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2026-09-03 - 23:27

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 Thu Sep 03, 2026 12:44:16)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
227262522270,2sleep3481ktimers/309:25:003
220823321790,2sleep3575-21kworker/3:2-events08:22:283
235303521390,22sleep3451irq_work/310:47:313
2136251996252,7cyclictest2292422-21latency_hist09:45:010
2136255995748,6cyclictest2362093-21latency_hist10:55:011
2136251995747,7cyclictest275-21systemd-journal11:04:590
2136251995445,6cyclictest2157931-21latency_hist07:30:010
2136251995041,6cyclictest2312628-21latency_hist10:05:000
2136251994940,6cyclictest2381868-21latency_hist11:15:010
2136255994841,5cyclictest2461575-21latency_hist12:35:001
2136251994842,4cyclictest2342577-21kworker/u8:1+events_unbound10:40:010
2136255994738,6cyclictest2232651-21latency_hist08:45:001
2136251994739,6cyclictest2317562-21latency_hist10:10:010
2136255994537,5cyclictest2446453-21latency_hist12:20:011
2136255994536,7cyclictest275-21systemd-journal08:32:341
2136251994535,7cyclictest275-21systemd-journal09:35:000
2136255994435,6cyclictest2411831-21latency_hist11:45:011
2136255994426,16cyclictest2336554-21needreboot10:27:381
2136259994336,5cyclictest275-21systemd-journal12:10:002
2136255994336,5cyclictest2094097-21kworker/u8:0+flush-8:007:22:391
2136255994323,18cyclictest20823-21cron11:30:001
2136255994125,14cyclictest2202762-21systemd-run08:15:011
2136255994124,15cyclictest275-21systemd-journal11:39:491
2136255994123,16cyclictest2159289-21kthreadcore07:32:351
2136255994023,5cyclictest275-21systemd-journal10:10:501
2136255994022,17cyclictest2347950-21cpuspeed_turbos10:42:291
2136255993917,7cyclictest2431997-21/usr/sbin/munin12:07:451
2136255993831,5cyclictest2437002-21apt-get12:12:261
2136255993818,5cyclictest0-21swapper/107:47:351
2136251993833,3cyclictest1-21systemd12:38:490
2136251993833,3cyclictest1-21systemd12:38:490
2136251993831,5cyclictest275-21systemd-journal10:34:500
213625199381,35cyclictest1-21systemd10:19:500
213625199381,35cyclictest1-21systemd10:19:500
21360962384,11sleep10-21swapper/107:09:591
21321302384,9sleep20-21swapper/207:07:362
2136255993717,5cyclictest275-21systemd-journal07:38:481
2136251993730,4cyclictest2141184-21kworker/u8:1+flush-8:007:22:280
2136251993729,5cyclictest2426634-21latency_hist12:00:010
2136251993729,5cyclictest2212614-21latency_hist08:25:000
2136251993630,4cyclictest275-21systemd-journal07:12:140
2136255993531,3cyclictest275-21systemd-journal09:10:001
2136255993529,4cyclictest2412262-21apt-get11:47:251
2136255993521,7cyclictest2258226-21apt-get09:12:281
2136251993528,5cyclictest2317787-21kworker/u8:3+flush-8:011:17:390
2136251993527,5cyclictest2193071-21kworker/u8:1+events_unbound08:20:010
2136251993526,7cyclictest275-21systemd-journal07:35:000
2136251993525,4cyclictest0-21swapper/010:42:270
2136259993426,6cyclictest275-21systemd-journal08:30:012
2136255993427,5cyclictest275-21systemd-journal08:50:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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