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2026-03-23 - 13:40

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 Mon Mar 23, 2026 00:44:14)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28967792880,2chrt75-21kworker/3:1+events20:41:393
31014882710,2sleep3481ktimers/300:06:403
2802675995545,7cyclictest2884127-21latency_hist20:30:011
29938972540,4chrt2993900-21cpuspeed_turbos22:21:320
2802675995243,6cyclictest3122897-21latency_hist00:30:011
2802673995243,7cyclictest3107588-21latency_hist00:15:010
28702202480,2chrt0-21swapper/020:16:360
2802675994840,6cyclictest1453398-21kworker/u8:3+flush-8:021:41:321
2802675994640,4cyclictest2869270-21latency_hist20:15:001
2802675994638,5cyclictest2993298-21latency_hist22:20:011
2802675994637,6cyclictest280-21systemd-journal21:30:131
2802673994638,6cyclictest2904324-21cat20:50:010
2802673994534,9cyclictest3047934-21apt-get23:15:010
30444022440,3sleep20-21swapper/223:11:382
2802678994336,5cyclictest280-21systemd-journal20:41:132
2802675994233,6cyclictest2802508-21latency_hist19:10:011
2802675994231,9cyclictest2888339-21ntpq20:31:461
29610442410,0chrt371rcuc/221:46:392
2802673994136,4cyclictest2914251-21kworker/u8:1+events_unbound21:35:000
2802675994035,3cyclictest2983079-21kworker/u8:0+flush-8:022:11:381
2802673994036,3cyclictest1453398-21kworker/u8:3+flush-8:021:16:450
2802675993931,6cyclictest3107589-21apt-get00:15:001
2802675993830,5cyclictest280-21systemd-journal22:57:491
2802673993834,3cyclictest1453398-21kworker/u8:3+flush-8:021:36:350
2802673993732,4cyclictest1453398-21kworker/u8:3+flush-8:020:06:470
2802673993732,4cyclictest1453398-21kworker/u8:3+flush-8:020:06:470
2802675993632,3cyclictest1453398-21kworker/u8:3+flush-8:020:06:341
2802675993632,3cyclictest1453398-21kworker/u8:3+flush-8:020:06:341
2802673993628,6cyclictest280-21systemd-journal23:20:010
280235823625,6sleep30-21swapper/319:08:143
2802678993529,4cyclictest2834297-21unixbench_multi19:36:492
2802675993529,4cyclictest3092778-21kworker/u8:3+events_unbound00:36:381
2802675993528,5cyclictest280-21systemd-journal20:17:131
2802678993425,7cyclictest2819814-21cron19:25:002
2802675993428,4cyclictest1-21systemd23:15:011
2802675993426,6cyclictest280-21systemd-journal19:15:031
2802673993429,3cyclictest3022976-21kworker/u8:3+flush-8:023:21:350
2802673993330,2cyclictest2854484-21latency_hist20:00:000
2802673993324,7cyclictest2992477-21ntpq22:16:430
2802678993226,4cyclictest2878873-21unixbench_singl20:21:502
2802675993228,3cyclictest2818942-21needreboot19:21:411
2802675993227,4cyclictest2837494-21kworker/u8:2+flush-8:020:56:351
2802675993227,4cyclictest2837494-21kworker/u8:2+flush-8:019:51:371
2802675993224,6cyclictest2849886-21apt-get19:56:291
2802675993224,6cyclictest1453398-21kworker/u8:3+flush-8:021:36:381
2802675993126,4cyclictest2879152-21cron20:25:001
2802675993125,4cyclictest3127551-21unixbench_multi00:31:511
2802675993125,4cyclictest2939833-21irqrtprio21:26:371
2802675993124,5cyclictest2906644-21kthreadcore20:51:391
2802673993122,6cyclictest3008114-21latency_hist22:35:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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