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2025-12-27 - 21:13

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 Tue Dec 23, 2025 12:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
222484522010,3sleep3575-21kworker/3:2+events09:44:003
232811921890,4sleep30-21swapper/311:29:003
21565522670,6chrt0-21swapper/208:34:012
22749332610,1sleep02274939-21tr10:34:000
2072368995747,7cyclictest2262216-21latency_hist10:20:010
2072373995042,6cyclictest2072248-21kworker/u8:3+flush-8:007:29:091
20971252470,5sleep30-21swapper/307:34:033
2072368994739,5cyclictest2296667-21latency_hist10:55:010
2072373994639,4cyclictest2217685-21kworker/u8:1+flush-8:009:53:561
2072368994615,16cyclictest0-21swapper/011:23:550
2072376994540,3cyclictest2217685-21kworker/u8:1+events_unbound10:30:012
2072376994539,4cyclictest2257299-21kworker/u8:0+flush-8:010:54:152
2072368994527,16cyclictest2375085-21ntpq12:14:050
2072368994523,19cyclictest2301612-21latency_hist11:00:010
2072373994434,7cyclictest2380718-21latency_hist12:20:011
2072368994411,17cyclictest0-21swapper/008:11:190
2072373994233,6cyclictest2400433-21latency_hist12:40:011
2072373994232,7cyclictest2217685-21kworker/u8:1+flush-8:010:19:101
2072368994118,20cyclictest2093232-21ntpq07:29:040
2072373994032,5cyclictest2148745-21latency_hist08:25:001
2072368994022,15cyclictest2350870-21latency_hist11:50:000
2072376993935,3cyclictest2207756-21kworker/u8:2+events_unbound10:25:002
2072373993929,8cyclictest2182578-21ntpq08:59:081
2072368993919,18cyclictest2340892-21unixbench_multi11:39:150
2072376993831,5cyclictest2118732-21apt-get07:55:002
2072376993830,6cyclictest2108765-21gpgv07:45:002
2072373993828,7cyclictest2129567-21/usr/sbin/munin08:09:041
2072368993828,8cyclictest278-21systemd-journal11:05:000
2072376993732,3cyclictest2109163-21kworker/u8:1+flush-8:009:04:132
2072373993732,3cyclictest2113872-21systemd-run07:50:001
20676422374,10sleep10-21swapper/107:05:331
2072373993626,7cyclictest2163510-21latency_hist08:40:011
207236899362,12cyclictest2213299-21apt-get09:33:560
207236899361,7cyclictest2341575-21/usr/sbin/munin11:43:520
207236899361,7cyclictest2341575-21/usr/sbin/munin11:43:520
207236899361,33cyclictest2291126-21ntpq10:49:060
2072376993531,3cyclictest2257299-21kworker/u8:0+flush-8:011:29:012
2072373993528,5cyclictest2382200-21tail12:23:581
2072368993525,8cyclictest2192413-21ntpq09:09:070
2072376993430,3cyclictest2257299-21kworker/u8:0+flush-8:011:59:122
2072376993429,4cyclictest2257299-21kworker/u8:0+flush-8:012:19:052
2072373993424,7cyclictest2326173-21latency_hist11:25:011
207236899349,8cyclictest2222605-21latency_hist09:40:010
2072368993418,14cyclictest2168298-21unixbench_multi08:44:120
2072368993417,15cyclictest2159669-21irqcore08:38:590
2072368993414,17cyclictest2395730-21sshd12:35:110
207236899341,12cyclictest2391105-21apt-get12:33:550
207236899341,10cyclictest2351841-21/usr/sbin/munin11:53:580
2072368993410,7cyclictest1-21systemd07:15:010
207236899340,15cyclictest2386425-21/usr/sbin/munin12:28:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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