41:011
274573599210,19cyclictest3056-21PK-Backend08:09:451
274573399219,5cyclictest13-21ksoftirqd/009:06:210
274573399219,4cyclictest13-21ksoftirqd/012:18:000
274573399219,4cyclictest13-21ksoftirqd/009:26:300
274573399219,4cyclictest13-21ksoftirqd/009:11:170
2745733992119,1cyclictest3056-21PK-Backend12:36:320
2745733992119,1cyclictest3056-21PK-Backend08:30:340
2745733992119,1cyclictest3056-21PK-Backend08:21:550
2745733992119,1cyclictest0-21swapper/012:29:420
2745733992119,1cyclictest0-21swapper/011:47:580
2745733992119,1cyclictest0-21swapper/011:25:540
2745733992119,1cyclictest0-21swapper/010:28:150
2745733992119,1cyclictest0-21swapper/010:18:220
2745733992119,1cyclictest0-21swapper/009:50:510
2745733992119,1cyclictest0-21swapper/009:17:170
2745733992119,1cyclictest0-21swapper/008:54:400
2745733992119,1cyclictest0-21swapper/007:26:460
2745733992119,1cyclictest0-21swapper/007:23:480
2745733992119,1cyclictest0-21swapper/007:10:300
2745733992110,4cyclictest13-21ksoftirqd/012:24:040
2745733992110,4cyclictest13-21ksoftirqd/010:47:500
2745733992110,4cyclictest13-21ksoftirqd/010:39:200
2745733992110,4cyclictest13-21ksoftirqd/009:42:410
2745733992110,4cyclictest13-21ksoftirqd/007:17:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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