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2025-11-16 - 00:01

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 Sat Nov 15, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1375699903,80cyclictest0-21swapper/109:15:191
285072890,2sleep041ktimersoftd/012:05:290
1375699874,62cyclictest0-21swapper/109:48:421
1375699865,75cyclictest0-21swapper/107:50:211
1375699864,62cyclictest20465-21chrt08:25:381
1375699855,60cyclictest0-21swapper/111:55:331
1375699845,51cyclictest6165-21taskset11:17:151
1375699844,59cyclictest0-21swapper/107:30:441
1375699834,72cyclictest0-21swapper/111:10:141
1375699825,71cyclictest0-21swapper/109:05:191
1375699825,58cyclictest0-21swapper/107:23:191
1375699815,45cyclictest0-21swapper/112:10:421
1375699815,45cyclictest0-21swapper/112:10:421
1375699814,70cyclictest0-21swapper/109:55:171
1375699814,42cyclictest0-21swapper/111:50:401
1375699813,9cyclictest0-21swapper/108:25:201
13752998132,42cyclictest14423-21grep10:25:500
1375699805,68cyclictest0-21swapper/108:40:391
1375699805,68cyclictest0-21swapper/108:40:391
1375699805,55cyclictest0-21swapper/109:41:051
1375699804,69cyclictest0-21swapper/112:30:341
1375699804,10cyclictest0-21swapper/109:57:191
1375699803,8cyclictest12378-21if_eth011:30:371
1375299805,68cyclictest4409-21gzip12:20:410
13752998032,42cyclictest1194-21sed07:45:390
1375699794,56cyclictest0-21swapper/107:45:221
13756997938,32cyclictest27275-21tr10:55:321
13756997927,43cyclictest24257-21fschecks_time07:25:421
1375299794,69cyclictest0-21swapper/010:35:150
13752997922,39cyclictest0-21swapper/007:15:230
13752997922,39cyclictest0-21swapper/007:15:230
1375699785,66cyclictest0-21swapper/107:40:231
1375699785,65cyclictest32133-21cpuspeed_turbos08:50:351
1375699784,7cyclictest1369-21runrttasks10:49:581
1375699784,7cyclictest1369-21runrttasks10:49:581
1375699784,67cyclictest0-21swapper/108:15:481
1375699784,66cyclictest0-21swapper/111:00:481
13752997833,39cyclictest6585-21uname07:55:440
13752997832,40cyclictest32089-21tr11:05:300
1375699774,66cyclictest0-21swapper/108:40:211
1375699774,65cyclictest0-21swapper/107:55:221
13756997730,41cyclictest13490-21gltestperf10:25:361
1375699773,9cyclictest20867-21sshd07:20:101
1375699773,7cyclictest4025-21iostat_ios12:20:341
1375699773,56cyclictest13746-21cat09:20:191
1375699773,10cyclictest0-21swapper/112:05:341
1375299774,66cyclictest0-21swapper/008:35:400
1375699768,46cyclictest114550irq/46-eth011:35:431
1375699765,65cyclictest0-21swapper/110:10:291
1375699765,53cyclictest0-21swapper/110:40:501
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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