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2025-12-15 - 12:38

OSADL QA Farm on Real-time of Mainline Linux

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

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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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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack3slot3s.osadl.org (updated Mon Dec 15, 2025 00:43:55)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2530087212357,61sleep30-21swapper/319:07:173
253010529056,9sleep10-21swapper/119:07:321
253015928756,10sleep20-21swapper/219:08:132
252998227253,13sleep00-21swapper/019:05:590
2530418992825,1cyclictest0-21swapper/320:04:593
2530418992421,1cyclictest0-21swapper/323:55:013
2530418992118,1cyclictest0-21swapper/320:10:163
2530418992118,1cyclictest0-21swapper/319:25:013
2530418992017,1cyclictest0-21swapper/323:40:013
2530418992016,2cyclictest0-21swapper/321:50:173
253041899192,11cyclictest2658497-21taskset21:05:203
253041899192,11cyclictest2658497-21taskset21:05:203
2530418991916,1cyclictest0-21swapper/320:30:213
2530418991915,2cyclictest0-21swapper/300:10:163
253041899191,14cyclictest0-21swapper/319:25:123
253041899191,13cyclictest0-21swapper/320:50:213
27848362181,12sleep12784878-21ntpq23:05:191
253041899189,6cyclictest2696097-21turbostat21:45:013
253041899188,6cyclictest2738293-21taskset22:24:323
253041899188,2cyclictest26701512sleep321:20:073
2530418991815,1cyclictest0-21swapper/323:00:163
2530418991815,1cyclictest0-21swapper/320:40:163
2530418991815,1cyclictest0-21swapper/319:10:193
2530418991815,1cyclictest0-21swapper/300:05:193
253041899181,14cyclictest0-21swapper/322:15:133
253041899181,14cyclictest0-21swapper/300:20:233
253041899181,13cyclictest2664657-21turbostat21:15:003
253041899181,13cyclictest2612443-21chrt20:25:123
253041899181,13cyclictest0-21swapper/323:55:223
253041899181,13cyclictest0-21swapper/320:15:113
253041899181,12cyclictest2775296-21taskset22:59:553
253041899181,12cyclictest0-21swapper/320:55:113
25760082171,8sleep12577502-21kthreadcore19:50:161
25429282171,8sleep22542929-21cat19:19:552
2530418991714,1cyclictest0-21swapper/323:15:163
2530418991714,1cyclictest0-21swapper/322:45:213
2530418991714,1cyclictest0-21swapper/300:35:183
253041899171,3cyclictest0-21swapper/322:50:133
253041899171,14cyclictest0-21swapper/319:40:153
253041899171,13cyclictest2786086-21taskset23:10:013
253041899171,13cyclictest0-21swapper/323:45:133
253041899171,12cyclictest2839070-21chrt00:00:113
253041899171,12cyclictest0-21swapper/322:00:113
253041899171,11cyclictest2559293-21chrt19:34:383
253041899171,10cyclictest2801360-21taskset23:22:443
253041899171,10cyclictest2711490-21taskset21:55:383
253041899171,10cyclictest2579795-21taskset19:50:243
2530418991710,3cyclictest26275852sleep320:35:553
253041899170,10cyclictest2758603-21taskset22:40:193
27743292160,1sleep00-21swapper/022:55:200
2530418991613,1cyclictest0-21swapper/319:45:173
2530418991612,2cyclictest0-21swapper/323:40:023
253041899161,13cyclictest0-21swapper/300:25:163
253041899161,12cyclictest0-21swapper/300:15:263
253041899161,11cyclictest2564623-21sleep19:40:003
253041899161,11cyclictest0-21swapper/322:30:123
253041899161,10cyclictest2612156-21taskset20:24:563
253041899161,10cyclictest2591407-21chrt20:05:083
253041899161,10cyclictest2537885-21taskset19:15:063
253041899160,13cyclictest0-21swapper/321:45:163
253041899160,13cyclictest0-21swapper/321:15:193
253041899160,13cyclictest0-21swapper/300:30:193
253041899160,12cyclictest0-21swapper/322:35:143
253041899160,12cyclictest0-21swapper/321:35:133
28536442151,9sleep02853677-21ntpq00:10:190
28332542151,9sleep12833359-21cut23:55:011
27496502151,10sleep22749672-21/usr/sbin/munin22:35:142
27287052154,6sleep12728738-21kthreadcore22:15:171
26823542151,5sleep12684148-21grep21:30:161
25865132151,9sleep22588073-21tr20:00:152
25846702151,9sleep02580662-21/usr/sbin/munin19:55:200
25490722151,10sleep02549196-21perl19:25:140
253041899152,8cyclictest2722909-21taskset22:10:133
253041899152,8cyclictest2722909-21taskset22:10:133
2530418991513,1cyclictest0-21swapper/322:10:003
2530418991511,2cyclictest0-21swapper/321:00:253
253041899151,11cyclictest2743597-21turbostat22:30:003
253041899151,10cyclictest0-21swapper/321:30:113
253041899150,12cyclictest0-21swapper/323:25:233
253041899150,12cyclictest0-21swapper/321:25:143
253041899150,11cyclictest0-21swapper/323:05:113
253041899150,10cyclictest25806612sleep319:55:113
27643672140,3sleep02764370-21grep22:45:250
25654442146,4sleep22566735-21cut19:40:142
253041899141,9cyclictest2633777-21chrt20:45:123
2530418991411,2cyclictest0-21swapper/323:30:243
25853822131,8sleep22585383-21sshd19:56:552
25527922131,7sleep22552848-21ntp_kernel_pll_19:25:202
25346272131,9sleep12534673-21ntpq19:10:161
27952982121,5sleep02795345-21ntpq23:15:200
26811762121,3sleep02682353-21cut21:30:150
26534472121,7sleep22653458-21mailstats21:00:232
26235132121,7sleep02624640-21kthreadcore20:35:160
25487862121,7sleep12548788-21acpi19:25:111
25344852122,5sleep02534626-21ntpq19:10:150
28617242111,6sleep10-21swapper/100:20:181
28386402110,1sleep00-21swapper/000:00:010
28239022111,6sleep02825602-21kthreadcore23:45:170
27694602111,4sleep02769676-21users22:50:260
27021542111,6sleep22703306-21kthreadcore21:50:172
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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