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2025-06-12 - 14:53

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 12, 2025 12:43:32)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2469621500,11sleep23238999cyclictest11:05:142
32389999820,13cyclictest0-21swapper/207:55:082
3238999974,27cyclictest0-21swapper/207:00:202
3238999934,13cyclictest0-21swapper/209:05:082
3238999924,28cyclictest0-21swapper/210:30:042
3238999913,27cyclictest0-21swapper/209:19:472
3238999909,22cyclictest18041-21iostat_ios09:45:072
32389998931,50cyclictest0-21swapper/210:10:132
3238999875,16cyclictest0-21swapper/208:48:082
3238999874,28cyclictest0-21swapper/212:09:522
3238999874,28cyclictest0-21swapper/212:09:522
3238999874,28cyclictest0-21swapper/210:25:002
3238999874,27cyclictest0-21swapper/212:15:012
3238099873,77cyclictest28746-21latency_hist07:54:490
3238099873,77cyclictest28746-21latency_hist07:54:490
3238099872,75cyclictest17217-21find08:35:180
3238099872,75cyclictest17217-21find08:35:180
223099870,4rtkit-daemon2229-21rtkit-daemon11:48:013
3238999854,27cyclictest0-21swapper/210:00:192
3238999854,27cyclictest0-21swapper/210:00:192
3238999854,13cyclictest0-21swapper/209:30:102
3238099856,71cyclictest0-21swapper/007:05:150
3238099854,74cyclictest0-21swapper/009:35:130
3238099854,64cyclictest0-21swapper/008:04:490
3238099853,67cyclictest0-21swapper/007:40:150
32380998516,53cyclictest14380-21crond11:54:390
3238999843,28cyclictest1747-21cpuspeed_turbos10:20:012
32389998420,13cyclictest0-21swapper/207:40:102
3238999834,28cyclictest0-21swapper/209:55:112
3238099834,58cyclictest0-21swapper/007:10:120
3238099834,52cyclictest28352-21sort09:00:050
3238099833,59cyclictest0-21swapper/011:39:530
3238999827,12cyclictest0-21swapper/206:55:152
3238999824,29cyclictest13317-21grep08:29:482
3238999823,13cyclictest0-21swapper/209:25:002
32389998225,14cyclictest0-21swapper/209:20:132
32389998223,11cyclictest8831-21proc_pri07:10:192
32389998223,11cyclictest0-21swapper/207:05:252
32389998221,12cyclictest28391-21unixbench_singl10:05:172
32389998216,12cyclictest0-21swapper/208:40:142
3238099824,70cyclictest0-21swapper/009:20:180
3238099824,58cyclictest0-21swapper/010:48:180
3238099824,58cyclictest0-21swapper/010:48:180
3238999814,31cyclictest1160-21snmpd07:30:242
3238999814,11cyclictest0-21swapper/208:13:022
3238999813,26cyclictest0-21swapper/210:45:122
3238999813,26cyclictest0-21swapper/210:45:122
3238999813,25cyclictest0-21swapper/209:54:442
32389998121,12cyclictest0-21swapper/211:50:082
3238099814,70cyclictest0-21swapper/009:34:460
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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