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2025-12-07 - 12:16

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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 50 highest latencies:
System rack3slot6s.osadl.org (updated Sun Dec 07, 2025 00:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10114211996,15sleep10-21swapper/119:05:151
2595521170,1sleep00-21swapper/021:05:000
98982113102,6sleep00-21swapper/019:05:110
11427210694,6sleep20-21swapper/219:06:442
11388210695,6sleep30-21swapper/319:06:133
12842800,1sleep20-21swapper/223:34:172
309442740,3sleep01171299cyclictest21:12:210
262252700,0sleep10-21swapper/100:35:131
17652540,0sleep10-21swapper/121:50:181
287562240,1sleep30-21swapper/323:28:453
181272220,1sleep0101ktimersoftd/000:25:300
1171699210,19cyclictest0-21swapper/321:30:143
143802190,1sleep123-21ksoftirqd/122:38:401
11715991916,2cyclictest6584-21kworker/u8:123:09:042
1171699180,3cyclictest0-21swapper/322:40:133
11715991815,2cyclictest30669-21kworker/u8:121:50:042
11715991815,2cyclictest23667-21kworker/u8:023:41:052
11715991815,2cyclictest23667-21kworker/u8:023:41:042
304252170,1sleep10-21swapper/121:45:411
11715991714,2cyclictest28702-21kworker/u8:122:26:052
11716991611,3cyclictest0-21swapper/320:30:163
11715991613,2cyclictest19491-21kworker/u8:022:18:012
11715991613,2cyclictest19491-21kworker/u8:022:04:052
11715991613,2cyclictest19491-21kworker/u8:021:49:042
1171599160,2cyclictest0-21swapper/221:43:042
11713991611,3cyclictest0-21swapper/119:50:261
11712991613,2cyclictest19491-21kworker/u8:021:43:040
1171299161,13cyclictest19431-21aten2.4_r3power21:35:120
1171699151,3cyclictest8292-21ssh21:57:003
11716991510,3cyclictest12244-21timerwakeupswit22:35:273
1171699150,13cyclictest27897-21diskmemload23:53:583
1171699150,13cyclictest27897-21diskmemload21:54:043
1171699150,13cyclictest0-21swapper/300:00:153
11715991512,2cyclictest6173-21kworker/u8:100:36:042
11715991512,2cyclictest572-21kworker/u8:021:17:052
11715991512,2cyclictest572-21kworker/u8:021:17:042
11715991512,2cyclictest19491-21kworker/u8:022:06:012
11715991512,2cyclictest18883-21kworker/u8:223:28:052
1171599151,12cyclictest8538-21rm21:23:132
1171599150,13cyclictest0-21swapper/222:10:012
1171599150,13cyclictest0-21swapper/219:40:142
1171399159,4cyclictest0-21swapper/122:48:091
1171399151,12cyclictest32517-21apt-get21:15:071
1171399151,12cyclictest32517-21apt-get21:15:071
11713991510,3cyclictest0-21swapper/122:07:241
1171399150,2cyclictest27897-21diskmemload22:25:181
1171399150,13cyclictest0-21swapper/122:57:171
1171399150,13cyclictest0-21swapper/122:14:571
1171299151,12cyclictest0-21swapper/023:35:090
1171299151,12cyclictest0-21swapper/023:35:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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