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2026-05-15 - 02:46

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 Fri May 15, 2026 00:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
109762118106,6sleep30-21swapper/319:09:533
10933211593,16sleep00-21swapper/019:09:190
10829211496,12sleep10-21swapper/119:08:001
10851210594,6sleep20-21swapper/219:08:172
7902750,0sleep20-21swapper/220:05:002
272382750,1sleep337-21rcuc/323:31:293
56772700,0sleep30-21swapper/321:21:533
36112700,0sleep00-21swapper/021:20:140
11016993833,1cyclictest0-21swapper/222:55:122
1101499240,2cyclictest0-21swapper/022:25:060
281712220,0sleep00-21swapper/021:47:070
1101499220,3cyclictest4467-21ssh22:31:270
1101499220,3cyclictest13905-21ssh22:06:190
1101499220,3cyclictest10264-21ssh23:48:590
1101499220,3cyclictest0-21swapper/023:32:150
1101499220,2cyclictest0-21swapper/020:15:190
1101499220,12cyclictest0-21swapper/022:49:500
1101699210,19cyclictest0-21swapper/221:45:122
1101699210,19cyclictest0-21swapper/219:40:122
1101499219,10cyclictest24250-21sh23:29:060
1101499211,18cyclictest25944-21diskmemload23:16:010
11014992110,9cyclictest6494-21expr00:20:130
1101499210,3cyclictest4151-21ssh23:06:310
1101499210,3cyclictest27873-21ssh22:57:310
1101499210,3cyclictest0-21swapper/023:24:030
1101499210,3cyclictest0-21swapper/022:35:580
1101499210,3cyclictest0-21swapper/021:55:430
1101499210,2cyclictest0-21swapper/023:51:540
1101499210,2cyclictest0-21swapper/023:36:160
1101499210,2cyclictest0-21swapper/023:03:420
1101499210,2cyclictest0-21swapper/022:51:020
1101499210,2cyclictest0-21swapper/022:44:470
1101499210,2cyclictest0-21swapper/021:31:550
1101499210,2cyclictest0-21swapper/000:16:340
136142200,1sleep229-21rcuc/222:41:222
1101799200,16cyclictest0-21swapper/322:49:543
1101699200,18cyclictest0-21swapper/221:05:112
1101499200,3cyclictest28700-21unixbench_multi19:51:030
1101499200,2cyclictest25944-21diskmemload23:55:470
1101499200,2cyclictest23898-21smartctl19:40:150
1101499200,2cyclictest0-21swapper/023:41:580
1101499200,2cyclictest0-21swapper/023:12:470
1101499200,2cyclictest0-21swapper/022:23:510
1101499200,2cyclictest0-21swapper/022:15:590
1101499200,2cyclictest0-21swapper/022:10:170
1101499200,2cyclictest0-21swapper/022:02:580
1101499200,2cyclictest0-21swapper/021:50:190
1101499200,2cyclictest0-21swapper/021:40:110
1101499200,2cyclictest0-21swapper/021:35:180
1101499200,2cyclictest0-21swapper/021:27:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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