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2025-11-18 - 10:43

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 100 highest latencies:
System rack3slot6s.osadl.org (updated Tue Nov 18, 2025 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16374211897,15sleep20-21swapper/219:08:542
163342117106,6sleep00-21swapper/019:08:230
163912116106,6sleep30-21swapper/319:09:063
16320210695,6sleep10-21swapper/119:08:121
295702820,1sleep20-21swapper/221:00:182
268612780,1sleep20-21swapper/223:19:352
12022720,1sleep30-21swapper/322:51:543
76152690,1sleep20-21swapper/222:59:152
258752590,1sleep30-21swapper/320:50:263
1648999361,33cyclictest0-21swapper/021:10:150
73732230,1sleep21649199cyclictest21:16:102
224892230,0sleep20-21swapper/200:21:282
224892230,0sleep20-21swapper/200:21:282
219282230,1sleep10-21swapper/120:40:271
50312220,0sleep2301ktimersoftd/222:21:552
16490992118,2cyclictest24352-21kworker/u8:221:43:051
67082200,0sleep20-21swapper/223:31:062
16492992017,2cyclictest32602-21diskmemload00:35:153
1649299200,2cyclictest0-21swapper/319:40:143
1649299200,18cyclictest0-21swapper/321:45:113
1648999200,2cyclictest0-21swapper/020:35:160
222832190,0sleep00-21swapper/023:48:030
1649099193,2cyclictest18151-21ssh23:44:041
16490991916,2cyclictest28905-21kworker/u8:119:47:041
16490991916,2cyclictest26258-21kworker/u8:219:34:011
1649199180,2cyclictest32602-21diskmemload22:39:052
1649099182,2cyclictest23-21ksoftirqd/100:04:051
16490991815,2cyclictest8759-21kworker/u8:220:16:051
16490991815,2cyclictest28905-21kworker/u8:120:04:011
16490991815,2cyclictest24129-21kworker/u8:222:21:041
16490991815,2cyclictest22200-21kworker/u8:119:26:041
16490991815,2cyclictest19337-21kworker/u8:100:24:051
16490991815,2cyclictest19337-21kworker/u8:100:24:051
16490991815,2cyclictest16367-21kworker/u8:019:22:041
16490991815,2cyclictest16367-21kworker/u8:019:17:041
16490991815,2cyclictest15312-21kworker/u8:022:33:041
16490991815,2cyclictest12158-21kworker/u8:223:32:041
16490991813,4cyclictest7376-21kworker/u8:122:28:051
16490991813,4cyclictest24352-21kworker/u8:222:01:041
272182170,0sleep10-21swapper/121:37:251
263962170,1sleep30-21swapper/323:51:593
229582170,1sleep30-21swapper/300:22:133
229582170,1sleep30-21swapper/300:22:133
1649299173,12cyclictest30512-21modprobe00:30:163
1649299173,12cyclictest30512-21modprobe00:30:163
16492991713,2cyclictest7046-21sh23:31:383
1649199172,9cyclictest16672-21ssh22:35:002
1649199172,2cyclictest4077-21ssh00:36:012
16491991714,2cyclictest25924-21kworker/u8:023:22:042
16491991712,3cyclictest0-21swapper/200:00:182
1649099172,2cyclictest0-21swapper/123:05:041
16490991714,2cyclictest6110-21kworker/u8:020:45:041
16490991714,2cyclictest6110-21kworker/u8:020:36:041
16490991714,2cyclictest28905-21kworker/u8:119:56:041
16490991714,2cyclictest28905-21kworker/u8:119:41:041
16490991714,2cyclictest24352-21kworker/u8:221:58:041
16490991714,2cyclictest24352-21kworker/u8:221:51:041
16490991714,2cyclictest24129-21kworker/u8:222:18:041
16490991714,2cyclictest18814-21kworker/u8:121:06:041
16490991714,2cyclictest1624-21kworker/u8:221:17:051
16490991714,2cyclictest14299-21kworker/u8:119:11:041
16490991714,2cyclictest14299-21kworker/u8:119:11:041
16490991714,2cyclictest11163-21kworker/u8:123:36:051
1649099170,2cyclictest0-21swapper/123:47:041
1649099170,2cyclictest0-21swapper/100:26:041
1649099170,12cyclictest0-21swapper/121:27:041
1648999171,14cyclictest1139-21apt-get21:45:060
16492991611,3cyclictest26484-21ls00:25:283
1649199161,3cyclictest30163-21apt-get22:15:162
16491991613,2cyclictest9099-21kworker/u8:200:14:042
1649199161,13cyclictest16091-21ssh22:00:132
1649199160,2cyclictest0-21swapper/221:31:042
16490991613,2cyclictest9099-21kworker/u8:200:37:051
16490991613,2cyclictest7376-21kworker/u8:122:36:051
16490991613,2cyclictest6110-21kworker/u8:020:31:041
16490991613,2cyclictest6110-21kworker/u8:020:24:041
16490991613,2cyclictest31296-21kworker/u8:123:24:041
16490991613,2cyclictest2921-21kworker/u8:100:12:041
16490991613,2cyclictest28905-21kworker/u8:119:50:051
16490991613,2cyclictest26258-21kworker/u8:219:39:041
16490991613,2cyclictest24352-21kworker/u8:221:46:041
16490991613,2cyclictest20739-21kworker/u8:222:41:041
16490991613,2cyclictest1900-21kworker/u8:122:53:041
16490991613,2cyclictest18814-21kworker/u8:120:59:041
16490991613,2cyclictest12799-21kworker/u8:120:28:011
1649099160,2cyclictest0-21swapper/122:45:041
1649099160,11cyclictest0-21swapper/122:05:051
1649299151,12cyclictest14147-21ssh21:57:503
1649299150,12cyclictest0-21swapper/323:14:093
1649199151,2cyclictest0-21swapper/222:07:042
16491991512,2cyclictest18814-21kworker/u8:120:47:042
16491991510,3cyclictest1139-21apt-get21:45:052
16491991510,3cyclictest0-21swapper/222:13:042
16491991510,3cyclictest0-21swapper/222:13:032
1649199150,2cyclictest0-21swapper/222:45:232
16490991512,2cyclictest6110-21kworker/u8:020:13:041
16490991512,2cyclictest28905-21kworker/u8:120:08:041
16490991512,2cyclictest28826-21kworker/u8:000:05:041
16490991512,2cyclictest18814-21kworker/u8:120:54:011
1649099150,7cyclictest0-21swapper/123:55:121
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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