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2026-05-19 - 21:18

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, 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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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 376 highest latencies:
System rack7slot3s.osadl.org (updated Sat May 16, 2026 03:36:46)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2499121080,3sleep00-21swapper/012:31:250
951199752,52cyclictest22403-21/usr/sbin/munin12:26:160
951199698,38cyclictest21434-21timerandwakeup12:21:250
951199661,42cyclictest18482-21modprobe12:16:000
951199651,48cyclictest0-21swapper/012:06:160
951199626,47cyclictest0-21swapper/011:57:090
951499617,31cyclictest0-21swapper/312:06:053
951199611,48cyclictest29716-21wc12:46:000
89962611,14sleep00-21swapper/011:47:560
130242600,1sleep30-21swapper/312:01:003
951199594,34cyclictest30563-21grep12:46:250
951199589,34cyclictest13884-21/usr/sbin/munin12:01:230
951199580,40cyclictest0-21swapper/012:16:250
951299562,42cyclictest30930-21grep12:46:281
951299561,7cyclictest10594-21grep11:51:281
951299533,5cyclictest0-21swapper/112:41:151
951299532,7cyclictest21579-21unixbench-2d12:21:261
951299531,5cyclictest19819-21grep12:16:281
951199533,38cyclictest917-21snmpd12:37:460
9512995213,36cyclictest24155-21cat12:31:011
951199521,38cyclictest31705-21grep12:51:140
951199521,38cyclictest31705-21grep12:51:140
951299502,5cyclictest0-21swapper/112:51:111
951299502,5cyclictest0-21swapper/112:51:111
951299501,7cyclictest11636-21fschecks_count11:56:161
951299491,8cyclictest13517-21tune2fs12:01:171
951299491,6cyclictest27150-21grep12:36:281
951299482,3cyclictest7850irq/56-dwc_otg_12:32:451
951299481,5cyclictest18479-21latency_hist12:16:001
951199488,36cyclictest0-21swapper/011:51:530
951299471,6cyclictest16814-21latency_hist12:11:001
951499453,6cyclictest7950irq/56-dwc_otg_12:21:103
252612450,4sleep3381ktimersoftd/312:31:283
951399436,25cyclictest0-21swapper/212:41:142
951499412,18cyclictest7950irq/56-dwc_otg_12:26:253
951399418,12cyclictest31-21ksoftirqd/212:16:192
951399407,6cyclictest31-21ksoftirqd/212:21:272
951499392,11cyclictest381ktimersoftd/312:46:263
9513993929,7cyclictest22754-21fschecks_time12:26:192
9513993920,4cyclictest29-21rcuc/212:49:072
951399391,21cyclictest25409-21sed12:31:292
9514993714,4cyclictest14878-21latency_hist12:06:013
951399377,26cyclictest0-21swapper/212:11:132
951499369,24cyclictest0-21swapper/311:51:143
951499368,15cyclictest0-21swapper/312:11:133
951399367,6cyclictest7750irq/56-dwc_otg12:11:002
951499352,20cyclictest37-21rcuc/312:54:483
951499352,20cyclictest37-21rcuc/312:54:483
9513993514,5cyclictest31-21ksoftirqd/212:38:002
9513993510,14cyclictest31-21ksoftirqd/212:05:352
9514993413,13cyclictest19191-21/usr/sbin/munin12:16:203
951399341,10cyclictest0-21swapper/211:51:142
951499336,15cyclictest0-21swapper/312:41:143
951399311,15cyclictest0-21swapper/211:59:152
9513993016,8cyclictest7750irq/56-dwc_otg12:51:552
9513993016,8cyclictest7750irq/56-dwc_otg12:51:552
80152296,12sleep18051-21/usr/sbin/munin11:46:201
951499284,11cyclictest39-21ksoftirqd/312:37:463
85442275,12sleep27684-21/usr/sbin/munin11:46:292
89692263,15sleep30-21swapper/311:47:353
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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