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2026-03-31 - 22:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack7slot7s.osadl.org (updated Tue Mar 31, 2026 12:43:50)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1044021050,0sleep20-21swapper/211:16:592
3048229481,9sleep00-21swapper/007:07:530
2852128471,9sleep20-21swapper/207:05:112
2856028365,13sleep10-21swapper/107:05:131
3044928168,9sleep30-21swapper/307:07:293
3073599280,28cyclictest0-21swapper/209:16:592
3072999270,26cyclictest0-21swapper/011:34:400
3072999263,1cyclictest464-21apt-get09:35:020
3072999252,3cyclictest0-21swapper/012:29:540
3072999250,1cyclictest0-21swapper/010:35:140
3073999242,1cyclictest0-21swapper/311:50:363
3072999242,2cyclictest23533-21diskmemload11:57:410
3073399230,3cyclictest0-21swapper/111:30:171
3072999230,4cyclictest0-21swapper/011:11:480
3073599221,0cyclictest0-21swapper/210:40:142
3072999222,2cyclictest23533-21diskmemload09:53:070
3072999220,1cyclictest0-21swapper/011:17:440
3072999220,1cyclictest0-21swapper/010:18:140
263262220,2sleep226323-21apache_accesses12:25:122
30729992114,7cyclictest0-21swapper/012:31:450
3072999211,1cyclictest0-21swapper/010:10:120
3072999210,21cyclictest0-21swapper/010:04:300
3072999210,14cyclictest0-21swapper/010:30:130
3073999200,1cyclictest0-21swapper/309:20:143
3073399209,7cyclictest452-21systemd-logind08:00:221
3073399209,7cyclictest452-21systemd-logind08:00:221
3073399200,1cyclictest0-21swapper/112:00:461
3073399200,1cyclictest0-21swapper/111:11:371
3072999200,5cyclictest0-21swapper/012:10:130
3072999200,2cyclictest0-21swapper/012:04:400
3072999200,20cyclictest0-21swapper/009:24:150
3072999200,0cyclictest0-21swapper/012:22:400
3073599190,1cyclictest0-21swapper/210:39:452
3073399190,2cyclictest0-21swapper/111:53:221
3073399190,19cyclictest23533-21diskmemload09:54:221
3072999196,6cyclictest879-21perf07:15:000
3072999191,3cyclictest23533-21diskmemload10:27:410
3072999191,3cyclictest23533-21diskmemload09:17:290
3072999191,1cyclictest225-21systemd-journal09:14:590
3072999191,1cyclictest0-21swapper/010:49:140
3072999190,2cyclictest0-21swapper/012:15:050
3073999180,1cyclictest0-21swapper/310:09:583
3073599182,14cyclictest0-21swapper/210:06:092
30735991816,1cyclictest141rcu_preempt09:35:032
3073599180,0cyclictest0-21swapper/212:10:212
30733991818,0cyclictest0-21swapper/110:52:201
3072999188,5cyclictest11607-21ssh10:20:110
3072999187,7cyclictest5361-21taskset07:21:290
3072999183,2cyclictest23533-21diskmemload10:53:400
3072999181,3cyclictest10426-21/usr/sbin/munin12:35:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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