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2026-05-18 - 20:01

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 Mon May 18, 2026 12:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
100058421030,4sleep33056-21PK-Backend11:40:143
1390991020,86rtkit-daemon0-21swapper/207:08:552
10094132970,2sleep20-21swapper/212:05:202
139099920,75rtkit-daemon0-21swapper/307:05:273
90369527641,29sleep00-21swapper/007:06:240
9587752650,4sleep33056-21PK-Backend09:40:213
9764052640,4sleep33056-21PK-Backend10:30:223
90249626344,13sleep10-21swapper/107:05:041
9786762510,3sleep3978675-21apt10:40:003
139099450,3rtkit-daemon3056-21PK-Backend12:35:013
10199572390,2sleep10-21swapper/112:35:231
9298912340,5sleep10-21swapper/108:20:111
9656842280,3sleep23056-21PK-Backend10:00:202
9559242280,4sleep0161rcuc/009:35:010
90411599280,9cyclictest0-21swapper/011:39:590
90412899250,12cyclictest42-21ksoftirqd/309:35:213
904123992520,4cyclictest948787-21rm09:15:012
90411599250,16cyclictest0-21swapper/012:05:120
10124332250,10sleep013-21ksoftirqd/012:15:130
9690102240,7sleep342-21ksoftirqd/310:10:173
904128992421,2cyclictest3056-21PK-Backend08:20:193
90411599241,6cyclictest911738-21ls07:30:000
904115992411,12cyclictest956371-21cstates09:35:140
90411599240,15cyclictest0-21swapper/011:10:110
90412899230,21cyclictest3056-21PK-Backend08:00:323
904123992316,5cyclictest946953-21cron09:09:592
904123992312,9cyclictest962851-21unin-run09:55:002
90411599230,9cyclictest907403-21python307:15:200
90411599230,8cyclictest975244-21systemd-run10:30:000
90411599230,21cyclictest1004197-21awk11:50:180
90411599230,14cyclictest0-21swapper/011:20:110
904128992210,2cyclictest141rcu_preempt08:41:233
90412899220,20cyclictest3056-21PK-Backend07:39:113
904123992220,1cyclictest0-21swapper/211:59:332
904123992220,1cyclictest0-21swapper/210:41:002
90412399221,2cyclictest0-21swapper/209:58:482
90412399220,21cyclictest0-21swapper/212:15:152
90412399220,21cyclictest0-21swapper/207:35:442
904118992214,6cyclictest988527-21cut11:05:181
904115992220,1cyclictest0-21swapper/011:19:150
904115992220,1cyclictest0-21swapper/010:53:130
904115992215,5cyclictest913853-21rm07:35:010
90411599220,9cyclictest933375-21apt08:30:120
90411599220,9cyclictest0-21swapper/010:40:120
90411599220,20cyclictest0-21swapper/012:00:590
90411599220,13cyclictest0-21swapper/012:13:420
139099220,2rtkit-daemon3056-21PK-Backend11:18:483
139099220,16rtkit-daemon3056-21PK-Backend12:29:273
139099220,15rtkit-daemon3056-21PK-Backend08:52:133
139099220,15rtkit-daemon3056-21PK-Backend07:52:393
139099220,15rtkit-daemon3056-21PK-Backend07:47:393
139099220,14rtkit-daemon3056-21PK-Backend10:08:342
9428982210,5sleep20-21swapper/208:55:212
9179152210,11chrt34-21ksoftirqd/207:45:162
904128992119,1cyclictest3056-21PK-Backend11:38:263
904128992119,1cyclictest3056-21PK-Backend09:29:283
904128992119,1cyclictest3056-21PK-Backend08:58:393
904128992119,1cyclictest0-21swapper/311:05:213
904128992118,2cyclictest3056-21PK-Backend10:20:113
904128992118,2cyclictest3056-21PK-Backend07:26:193
90412899210,20cyclictest3056-21PK-Backend10:54:183
90412899210,19cyclictest3056-21PK-Backend09:20:563
90412899210,19cyclictest3056-21PK-Backend07:34:383
904123992119,1cyclictest0-21swapper/212:12:582
904123992119,1cyclictest0-21swapper/211:50:552
904123992119,1cyclictest0-21swapper/211:46:362
904123992119,1cyclictest0-21swapper/211:01:212
904123992119,1cyclictest0-21swapper/210:34:232
904123992119,1cyclictest0-21swapper/209:49:362
904123992119,1cyclictest0-21swapper/208:37:292
904123992119,1cyclictest0-21swapper/207:43:562
90412399210,20cyclictest0-21swapper/212:01:512
90412399210,20cyclictest0-21swapper/210:46:202
90412399210,20cyclictest0-21swapper/210:46:202
90412399210,20cyclictest0-21swapper/210:21:262
90412399210,20cyclictest0-21swapper/209:38:332
90412399210,20cyclictest0-21swapper/209:26:312
90412399210,1cyclictest0-21swapper/212:35:512
90412399210,1cyclictest0-21swapper/209:18:192
90411899210,20cyclictest0-21swapper/110:35:191
904115992119,1cyclictest0-21swapper/010:13:590
904115992119,1cyclictest0-21swapper/008:49:420
904115992119,1cyclictest0-21swapper/007:22:020
90411599210,9cyclictest0-21swapper/008:59:590
90411599210,8cyclictest0-21swapper/011:34:090
90411599210,8cyclictest0-21swapper/008:40:120
90411599210,5cyclictest918982-21turbostat07:50:000
90411599210,20cyclictest0-21swapper/011:59:450
90411599210,20cyclictest0-21swapper/011:40:370
90411599210,20cyclictest0-21swapper/011:08:470
90411599210,20cyclictest0-21swapper/008:13:200
90411599210,19cyclictest0-21swapper/011:02:400
90411599210,19cyclictest0-21swapper/009:15:310
139099210,15rtkit-daemon3056-21PK-Backend12:31:423
139099210,15rtkit-daemon3056-21PK-Backend11:56:153
139099210,15rtkit-daemon3056-21PK-Backend11:10:463
139099210,15rtkit-daemon3056-21PK-Backend10:42:243
139099210,15rtkit-daemon0-21swapper/211:41:312
139099210,14rtkit-daemon3056-21PK-Backend10:26:593
904128992018,1cyclictest3056-21PK-Backend07:22:333
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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