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2026-05-12 - 06:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #1, 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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  Intel
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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 rack1slot6s.osadl.org (updated Tue May 12, 2026 00:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
864921200,4sleep28650-21gzip20:49:372
2485991080,3rtkit-daemon0-21swapper/021:13:030
2958199973,77cyclictest0-21swapper/021:54:270
2958199953,25cyclictest0-21swapper/020:16:590
2958199945,26cyclictest0-21swapper/019:50:200
2958199944,25cyclictest0-21swapper/021:18:240
2958199943,32cyclictest0-21swapper/019:35:410
2958199937,18cyclictest121850irq/46-eth019:27:250
2958199934,24cyclictest0-21swapper/021:52:210
2958199934,13cyclictest0-21swapper/020:29:070
2958199933,23cyclictest5578-21ssh19:09:380
29581999318,12cyclictest0-21swapper/018:20:490
29581999317,11cyclictest0-21swapper/019:42:520
2958199924,69cyclictest0-21swapper/021:46:040
2958199924,28cyclictest0-21swapper/018:24:300
2958199924,27cyclictest0-21swapper/022:02:400
2958199924,27cyclictest0-21swapper/020:01:530
2958199924,27cyclictest0-21swapper/020:01:530
2958199924,26cyclictest0-21swapper/020:41:130
2958199924,25cyclictest0-21swapper/019:31:120
2958199924,24cyclictest0-21swapper/021:33:410
2958199923,26cyclictest0-21swapper/019:14:250
2958199923,22cyclictest1287-21snmpd20:24:040
29581999218,12cyclictest0-21swapper/018:44:440
2958199915,26cyclictest0-21swapper/022:04:410
2958199915,26cyclictest0-21swapper/022:04:410
2958199915,25cyclictest0-21swapper/020:29:310
2958199915,25cyclictest0-21swapper/018:58:590
2958199914,27cyclictest0-21swapper/017:49:370
2958199914,25cyclictest0-21swapper/021:08:530
2958199914,25cyclictest0-21swapper/020:52:070
2958199914,25cyclictest0-21swapper/020:08:480
2958199914,24cyclictest3815-21munin-node20:44:270
2958199914,24cyclictest3815-21munin-node20:44:270
2958199914,23cyclictest0-21swapper/021:24:280
2958199914,23cyclictest0-21swapper/021:24:280
29581999118,9cyclictest30875-21ssh18:59:400
2958199904,25cyclictest0-21swapper/020:55:110
2958199904,24cyclictest0-21swapper/022:13:350
29581999019,12cyclictest0-21swapper/019:54:320
29581999017,11cyclictest0-21swapper/019:48:370
2958199898,23cyclictest0-21swapper/019:04:440
2958199894,26cyclictest0-21swapper/018:35:520
2958199894,24cyclictest0-21swapper/020:35:290
2958199893,27cyclictest0-21swapper/018:49:280
2958199893,19cyclictest223311diskmemload19:19:190
2958199893,19cyclictest223311diskmemload19:19:190
2958199885,24cyclictest0-21swapper/021:00:110
2958199884,77cyclictest0-21swapper/020:09:340
2958199884,26cyclictest0-21swapper/017:14:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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