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2026-03-26 - 00:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #6

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot6s.osadl.org (updated Wed Mar 25, 2026 12:43:48)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24671211997,17sleep30-21swapper/307:09:273
24003211693,18sleep00-21swapper/007:05:550
22926211595,14sleep10-21swapper/107:05:081
247052113102,6sleep20-21swapper/207:09:542
14662830,0sleep20-21swapper/209:35:172
255792790,1sleep011-21rcuc/009:26:130
115042770,1sleep20-21swapper/210:20:142
35472740,0sleep0101ktimersoftd/012:27:230
73942200,1sleep37396-21unixbench_multi12:31:023
199302200,0sleep30-21swapper/312:10:183
90162190,0sleep00-21swapper/009:43:330
24744991915,2cyclictest391-21kworker/u8:110:50:053
24743991916,2cyclictest25596-21kworker/u8:010:39:052
24744991815,2cyclictest15492-21kworker/u8:111:08:053
2474499181,15cyclictest28384-21sed11:11:023
24744991714,2cyclictest19806-21kworker/u8:010:02:053
24743991714,2cyclictest29304-21kworker/u8:009:17:042
24743991714,2cyclictest23537-21kworker/u8:009:28:052
24742991714,2cyclictest29304-21kworker/u8:009:14:051
24742991714,2cyclictest19806-21kworker/u8:010:06:021
24741991714,2cyclictest4264-21kworker/u8:010:21:050
24744991613,2cyclictest4264-21kworker/u8:010:13:043
2474499161,13cyclictest372-21ssh10:41:583
24743991613,2cyclictest3713-21kworker/u8:011:33:052
24743991613,2cyclictest18929-21kworker/u8:112:12:052
24743991613,2cyclictest17357-21kworker/u8:211:38:052
24743991613,2cyclictest15492-21kworker/u8:111:12:062
24743991613,2cyclictest13574-21kworker/u8:212:32:052
24743991613,2cyclictest10884-21kworker/u8:210:29:042
2474199160,14cyclictest4944-21apt-get09:00:120
2474499151,3cyclictest2535-21ssh10:45:043
24744991512,2cyclictest4264-21kworker/u8:010:15:053
24744991512,2cyclictest3713-21kworker/u8:011:34:053
24744991512,2cyclictest23537-21kworker/u8:009:45:053
24744991512,2cyclictest23537-21kworker/u8:009:45:043
24744991512,2cyclictest19806-21kworker/u8:009:56:023
2474499151,12cyclictest28039-21sh10:36:543
2474499150,3cyclictest28283-21latency_hist12:20:003
2474499150,13cyclictest0-21swapper/312:04:533
24743991512,2cyclictest4431-21kworker/u8:108:58:022
24743991512,2cyclictest4264-21kworker/u8:010:16:052
24743991512,2cyclictest391-21kworker/u8:110:43:052
24743991512,2cyclictest24931-21kworker/u8:012:27:052
24743991512,2cyclictest15492-21kworker/u8:110:59:052
2474399150,13cyclictest9030-21apt-get07:50:122
2474299150,13cyclictest8383-21missed_timers10:50:151
2474299150,13cyclictest0-21swapper/110:15:111
2474199150,13cyclictest4154-21timerwakeupswit08:56:020
24744991411,2cyclictest9065-21kworker/u8:007:58:053
24744991411,2cyclictest7984-21kworker/u8:109:42:043
24744991411,2cyclictest4431-21kworker/u8:109:00:053
24744991411,2cyclictest4264-21kworker/u8:010:22:063
24744991411,2cyclictest19581-21ssh10:28:333
24744991411,2cyclictest0-21swapper/311:44:333
24744991411,2cyclictest0-21swapper/311:37:023
24744991411,2cyclictest0-21swapper/311:25:513
24744991411,2cyclictest0-21swapper/311:18:503
24744991411,2cyclictest0-21swapper/309:52:483
24744991411,2cyclictest0-21swapper/309:30:123
24744991411,2cyclictest0-21swapper/308:10:123
2474499140,3cyclictest30455-21ssh10:05:263
2474499140,2cyclictest0-21swapper/312:20:433
2474499140,2cyclictest0-21swapper/311:46:233
2474499140,2cyclictest0-21swapper/311:01:513
2474499140,2cyclictest0-21swapper/308:55:143
2474499140,2cyclictest0-21swapper/307:36:013
2474499140,2cyclictest0-21swapper/307:16:023
2474499140,13cyclictest0-21swapper/309:15:213
2474499140,12cyclictest3219-21ssh11:53:253
2474499140,11cyclictest0-21swapper/310:59:543
24743991411,2cyclictest5081-21kworker/u8:107:48:052
24743991411,2cyclictest4806-21kworker/u8:112:01:052
24743991411,2cyclictest391-21kworker/u8:110:47:052
24743991411,2cyclictest32697-21kworker/u8:208:13:052
2474399141,12cyclictest301ktimersoftd/212:24:592
24743991411,2cyclictest28575-21kworker/u8:007:26:052
24743991411,2cyclictest19806-21kworker/u8:009:58:052
24743991411,2cyclictest16854-21kworker/u8:108:18:052
24743991411,2cyclictest16364-21kworker/u8:107:22:052
24743991411,2cyclictest15492-21kworker/u8:111:48:062
24743991411,2cyclictest15492-21kworker/u8:111:26:042
24743991411,2cyclictest15492-21kworker/u8:111:09:052
24743991411,2cyclictest12821-21kworker/u8:309:48:022
24743991411,2cyclictest12821-21kworker/u8:309:48:022
24743991411,2cyclictest10884-21kworker/u8:210:30:052
24743991411,2cyclictest0-21swapper/212:09:282
24743991410,2cyclictest0-21swapper/208:30:132
2474399140,3cyclictest528-21ssh10:08:482
2474399140,3cyclictest12676-21ssh09:13:402
2474399140,2cyclictest0-21swapper/209:06:032
2474399140,12cyclictest0-21swapper/211:51:042
2474399140,12cyclictest0-21swapper/209:30:172
24742991411,2cyclictest4806-21kworker/u8:111:56:051
24742991411,2cyclictest13574-21kworker/u8:212:06:041
24742991411,2cyclictest0-21swapper/110:40:151
24742991410,2cyclictest6763-21cut09:05:001
2474299140,12cyclictest9090-21apt-get12:00:071
2474299140,12cyclictest18952-21apt-get12:10:111
2474299140,12cyclictest0-21swapper/110:21:051
2474299140,12cyclictest0-21swapper/109:25:191
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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