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2026-05-24 - 18:35

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot4s.osadl.org (updated Sun May 24, 2026 12:44:06)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2357803994135,4cyclictest2634697-21latency_hist11:35:012
2357799994033,5cyclictest2624368-21latency_hist11:25:011
2357805993933,4cyclictest2368017-21latency_hist07:20:003
2357795993834,3cyclictest2567206-21apt-get10:30:120
2357805993731,4cyclictest2530804-21latency_hist09:55:003
2357803993732,3cyclictest2577362-21latency_hist10:40:012
2357803993731,4cyclictest2671330-21latency_hist12:10:002
2357795993428,4cyclictest2629541-21latency_hist11:30:010
2357803993326,6cyclictest2690929-21kworker/u8:0+flush-259:012:30:002
2357795993227,4cyclictest2598371-21apt-get11:00:130
2357803993125,4cyclictest2404923-40mandb07:54:172
2357803993026,2cyclictest2315374-21kworker/u8:3+flush-259:007:15:162
2357795993026,3cyclictest2598125-21kworker/u8:0+flush-259:011:55:250
2357795993025,3cyclictest2389276-21kworker/u8:4+flush-259:008:00:010
2357795993025,3cyclictest2389276-21kworker/u8:4+flush-259:008:00:000
2357799992925,3cyclictest509-21rs:main1
2357799992924,4cyclictest335557-21systemd-journal08:53:161
2357799992923,4cyclictest2666162-21latency_hist12:05:001
2357795992923,4cyclictest2619179-21latency_hist11:20:000
235779599290,27cyclictest1-21systemd09:59:160
2357799992824,3cyclictest2587966-21kworker/u8:2+flush-259:011:15:171
2357799992824,3cyclictest2414810-21kworker/u8:1+flush-259:008:15:181
2357805992724,2cyclictest2645703-21kworker/u8:3+flush-259:012:25:003
2357805992722,3cyclictest2468505-21/usr/sbin/munin08:55:163
2357803992723,3cyclictest2494397-21/usr/sbin/munin09:20:162
2357803992721,4cyclictest2414810-21kworker/u8:1+flush-259:008:05:172
2357803992721,4cyclictest2414810-21kworker/u8:1+flush-259:008:05:162
2357803992721,4cyclictest2410340-21cat08:00:012
2357803992721,4cyclictest2410340-21cat08:00:012
2357799992724,2cyclictest2357766-21kworker/u8:1+flush-259:007:40:171
2357795992724,2cyclictest2541414-21kworker/u8:0+flush-259:010:15:240
2357805992620,4cyclictest335557-21systemd-journal11:05:003
2357803992519,4cyclictest335557-21systemd-journal08:13:162
2357799992522,2cyclictest2520506-21kworker/u8:1+flush-259:009:50:001
2357795992520,3cyclictest2394491-21/usr/sbin/munin07:45:130
2357805992420,3cyclictest2315374-21kworker/u8:3+flush-259:008:05:263
2357805992420,3cyclictest2315374-21kworker/u8:3+flush-259:008:05:263
2357805992419,4cyclictest2613613-21apt-get11:15:003
2357803992418,4cyclictest2650666-21latency_hist11:50:012
2357799992420,3cyclictest2442640-21apt-get08:30:091
2357799992420,3cyclictest2431371-21kworker/u8:2+flush-259:008:22:471
2357795992418,4cyclictest2436335-21ntpq08:20:210
2357795992417,5cyclictest2525650-21latency_hist09:50:000
2357805992319,3cyclictest2577386-21kworker/u8:0+flush-259:010:40:243
2357805992318,4cyclictest335557-21systemd-journal08:32:163
2357795992319,3cyclictest2608661-21kworker/u8:1+flush-259:011:25:000
2357795992319,3cyclictest2567167-21kworker/u8:4+flush-259:010:45:170
2357795992319,3cyclictest2414810-21kworker/u8:1+flush-259:009:10:240
2357795992319,3cyclictest2315374-21kworker/u8:3+flush-259:007:15:230
