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2025-12-21 - 00:26

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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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: ondemand
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack5slot4s.osadl.org (updated Sat Dec 20, 2025 12:44:13)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28539752860,1sleep02853980-21tr11:44:060
26542122530,5chrt0-21swapper/208:24:022
29076832450,4sleep30-21swapper/312:39:063
2581797994434,8cyclictest278-21systemd-journal12:30:001
2581797994434,8cyclictest278-21systemd-journal12:30:001
2581793994437,5cyclictest2697646-21kworker/u8:2+flush-8:009:18:590
2581793994437,5cyclictest2392291-21kworker/u8:2+flush-8:007:18:590
2581793994436,5cyclictest2736773-21latency_hist09:45:010
2581793994334,7cyclictest2667614-21latency_hist08:35:000
28912472380,2sleep3471rcuc/312:24:063
2581797993525,8cyclictest278-21systemd-journal12:19:091
2581797993525,8cyclictest2765692-21ntpq10:14:071
2581793993530,4cyclictest2751922-40mandb10:02:100
2581793993524,8cyclictest2652601-21latency_hist08:20:000
2581797993424,7cyclictest2642751-21latency_hist08:10:011
2581793993426,6cyclictest2718001-21grep09:29:000
2581793993422,10cyclictest2673575-21diskstats08:43:590
2581793993422,10cyclictest2673575-21diskstats08:43:580
2581797993327,4cyclictest2865192-21cron11:55:001
2581797993325,5cyclictest2608210-21latency_hist07:35:011
258179399331,29cyclictest411-21dbus-daemon12:05:010
2581797993224,6cyclictest278-21systemd-journal12:04:401
2581793993227,4cyclictest2746616-21kworker/u8:1+events_unbound11:08:570
2581793993227,3cyclictest20643-21cron07:55:000
2581793993224,6cyclictest2642998-21kworker/u8:0+flush-8:008:49:000
2581800993110,9cyclictest0-21swapper/209:55:002
2581793993122,6cyclictest2864543-21ntpq11:54:100
25771902314,9sleep20-21swapper/207:06:592
2581797993025,3cyclictest2850424-21cron11:40:011
2581797993025,3cyclictest1-21systemd11:09:091
2581797993024,5cyclictest2392291-21kworker/u8:2+flush-8:007:39:001
2581793993025,4cyclictest2860289-21kworker/u8:3+flush-8:012:13:580
2581793993024,4cyclictest2830699-21cron11:20:000
2581793993024,4cyclictest2830699-21cron11:20:000
2581793993021,6cyclictest2845522-21latency_hist11:35:010
2581797992922,6cyclictest2836278-21aten2_r5power_p11:28:581
2581797992921,6cyclictest2746511-21unixbench_singl09:54:181
2581793992924,3cyclictest2677555-21kworker/u8:1+flush-8:008:54:010
2581793992922,5cyclictest2810646-21unixbench_multi10:59:170
2581793992920,6cyclictest2835643-21latency_hist11:25:000
2581793992918,8cyclictest2586036-21ntpq07:14:080
2581797992824,2cyclictest0-21swapper/108:35:001
2581797992822,4cyclictest2622888-21unixbench_singl07:49:151
2581797992819,7cyclictest2652605-21apt08:20:001
2581797992818,8cyclictest278-21systemd-journal08:05:001
2581793992824,2cyclictest2879283-21needreboot12:09:040
2581793992823,3cyclictest2741650-21cron09:50:000
2581793992823,3cyclictest2608223-21systemd-run07:35:010
2581793992821,5cyclictest2624678-21kworker/u8:2+flush-8:007:59:030
2581793992820,6cyclictest2766294-21latency_hist10:15:020
2581800992724,2cyclictest2747231-21aten2_r5power_p09:58:562
2581800992724,2cyclictest2582292-21aten2_r5power_c07:13:562
2581800992720,5cyclictest2678240-21apt-get08:48:552
2581797992723,2cyclictest2835664-21systemd-run11:25:011
2581797992721,4cyclictest2767215-21fschecks_time10:19:001
2581797992719,6cyclictest2717653-21apt-get09:28:551
2581793992724,2cyclictest2908808-21needreboot12:39:080
2581793992722,2cyclictest0-21swapper/010:00:000
258180099268,3cyclictest26700482cut08:39:052
2581800992622,2cyclictest2702148-21unixbench_multi09:09:152
2581800992622,2cyclictest2628696-21cpuspeed_turbos07:58:582
258180099260,9cyclictest2813004-21cut11:04:062
2581797992623,2cyclictest2876209-21irqcore12:09:001
2581797992622,3cyclictest2642998-21kworker/u8:0+flush-8:008:49:121
2581797992621,4cyclictest2790975-21unixbench_singl10:39:151
2581797992621,4cyclictest2598294-21unixbench_singl07:24:151
2581797992621,4cyclictest2598294-21unixbench_singl07:24:151
2581797992620,4cyclictest2860289-21kworker/u8:3+flush-8:012:24:161
2581797992620,4cyclictest2781237-21cron10:30:001
258179399266,18cyclictest2657798-21kworker/0:0+events09:13:290
258179399265,18cyclictest2850485-21kworker/0:0+events12:30:130
258179399262,20cyclictest2657798-21kworker/0:0+events09:35:250
2581793992621,4cyclictest0-21swapper/011:14:090
2581793992611,12cyclictest278-21systemd-journal08:29:150
26700452250,1sleep02670048-21cut08:39:050
258180099256,2cyclictest27042672kthreadcore09:14:042
2581800992522,2cyclictest2870720-21aten2_r5power_e12:03:562
2581800992522,2cyclictest2767064-21cpuspeed_turbos10:18:592
258180099250,10cyclictest2626501-21tr07:54:052
2581797992521,3cyclictest2802222-21irqrtprio10:54:021
2581797992521,2cyclictest0-21swapper/112:14:091
2581797992521,2cyclictest0-21swapper/111:00:001
2581797992521,2cyclictest0-21swapper/109:39:001
2581797992521,2cyclictest0-21swapper/108:00:011
2581797992520,4cyclictest2756326-21unixbench_multi10:04:141
2581797992520,4cyclictest2722012-21kworker/u8:3+events_unbound09:58:571
2581797992520,4cyclictest2603192-21unixbench_singl07:29:181
2581797992520,3cyclictest2904503-21unixbench_singl12:34:161
2581797992519,5cyclictest2716967-21unixbench_multi09:24:151
2581797992518,5cyclictest278-21systemd-journal09:09:211
2581797992518,5cyclictest2695170-21kthreadcore09:04:031
258179399256,18cyclictest2781264-21kworker/0:1+events10:44:060
258179399252,22cyclictest2613194-21kworker/0:1+events08:20:010
258179399252,22cyclictest0-21swapper/009:24:130
2581793992520,3cyclictest2697255-21unixbench_singl09:04:140
2581793992520,3cyclictest0-21swapper/009:35:000
258180099242,7cyclictest0-21swapper/211:29:062
258180099242,7cyclictest0-21swapper/211:17:462
258180099242,7cyclictest0-21swapper/211:17:462
2581800992421,2cyclictest2717739-21aten2_r5power_p09:28:582
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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