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2025-12-31 - 04:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, slot #7

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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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: performance
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack2slot7s.osadl.org (updated Tue Dec 30, 2025 19:55:40)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1248279996452,8cyclictest1470682-21sh17:39:512
1248276996440,20cyclictest1985993-21sh18:07:401
1248279995947,7cyclictest2028653-21sh18:09:532
1248276995953,3cyclictest0-21swapper/117:39:541
1248270995740,15cyclictest2031455-21sh18:10:020
1248270995736,17cyclictest0-21swapper/017:39:540
1248276995443,6cyclictest1547359-21execl17:50:001
1248276995443,6cyclictest1547359-21execl17:50:001
1248279995345,5cyclictest1547359-21execl17:49:532
1248279995345,5cyclictest1547359-21execl17:49:532
1248279995143,5cyclictest1536958-21multi.sh17:43:072
1248279995021,14cyclictest2060287-21sh18:11:252
1248276995042,5cyclictest1515252-21sh17:42:081
1248270995040,7cyclictest2087189-21sh18:12:420
1248276994839,6cyclictest2058748-21sh18:11:211
1248279994739,5cyclictest1963719-21Run18:04:552
1248270994741,4cyclictest1547360-21execl17:49:390
1248270994741,4cyclictest1547360-21execl17:49:390
1248270994738,6cyclictest1502105-21od17:41:340
1248279994632,9cyclictest2095544-21cron18:20:012
1248279994632,9cyclictest2095544-21cron18:20:012
1248279994232,6cyclictest1251294-21latency_hist17:15:032
1248270994234,5cyclictest1472781-21kworker/u8:12-nfsiod17:56:330
1248279994132,6cyclictest1435911-21cron17:35:002
1248276994133,5cyclictest1548479-21cat17:50:031
1248279994033,4cyclictest812-21cron17:55:002
1248276994032,5cyclictest1250911-21sh17:15:011
1248279993932,3cyclictest0-21swapper/217:56:152
1248279993931,5cyclictest1254496-21cron17:25:012
1248279993930,5cyclictest1248414-21latency_hist17:05:022
1248276993931,5cyclictest1253090-21latency_hist17:20:011
124827699383,29cyclictest1426670-21spawn17:34:551
1248276993827,9cyclictest1552277-21context118:02:071
124827099389,20cyclictest151ktimers/017:29:490
1248279993729,5cyclictest2098152-21cut18:30:002
1248270993731,4cyclictest1-21systemd18:30:010
1248270993722,5cyclictest1688867-21sh18:03:230
1248270993628,4cyclictest0-21swapper/017:34:520
1248270993621,13cyclictest2095550-21cut18:20:010
1248270993621,13cyclictest2095550-21cut18:20:010
1248270993618,14cyclictest1548826-21execl17:50:570
1248279993527,5cyclictest1252572-21whetstone-doubl17:20:002
1248276993428,3cyclictest0-21swapper/118:20:011
1248276993428,3cyclictest0-21swapper/118:20:011
1248270993428,3cyclictest0-21swapper/018:35:010
1248270993419,5cyclictest1249703-21unixbench_multi17:09:570
1248279993325,4cyclictest2097204-21latency_hist18:25:022
1248279993325,4cyclictest2097204-21latency_hist18:25:022
1248279993318,10cyclictest2100899-21ntpq18:39:542
124827099333,21cyclictest151ktimers/018:39:510
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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