2357795992317,4cyclictest2613613-21apt-get11:15:010
2357805992218,3cyclictest2598125-21kworker/u8:0+flush-259:011:40:243
2357805992218,3cyclictest2431371-21kworker/u8:2+flush-259:008:25:253
2357805992218,3cyclictest2315374-21kworker/u8:3+flush-259:008:10:213
2357803992218,3cyclictest335557-21systemd-journal07:24:282
2357803992217,4cyclictest335557-21systemd-journal10:46:172
2357803992217,4cyclictest2489001-21kworker/u8:3+flush-259:009:45:152
2357799992218,3cyclictest2629557-21kworker/u8:2+flush-259:012:30:161
2357795992215,5cyclictest2377424-21ntpq07:25:210
2357805992117,3cyclictest2598125-21kworker/u8:0+events_unbound11:35:163
2357805992117,3cyclictest2378548-21kworker/u8:0+flush-259:009:15:173
2357805992117,3cyclictest2357766-21kworker/u8:1+flush-259:007:35:253
2357805992115,4cyclictest2598107-21latency_hist11:00:003
2357803992115,4cyclictest2540326-21ntpq10:00:212
2357799992117,3cyclictest2452829-21kworker/u8:2+flush-259:008:45:211
2357799992117,3cyclictest2442609-21kworker/u8:4+flush-259:008:40:001
2357799992117,3cyclictest2414810-21kworker/u8:1+flush-259:009:10:011
2357799992117,3cyclictest2315374-21kworker/u8:3+flush-259:007:25:251
2357795992116,4cyclictest335557-21systemd-journal11:36:170
2357805992017,2cyclictest2499375-21kworker/u8:2+events_unbound09:25:003
2357805992015,4cyclictest2645703-21kworker/u8:3+flush-259:012:00:163
2357805992014,4cyclictest335557-21systemd-journal10:19:593
2357803992014,4cyclictest2362898-21latency_hist07:15:012
2357799992017,2cyclictest2378548-21kworker/u8:0+flush-259:007:45:261
2357799992015,4cyclictest2494155-21latency_hist09:20:001
2357799992015,3cyclictest2660998-21awk12:00:011
2357805991915,3cyclictest335557-21systemd-journal08:49:163
2357805991915,3cyclictest2315374-21kworker/u8:3+flush-259:007:20:223
2357803991915,3cyclictest2357766-21kworker/u8:1+flush-259:007:43:462
2357795991915,3cyclictest2541414-21kworker/u8:0+flush-259:010:20:240
2357805991812,4cyclictest2432253-21cat08:20:013
2357805991812,4cyclictest2383486-21gpgv07:35:003
2357803991815,2cyclictest2414810-21kworker/u8:1+flush-259:008:20:012
2357803991814,3cyclictest335557-21systemd-journal11:15:032
2357803991811,6cyclictest2598109-21latency_hist11:00:002
2357799991815,2cyclictest2613732-21gpgv11:15:011
2357799991814,3cyclictest335557-21systemd-journal11:41:161
2357799991814,3cyclictest335557-21systemd-journal09:05:001
2357799991814,3cyclictest2603556-21apt-get11:05:121
2357799991814,3cyclictest2489001-21kworker/u8:3+flush-259:010:00:161
2357799991813,4cyclictest2520477-21latency_hist09:44:591
2357795991814,3cyclictest2645703-21kworker/u8:3+flush-259:012:20:210
2357795991814,3cyclictest2499454-21gpgv09:25:010
2357795991814,3cyclictest2489001-21kworker/u8:3+flush-259:010:10:210
2357795991812,4cyclictest2482959-21ntpq09:05:210
2357795991812,4cyclictest2478642-21latency_hist09:05:000
2357805991714,2cyclictest2478646-21munin-run09:05:013
2357805991713,3cyclictest2598125-21kworker/u8:0+flush-259:011:55:213
2357805991713,3cyclictest2541414-21kworker/u8:0+flush-259:010:20:163
2357805991713,3cyclictest2357766-21kworker/u8:1+flush-259:007:44:593
2357803991714,2cyclictest2468505-21/usr/sbin/munin08:55:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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