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2026-06-18 - 09:10

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 Thu Jun 18, 2026 00:43:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
27104999541,12cyclictest0-21swapper/122:06:351
27104999338,13cyclictest0-21swapper/119:01:251
2710199933,83cyclictest0-21swapper/021:42:510
2710199924,82cyclictest0-21swapper/021:36:340
2710199914,68cyclictest0-21swapper/021:51:230
2710199913,81cyclictest0-21swapper/023:06:150
2710799903,32cyclictest0-21swapper/321:11:273
2710199903,80cyclictest0-21swapper/023:52:360
2710199903,80cyclictest0-21swapper/022:51:280
27107998938,44cyclictest1636-21df22:46:193
2710199894,78cyclictest0-21swapper/022:27:130
2710199894,76cyclictest0-21swapper/023:21:120
2710199894,76cyclictest0-21swapper/023:21:120
2710199893,76cyclictest0-21swapper/000:19:530
27107998832,49cyclictest0-21swapper/323:26:213
2710199884,77cyclictest1227-21runrttasks21:47:160
2710199884,76cyclictest0-21swapper/000:01:580
2710199884,76cyclictest0-21swapper/000:01:580
2710199884,67cyclictest0-21swapper/022:01:320
2710199884,63cyclictest0-21swapper/023:16:130
2710199883,77cyclictest0-21swapper/022:39:280
2710199883,77cyclictest0-21swapper/022:39:280
2710199883,68cyclictest11556-21aten2.4-expect23:01:140
2710199883,64cyclictest0-21swapper/021:01:280
2710799873,76cyclictest858-21cut19:01:383
2710799873,37cyclictest3666-21cut23:36:213
2710199874,76cyclictest0-21swapper/000:10:050
2710199874,75cyclictest0-21swapper/021:20:150
2710199874,75cyclictest0-21swapper/021:20:150
2710199874,65cyclictest0-21swapper/019:51:290
2710199874,65cyclictest0-21swapper/000:11:110
2710199873,69cyclictest0-21swapper/022:41:210
2710199873,69cyclictest0-21swapper/022:41:210
2710799863,75cyclictest0-21swapper/321:26:253
2710799863,28cyclictest0-21swapper/320:51:093
27107998628,50cyclictest0-21swapper/322:56:333
27107998610,12cyclictest0-21swapper/300:12:103
2710199864,76cyclictest0-21swapper/022:16:050
2710199864,75cyclictest0-21swapper/023:56:160
2710199864,75cyclictest0-21swapper/023:56:160
2710199864,75cyclictest0-21swapper/022:46:290
2710199864,74cyclictest0-21swapper/022:23:040
2710199864,74cyclictest0-21swapper/020:46:360
2710799858,20cyclictest0-21swapper/321:10:033
2710199854,74cyclictest13095-21strings21:26:300
2710199854,74cyclictest0-21swapper/022:34:550
2710199854,74cyclictest0-21swapper/021:12:350
2710199854,74cyclictest0-21swapper/020:51:240
2710199854,67cyclictest0-21swapper/021:56:160
2710199854,67cyclictest0-21swapper/021:56:160
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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