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2026-08-19 - 06:32

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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Click here to display the system's profile data or here to proceed to next system.
Click on a legend element to toggle display of that core, ctrl-click inverts display, shift-click enables all.

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 Wed Aug 19, 2026 00:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2954729551,39sleep00-21swapper/019:09:590
2950129273,14sleep10-21swapper/119:09:231
2953328658,9sleep30-21swapper/319:09:503
2936128270,8sleep20-21swapper/219:07:362
174632440,0sleep20-21swapper/200:39:022
2962399251,7cyclictest13114-21ssh23:00:150
2963399240,23cyclictest0-21swapper/200:32:532
2963799236,16cyclictest10937-21kworker/u8:023:38:343
29637992310,12cyclictest32252-21apt-get19:15:143
2963799230,3cyclictest0-21swapper/300:10:153
2963799230,22cyclictest0-21swapper/300:38:043
29637992221,1cyclictest0-21swapper/322:05:153
2963799220,18cyclictest0-21swapper/321:52:553
2962899222,20cyclictest0-21swapper/123:15:341
2962899222,20cyclictest0-21swapper/123:15:331
29628992221,1cyclictest0-21swapper/100:38:041
2963799216,10cyclictest9707-21/usr/sbin/munin00:15:163
2962899210,16cyclictest0-21swapper/121:49:051
2962899210,16cyclictest0-21swapper/121:49:051
2962399212,3cyclictest141rcu_preempt22:43:120
2963399200,20cyclictest0-21swapper/223:11:252
2963399200,20cyclictest0-21swapper/222:56:382
2963399200,20cyclictest0-21swapper/221:51:312
29623992019,1cyclictest22212-21diskmemload23:46:290
29623992019,1cyclictest0-21swapper/020:55:140
29633991914,1cyclictest32-21ksoftirqd/223:54:422
2963399190,17cyclictest0-21swapper/222:17:412
29628991915,3cyclictest0-21swapper/121:36:281
29637991817,1cyclictest0-21swapper/322:10:373
2962899181,2cyclictest0-21swapper/122:52:041
2963799170,1cyclictest0-21swapper/323:49:213
2963799170,16cyclictest0-21swapper/322:38:093
2963399170,17cyclictest0-21swapper/222:09:162
2963399170,16cyclictest0-21swapper/221:22:362
29628991715,2cyclictest0-21swapper/123:32:341
2962899170,2cyclictest0-21swapper/120:15:151
2962899170,17cyclictest0-21swapper/100:07:491
2962399171,2cyclictest0-21swapper/021:27:080
29637991614,1cyclictest0-21swapper/322:25:353
2963799160,16cyclictest0-21swapper/322:15:193
2963399160,16cyclictest0-21swapper/200:12:152
2963399160,15cyclictest0-21swapper/223:39:192
2963399160,15cyclictest0-21swapper/223:16:372
2963399160,15cyclictest0-21swapper/223:16:372
2962899169,6cyclictest15374-21apache223:50:171
2962899162,1cyclictest0-21swapper/123:39:381
13132160,0chrt0-21swapper/100:29:311
2963799154,1cyclictest141rcu_preempt22:48:523
29637991514,1cyclictest0-21swapper/323:29:513
29637991511,4cyclictest0-21swapper/323:52:293
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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