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2026-07-05 - 03:44

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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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 50 highest latencies:
System rack5slot4s.osadl.org (updated Sun Jul 05, 2026 00:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
214234721750,3sleep375-21kworker/3:1+events21:10:163
23054492890,1chrt2305453-21fschecks_count23:55:121
20766492850,3chrt75-21kworker/3:1+events20:05:103
20921662740,5chrt0-21swapper/320:20:153
2019302996864,3cyclictest2106335-21kworker/u8:2+events_unbound21:10:302
22360972620,2sleep375-21kworker/3:1+mm_percpu_wq22:45:143
20292592610,2sleep3451irq_work/319:15:183
20971132600,6sleep20-21swapper/220:25:152
2019294995747,8cyclictest2030077-21ntpq19:15:200
2019294995648,6cyclictest2175568-21latency_hist21:45:020
2019294995551,3cyclictest1963411-21kworker/u8:0+flush-8:019:25:250
2019297995344,6cyclictest2319772-21latency_hist00:10:001
2019294995347,4cyclictest2300195-21kworker/u8:0+flush-8:000:20:270
2019294995347,4cyclictest2300195-21kworker/u8:0+flush-8:000:20:270
2019294995342,8cyclictest2120041-21ntpq20:45:210
2019297995247,4cyclictest2195268-21kworker/u8:2+events_unbound00:25:261
2019297995246,4cyclictest2045806-21kworker/u8:1+events_unbound20:10:251
2019294995241,9cyclictest2274240-21ntpq23:20:220
2019297995141,8cyclictest2190430-21latency_hist22:00:011
2019294995146,4cyclictest674386-21kworker/u8:2+events_unbound20:05:140
2019294995145,4cyclictest674386-21kworker/u8:2+flush-8:019:45:120
2019294995142,6cyclictest2145733-21latency_hist21:15:000
2019297994944,4cyclictest2141264-21kworker/u8:3+flush-8:021:20:311
2019294994944,4cyclictest2045806-21kworker/u8:1+flush-8:021:00:310
2019294994943,4cyclictest2141264-21kworker/u8:3+flush-8:021:30:260
2019294994943,4cyclictest2141264-21kworker/u8:3+flush-8:021:30:250
2019294994938,9cyclictest2179566-21ntpq21:45:220
2019297994737,7cyclictest2205528-21latency_hist22:15:011
2019294994742,4cyclictest2081493-21kworker/u8:0+flush-8:020:50:120
2019294994741,5cyclictest2269573-21kworker/u8:3+events_unbound23:30:260
2019294994739,6cyclictest2323797-21ntpq00:10:220
2019297994636,8cyclictest2156200-21diskstats21:25:111
2019297994636,8cyclictest2156200-21diskstats21:25:111
2019294994635,9cyclictest2239300-21ntpq22:45:210
2019302994541,3cyclictest2229904-21kworker/u8:1+events_unbound23:10:132
2019294994536,7cyclictest2076336-21latency_hist20:05:000
2019302994439,4cyclictest2269573-21kworker/u8:3+events_unbound00:25:302
2019297994438,4cyclictest2170870-21apt-get21:40:081
2019297994437,5cyclictest1986896-21kworker/u8:1+flush-8:019:20:221
2019294994436,6cyclictest1704890-21systemd-journal19:15:000
2019297994333,8cyclictest1704890-21systemd-journal23:25:011
2019294994332,2cyclictest2141264-21kworker/u8:3+flush-8:022:05:250
2019302994238,3cyclictest2195268-21kworker/u8:2+events_unbound22:40:312
2019297994234,6cyclictest1704890-21systemd-journal20:39:411
2019294994236,4cyclictest2141264-21kworker/u8:3+flush-8:022:30:220
2019297994137,3cyclictest2081493-21kworker/u8:0+flush-8:020:25:231
2019297994136,3cyclictest674386-21kworker/u8:2+flush-8:019:55:171
2019294994135,5cyclictest2195268-21kworker/u8:2+flush-8:022:50:370
2019302994033,5cyclictest1704890-21systemd-journal22:25:012
2019294994035,4cyclictest2081493-21kworker/u8:0+events_unbound20:40:260
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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