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2026-05-05 - 06:52

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 05, 2026 00:43:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2485991120,5rtkit-daemon2484-21rtkit-daemon21:30:390
296789910326,70cyclictest20272-21gltestperf20:26:011
296789910321,29cyclictest32140-21fschecks_count19:56:021
2967899943,44cyclictest0-21swapper/121:11:101
2968199924,68cyclictest0-21swapper/218:41:112
39342910,8sleep32346-21munin-node17:06:243
29678999133,7cyclictest4858-21rm21:39:331
2968199884,67cyclictest0-21swapper/221:16:082
2968199884,65cyclictest0-21swapper/221:00:562
2968199884,65cyclictest0-21swapper/221:00:562
2968199884,65cyclictest0-21swapper/219:11:222
2968199884,65cyclictest0-21swapper/219:01:032
2968199884,65cyclictest0-21swapper/219:01:032
2968199884,61cyclictest29006-21sed19:51:052
2968199883,77cyclictest0-21swapper/221:10:232
2968199875,62cyclictest0-21swapper/221:25:412
2968199875,61cyclictest0-21swapper/221:46:042
2968199874,74cyclictest0-21swapper/220:33:392
2968199874,65cyclictest0-21swapper/221:55:512
2968199874,62cyclictest0-21swapper/220:58:202
2968199874,47cyclictest715-21kworker/2:219:20:472
2968199873,77cyclictest12719-21chrt20:15:552
2968199864,63cyclictest0-21swapper/219:06:032
2968199862,65cyclictest0-21swapper/220:04:492
2968199854,74cyclictest0-21swapper/219:48:122
2968199854,65cyclictest0-21swapper/218:21:102
2968199854,65cyclictest0-21swapper/218:21:102
2968199854,63cyclictest0-21swapper/218:36:022
2968199854,62cyclictest0-21swapper/222:16:232
2968199854,62cyclictest0-21swapper/220:12:492
2968199854,56cyclictest0-21swapper/221:13:162
2968199853,65cyclictest20505-21yum-updatesd-he17:41:232
2968199844,73cyclictest0-21swapper/220:06:082
2968199844,73cyclictest0-21swapper/219:31:352
2968199844,72cyclictest5340-21ssh20:51:122
2968199844,71cyclictest1287-21snmpd20:49:132
2968199844,59cyclictest0-21swapper/222:01:022
2968199844,58cyclictest0-21swapper/216:56:122
2968199843,74cyclictest22426-21diskmemload20:27:212
2968199843,74cyclictest0-21swapper/218:11:222
2968199843,65cyclictest31689-21fschecks_time21:30:592
2968199843,64cyclictest0-21swapper/221:55:262
2968199843,62cyclictest0-21swapper/219:28:242
2968199842,74cyclictest32474-21munin-node22:20:562
2968199842,74cyclictest32474-21munin-node22:20:562
29681998412,63cyclictest0-21swapper/219:56:132
2968199834,72cyclictest0-21swapper/221:41:132
2968199834,72cyclictest0-21swapper/221:41:132
2968199834,72cyclictest0-21swapper/220:21:132
2968199834,72cyclictest0-21swapper/217:46:042
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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