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2026-05-09 - 19:10

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 Sat May 09, 2026 12:44:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
418703827740,14sleep00-21swapper/007:06:030
418676427549,18sleep30-21swapper/307:05:263
418701526343,14sleep20-21swapper/207:05:462
418626826340,15sleep10-21swapper/107:05:171
64562530,3sleep33056-21PK-Backend07:45:003
336882430,4sleep03056-21PK-Backend09:00:190
4187490992816,10cyclictest82637-21python311:20:210
757572270,3sleep30-21swapper/311:00:213
139099270,4rtkit-daemon1389-21rtkit-daemon09:42:503
139099260,4rtkit-daemon1389-21rtkit-daemon10:17:123
139099260,4rtkit-daemon1389-21rtkit-daemon08:36:272
139099250,4rtkit-daemon1389-21rtkit-daemon08:38:553
139099250,4rtkit-daemon1389-21rtkit-daemon07:21:212
1095512250,3sleep2109533-21apt-get12:39:592
418750499231,6cyclictest436-20systemd-journal10:25:243
4187504992316,6cyclictest30202-21/usr/sbin/munin08:50:183
4187500992319,2cyclictest76565-21apt11:05:122
418750099230,21cyclictest8906-21/usr/sbin/munin07:50:162
418750099230,21cyclictest28082-21expr08:45:132
418749599233,5cyclictest26-21ksoftirqd/112:25:041
418749599230,21cyclictest7087-21hddtemp_smartct07:45:151
418749099232,19cyclictest436-20systemd-journal10:39:590
4187504992220,1cyclictest3056-21PK-Backend12:31:003
4187504992220,1cyclictest3056-21PK-Backend10:51:383
4187504992220,1cyclictest0-21swapper/309:08:223
4187504992220,1cyclictest0-21swapper/308:46:333
4187504992219,2cyclictest3056-21PK-Backend11:17:463
4187504992219,2cyclictest3056-21PK-Backend09:31:133
4187504992219,2cyclictest3056-21PK-Backend08:22:473
418750499220,20cyclictest3056-21PK-Backend11:41:123
418750499220,20cyclictest3056-21PK-Backend10:34:353
418750499220,20cyclictest3056-21PK-Backend10:34:353
4187500992220,1cyclictest0-21swapper/211:33:312
4187500992220,1cyclictest0-21swapper/211:24:032
4187500992220,1cyclictest0-21swapper/210:55:032
4187500992220,1cyclictest0-21swapper/209:33:382
418750099220,21cyclictest100569-21perf12:15:002
4187495992215,5cyclictest883-21dbus-daemon07:58:021
4187495992214,6cyclictest87553-21memory11:35:171
4187490992216,5cyclictest62160-21idleruntime-cro10:25:000
4187490992213,6cyclictest5332-21sshd07:40:150
139099220,4rtkit-daemon1389-21rtkit-daemon11:35:462
418750499219,10cyclictest42-21ksoftirqd/312:25:023
4187504992119,1cyclictest3056-21PK-Backend12:17:233
4187504992119,1cyclictest3056-21PK-Backend10:42:113
4187504992119,1cyclictest3056-21PK-Backend09:24:113
4187504992119,1cyclictest3056-21PK-Backend08:08:473
4187504992119,1cyclictest0-21swapper/312:13:093
4187504992119,1cyclictest0-21swapper/309:58:583
4187504992119,1cyclictest0-21swapper/309:01:193
4187504992119,1cyclictest0-21swapper/307:52:323
4187504992113,6cyclictest26754-21ntp_states08:40:183
418750499210,20cyclictest0-21swapper/308:32:263
418750499210,20cyclictest0-21swapper/308:11:043
4187500992119,1cyclictest0-21swapper/212:06:362
4187500992119,1cyclictest0-21swapper/210:19:152
4187500992119,1cyclictest0-21swapper/209:21:092
4187500992119,1cyclictest0-21swapper/208:51:142
4187500992119,1cyclictest0-21swapper/208:43:562
4187500992119,1cyclictest0-21swapper/208:04:442
4187500992119,1cyclictest0-21swapper/207:28:482
418750099210,20cyclictest3056-21PK-Backend08:25:322
418750099210,20cyclictest0-21swapper/211:04:102
418750099210,19cyclictest0-21swapper/208:20:112
4187495992119,1cyclictest0-21swapper/111:00:021
4187495992119,1cyclictest0-21swapper/110:35:421
4187495992114,5cyclictest1-21systemd07:40:001
418749599210,20cyclictest0-21swapper/107:44:141
418749099210,20cyclictest0-21swapper/010:25:420
418749099210,20cyclictest0-21swapper/009:39:050
418749099210,20cyclictest0-21swapper/009:39:050
418749099210,20cyclictest0-21swapper/009:28:090
418749099210,20cyclictest0-21swapper/009:22:550
418749099210,20cyclictest0-21swapper/008:25:500
724142200,6sleep20-21swapper/210:50:202
4187504992018,1cyclictest3056-21PK-Backend11:36:593
4187504992018,1cyclictest3056-21PK-Backend10:49:003
4187504992018,1cyclictest0-21swapper/310:10:493
4187504992018,1cyclictest0-21swapper/310:08:463
4187504992018,1cyclictest0-21swapper/308:58:423
4187504992018,1cyclictest0-21swapper/307:10:063
418750499200,1cyclictest3056-21PK-Backend11:34:233
418750499200,1cyclictest3056-21PK-Backend10:21:083
418750499200,19cyclictest3056-21PK-Backend12:00:453
418750499200,19cyclictest3056-21PK-Backend11:47:483
418750499200,19cyclictest3056-21PK-Backend07:33:313
418750499200,19cyclictest0-21swapper/307:49:003
418750499200,18cyclictest3056-21PK-Backend12:35:133
418750499200,18cyclictest3056-21PK-Backend07:57:053
4187500992018,1cyclictest3056-21PK-Backend09:40:222
4187500992018,1cyclictest0-21swapper/212:23:382
4187500992018,1cyclictest0-21swapper/212:16:492
4187500992018,1cyclictest0-21swapper/212:03:112
4187500992018,1cyclictest0-21swapper/211:48:102
4187500992018,1cyclictest0-21swapper/211:26:412
4187500992018,1cyclictest0-21swapper/211:19:512
4187500992018,1cyclictest0-21swapper/210:26:042
4187500992018,1cyclictest0-21swapper/210:02:182
4187500992018,1cyclictest0-21swapper/209:57:242
4187500992018,1cyclictest0-21swapper/208:59:392
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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