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2026-07-18 - 08:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #4

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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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.

Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Sat Jul 18, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
110596323080,4sleep3481ktimers/322:37:283
898791996454,7cyclictest1010065-21latency_hist21:00:011
9884252610,3sleep2371rcuc/220:37:312
898791995948,9cyclictest984855-21apt-get20:35:001
898791995649,5cyclictest1055163-21kworker/u8:0+flush-8:022:47:401
898791995546,6cyclictest281-21systemd-journal00:10:001
898791995542,10cyclictest281-21systemd-journal22:27:401
898791995445,7cyclictest1019976-21kworker/u8:2+flush-8:021:47:401
898791995344,7cyclictest1219235-21/usr/sbin/munin00:32:381
898786995344,6cyclictest1085021-21latency_hist22:15:010
9691942520,2sleep2371rcuc/220:17:332
898791995246,4cyclictest1125037-21kworker/u8:2+flush-8:023:47:401
898791995145,4cyclictest960099-21kworker/u8:1+flush-8:021:22:401
898786995041,7cyclictest974949-21latency_hist20:25:010
10708022490,5sleep3451irq_work/322:02:263
898791994843,3cyclictest852113-21kworker/u8:1+flush-8:019:42:261
898791994839,6cyclictest1039743-21latency_hist21:30:011
898791994838,7cyclictest920468-21latency_hist19:30:001
898786994735,9cyclictest1153697-21ntpq23:22:340
898791994640,4cyclictest1000169-21latency_hist20:50:001
898791994635,8cyclictest1029882-21latency_hist21:20:011
89878699467,37cyclictest608-21sshd19:52:390
898786994635,9cyclictest1000571-21/usr/sbin/munin20:52:400
10814402460,2chrt584-21kworker/3:2-events22:12:293
898796994538,5cyclictest1099844-21apt-get22:30:002
898791994541,3cyclictest1055163-21kworker/u8:0+flush-8:023:32:281
898791994536,7cyclictest281-21systemd-journal20:55:001
898791994536,7cyclictest1144774-21kworker/u8:1+flush-8:023:27:371
898786994538,5cyclictest1020386-21apt-get21:12:230
898786994515,13cyclictest585-21runrttasks00:22:240
898786994515,13cyclictest585-21runrttasks00:22:240
898786994435,6cyclictest1189134-21latency_hist00:00:010
898791994339,3cyclictest1055163-21kworker/u8:0+flush-8:023:22:381
898791994338,4cyclictest1144774-21kworker/u8:1+flush-8:023:17:281
898791994333,7cyclictest281-21systemd-journal22:37:401
898791994237,3cyclictest1054854-21latency_hist21:45:011
898791994235,4cyclictest1055163-21kworker/u8:0+events_unbound22:07:401
898791994234,6cyclictest281-21systemd-journal22:30:011
898791994233,7cyclictest1040148-21/usr/sbin/munin21:32:351
898786994234,6cyclictest1139636-21latency_hist23:10:000
898786994211,18cyclictest585-21runrttasks23:42:360
898791994136,3cyclictest960099-21kworker/u8:1+flush-8:021:12:401
898791994033,5cyclictest975384-21apt-get20:27:221
898791994033,5cyclictest852113-21kworker/u8:1+flush-8:019:37:411
898791994033,5cyclictest852113-21kworker/u8:1+flush-8:019:37:411
898791994030,7cyclictest1114183-21ntpq22:42:341
898796993933,4cyclictest1055163-21kworker/u8:0+flush-8:023:37:442
898791993930,6cyclictest915528-21kworker/u8:0+flush-8:019:47:401
898791993929,8cyclictest914846-21ntpq19:22:421
898786993928,9cyclictest950891-21diskstats20:02:280
898791993833,4cyclictest960099-21kworker/u8:1+flush-8:021:07:401
898791993832,4cyclictest960099-21kworker/u8:1+flush-8:020:42:401
898791993828,7cyclictest960083-21latency_hist20:10:011
898786993827,8cyclictest1030573-21diskstats21:22:270
898791993728,7cyclictest1213166-21ntpq00:22:371
898791993728,7cyclictest1213166-21ntpq00:22:371
898786993727,8cyclictest1203272-21ntpq00:12:370
898786993726,9cyclictest939587-21ntpq19:47:350
8941542378,22sleep10-21swapper/119:07:231
898791993632,3cyclictest852113-21kworker/u8:1+flush-8:019:17:381
898791993629,5cyclictest1055163-21kworker/u8:0+events_unbound23:57:261
898791993628,6cyclictest1065074-21cp21:55:001
898786993627,6cyclictest281-21systemd-journal21:07:400
898786993611,13cyclictest585-21runrttasks21:57:240
898786993611,13cyclictest585-21runrttasks21:57:240
898791993528,5cyclictest899111-21apt-get19:12:211
898786993511,12cyclictest585-21runrttasks22:42:220
898791993429,4cyclictest1169356-21kworker/u8:3+flush-8:023:42:411
898791993428,4cyclictest1218597-21grep00:27:421
898791993428,4cyclictest1124811-21latency_hist22:55:011
898791993427,5cyclictest970426-21apt-get20:22:231
898791993426,6cyclictest960099-21kworker/u8:1+flush-8:022:02:291
898791993426,5cyclictest965067-21latency_hist20:15:011
898791993425,7cyclictest1133944-21ntpq23:02:361
898786993411,11cyclictest585-21runrttasks00:07:400
898791993327,5cyclictest1055163-21kworker/u8:0+flush-8:023:52:361
898791993326,5cyclictest935576-21kworker/u8:3+flush-8:020:02:321
898791993324,6cyclictest281-21systemd-journal20:18:411
89878699339,11cyclictest979369-21python320:27:410
89878699339,10cyclictest1050649-21uniq21:42:260
89878699338,14cyclictest1029157-21ntpq21:17:380
89878699337,15cyclictest1218100-21ntpq00:27:350
89878699337,14cyclictest585-21runrttasks21:27:230
89878699335,18cyclictest924735-21ntpq19:32:380
89878699334,15cyclictest1093952-21wc22:22:320
898786993323,7cyclictest1079298-21ntpq22:07:370
89855323325,3sleep00-21swapper/019:09:190
8941172334,9sleep20-21swapper/219:07:162
898791993227,3cyclictest942909-21kthreadcore19:52:321
89878699328,13cyclictest1189973-21/usr/sbin/munin00:02:270
89878699328,12cyclictest1043926-21ntpq21:32:370
89878699327,14cyclictest964326-21ntpq20:12:360
89878699327,10cyclictest1184169-21munin-run23:55:000
89878699326,16cyclictest1049259-21/usr/sbin/munin21:37:400
89878699326,15cyclictest984158-21ntpq20:32:380
89878699325,10cyclictest10747521timerandwakeup22:02:420
89878699324,18cyclictest1-21systemd23:40:010
89878699324,17cyclictest1163617-21ld23:32:370
89878699322,17cyclictest0-21swapper/020:45:030
898786993214,6cyclictest1132451-21kthreadcore23:02:330
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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