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2026-09-11 - 09:20

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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 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 100 highest latencies:
System rackeslot5s.osadl.org (updated Fri Sep 11, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2006299290,28cyclictest0-21swapper/023:46:590
2006299280,27cyclictest6646-21latency_hist23:30:000
2006299280,24cyclictest13664-21diskmemload23:37:290
20062992623,3cyclictest0-21swapper/000:07:130
20062992621,4cyclictest12076-21apt-get22:07:000
2006299260,26cyclictest0-21swapper/022:42:020
2006999250,24cyclictest1299-21ntp_states21:27:063
2006999250,24cyclictest1299-21ntp_states21:27:063
2006799252,2cyclictest2195-21sh22:56:572
20067992521,4cyclictest0-21swapper/223:54:582
2006799250,24cyclictest0-21swapper/221:36:262
2006699250,24cyclictest29079-21ssh22:51:531
20062992523,1cyclictest16312-21expr00:37:010
20062992522,3cyclictest13664-21diskmemload21:49:430
20062992520,4cyclictest13664-21diskmemload21:26:340
20062992520,4cyclictest13664-21diskmemload21:26:340
2006299250,24cyclictest26553-21ssh22:48:400
2006299250,24cyclictest0-21swapper/022:52:080
2006299250,24cyclictest0-21swapper/021:56:100
2006299250,23cyclictest0-21swapper/000:28:030
20069992422,1cyclictest13664-21diskmemload00:04:563
2006999240,2cyclictest30795-21ssh22:22:363
2006999240,23cyclictest13664-21diskmemload22:55:123
2006999240,23cyclictest0-21swapper/323:49:223
2006999240,23cyclictest0-21swapper/322:28:293
2006999240,23cyclictest0-21swapper/321:53:593
2006999240,1cyclictest13664-21diskmemload21:40:373
2006999240,0cyclictest4491-21apt-get20:51:593
20067992423,1cyclictest0-21swapper/221:16:012
2006799242,21cyclictest13664-21diskmemload22:44:402
2006799240,24cyclictest0-21swapper/223:59:552
20066992421,2cyclictest31996-21grep00:22:001
2006699240,24cyclictest0-21swapper/123:42:291
2006699240,24cyclictest0-21swapper/100:01:531
2006699240,23cyclictest0-21swapper/123:16:581
2006699240,0cyclictest0-21swapper/121:18:351
20062992421,3cyclictest0-21swapper/021:22:070
20062992421,2cyclictest3317-21sh22:27:080
20062992421,2cyclictest26278-21ssh22:19:070
2006299240,24cyclictest9936-21ssh00:31:270
2006299240,23cyclictest13664-21diskmemload22:36:340
2006299240,23cyclictest13664-21diskmemload21:14:590
2006299240,23cyclictest0-21swapper/023:18:120
2006299240,23cyclictest0-21swapper/023:06:430
20069992323,0cyclictest13664-21diskmemload22:07:263
20069992323,0cyclictest0-21swapper/323:10:363
20069992323,0cyclictest0-21swapper/323:06:013
20069992323,0cyclictest0-21swapper/322:35:133
20069992323,0cyclictest0-21swapper/321:10:343
20069992323,0cyclictest0-21swapper/319:51:573
20069992321,1cyclictest16484-21cron20:10:013
20069992321,1cyclictest0-21swapper/323:55:243
20069992321,1cyclictest0-21swapper/300:27:003
20069992320,2cyclictest31219-21ssh00:21:383
20069992320,2cyclictest23172-21sh00:13:193
20069992320,2cyclictest10214-21ssh22:33:573
2006999230,23cyclictest0-21swapper/321:15:243
2006999230,1cyclictest0-21swapper/319:46:583
2006999230,0cyclictest13664-21diskmemload21:55:133
2006999230,0cyclictest0-21swapper/323:53:223
20067992323,0cyclictest0-21swapper/222:51:242
20067992323,0cyclictest0-21swapper/222:45:582
20067992322,1cyclictest13664-21diskmemload23:35:362
20067992321,1cyclictest21341-21ssh21:45:242
20067992320,2cyclictest9548-21ssh22:03:522
2006799230,23cyclictest13664-21diskmemload21:12:232
2006799230,22cyclictest834-21ssh22:25:512
2006799230,22cyclictest7552-21sh23:01:422
2006799230,22cyclictest606-21dbus-daemon21:00:012
2006799230,22cyclictest29551-21apt-get23:21:572
2006799230,22cyclictest2931-21sh21:28:302
2006799230,22cyclictest2931-21sh21:28:302
2006799230,22cyclictest26645-21ssh21:50:092
2006799230,22cyclictest26530-21ssh23:17:572
2006799230,22cyclictest2545-21ssh23:26:532
2006799230,22cyclictest17333-21ssh23:10:142
2006799230,22cyclictest13664-21diskmemload22:11:062
2006799230,22cyclictest0-21swapper/223:46:582
2006799230,22cyclictest0-21swapper/200:29:462
2006799230,0cyclictest13664-21diskmemload21:58:472
2006799230,0cyclictest13664-21diskmemload00:05:402
2006799230,0cyclictest0-21swapper/221:30:102
2006799230,0cyclictest0-21swapper/221:20:202
2006799230,0cyclictest0-21swapper/200:15:362
20066992323,0cyclictest0-21swapper/122:56:071
20066992323,0cyclictest0-21swapper/122:31:431
20066992323,0cyclictest0-21swapper/122:25:111
20066992323,0cyclictest0-21swapper/122:11:431
20066992323,0cyclictest0-21swapper/100:36:281
20066992322,1cyclictest13664-21diskmemload21:42:071
20066992322,1cyclictest0-21swapper/121:45:111
20066992321,1cyclictest18495-21sh23:11:581
20066992321,1cyclictest0-21swapper/100:09:261
2006699230,2cyclictest4636-21ssh21:30:041
2006699230,23cyclictest13664-21diskmemload21:58:461
2006699230,23cyclictest0-21swapper/123:23:291
2006699230,22cyclictest8181-21df_inode23:02:021
2006699230,22cyclictest7098-21ssh23:30:311
2006699230,22cyclictest27287-21rm21:50:581
2006699230,22cyclictest21873-21ssh22:15:221
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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