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2026-07-17 - 12:34

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, slot #5

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, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot5s.osadl.org (updated Fri Jul 17, 2026 00:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1838399300,29cyclictest0-21swapper/322:47:053
1838399270,0cyclictest0-21swapper/323:27:233
18383992623,3cyclictest0-21swapper/321:16:283
1838399260,25cyclictest0-21swapper/300:07:423
1838399260,1cyclictest0-21swapper/323:56:473
18383992523,2cyclictest0-21swapper/322:33:383
18383992521,3cyclictest0-21swapper/322:12:223
18383992520,4cyclictest0-21swapper/300:30:433
1838399250,5cyclictest13550-21apt-get23:07:223
1838399250,2cyclictest11668-21diskmemload22:06:023
1838399250,24cyclictest0-21swapper/321:44:423
1838399250,21cyclictest0-21swapper/321:27:153
1838399250,1cyclictest24000-21ssh22:18:093
1838399250,1cyclictest23922-21ssh23:44:413
1838399250,1cyclictest0-21swapper/323:31:103
1838399250,0cyclictest11668-21diskmemload22:02:473
1838399250,0cyclictest0-21swapper/323:50:393
1838399250,0cyclictest0-21swapper/322:35:223
1838399250,0cyclictest0-21swapper/300:21:143
1838399250,0cyclictest0-21swapper/300:17:223
1838099250,24cyclictest0-21swapper/223:21:182
18378992523,1cyclictest0-21swapper/122:14:051
1837899250,24cyclictest11668-21diskmemload23:17:291
1837899250,24cyclictest11668-21diskmemload22:37:381
1837899250,24cyclictest11668-21diskmemload21:13:551
1837899250,24cyclictest0-21swapper/122:01:431
1837899250,1cyclictest18828-21sh23:12:101
1837899250,1cyclictest0-21swapper/123:22:211
18373992522,2cyclictest0-21swapper/023:09:540
1837399250,1cyclictest18432-21ssh00:07:420
1838399242,1cyclictest9139-21sh21:37:073
18383992421,3cyclictest7378-21kworker/u8:200:00:073
18383992420,3cyclictest24882-21apt-get20:32:223
18383992420,3cyclictest0-21swapper/321:47:223
18383992418,5cyclictest24890-21sh00:13:533
1838399240,23cyclictest11668-21diskmemload23:47:033
1838399240,23cyclictest0-21swapper/323:16:043
1838399240,23cyclictest0-21swapper/322:56:323
1838399240,23cyclictest0-21swapper/321:11:443
1838399240,20cyclictest11668-21diskmemload21:55:023
1838399240,1cyclictest0-21swapper/321:24:173
1838399240,0cyclictest0-21swapper/323:36:533
1838399240,0cyclictest0-21swapper/321:30:403
18380992423,0cyclictest0-21swapper/221:53:282
18380992422,1cyclictest3067-21cron22:00:002
1838099240,23cyclictest21547-21kernelversion21:47:272
1838099240,23cyclictest11668-21diskmemload23:27:242
1838099240,23cyclictest0-21swapper/221:36:002
1838099240,0cyclictest11668-21diskmemload22:33:552
1838099240,0cyclictest0-21swapper/222:49:162
1838099240,0cyclictest0-21swapper/221:43:262
18378992424,0cyclictest0-21swapper/121:27:491
18378992424,0cyclictest0-21swapper/100:10:001
18378992423,1cyclictest30921-21ssh23:50:461
18378992422,2cyclictest13836-21ssh23:36:011
18378992422,1cyclictest24712-21ssh22:19:121
18378992422,1cyclictest0-21swapper/100:40:011
18378992421,2cyclictest11668-21diskmemload22:22:311
1837899240,24cyclictest0-21swapper/123:25:381
1837899240,23cyclictest5205-21ssh00:25:401
18373992423,1cyclictest62550irq/127-eno123:45:010
18373992422,1cyclictest9700-21cron22:35:000
1837399240,23cyclictest0-21swapper/021:26:140
1837399240,0cyclictest0-21swapper/022:06:030
1837399240,0cyclictest0-21swapper/021:10:240
18383992321,1cyclictest0-21swapper/322:41:353
18383992320,2cyclictest31656-21sh22:25:423
18383992319,3cyclictest11668-21diskmemload23:04:173
18383992318,4cyclictest0-21swapper/322:23:263
18383992317,5cyclictest29277-21idleruntime-cro20:40:013
1838399230,22cyclictest5543-21ssh00:26:053
1838399230,0cyclictest0-21swapper/300:36:413
18380992323,0cyclictest11668-21diskmemload23:42:472
18380992323,0cyclictest0-21swapper/222:12:202
18380992323,0cyclictest0-21swapper/222:02:452
18380992323,0cyclictest0-21swapper/200:23:182
18380992323,0cyclictest0-21swapper/200:14:142
18380992322,1cyclictest11668-21diskmemload22:53:232
18380992321,1cyclictest0-21swapper/222:43:042
18380992321,1cyclictest0-21swapper/221:11:182
1838099230,23cyclictest0-21swapper/223:50:392
1838099230,23cyclictest0-21swapper/200:36:062
1838099230,22cyclictest31895-21kworker/u8:022:26:172
1838099230,22cyclictest15391-21awk22:40:002
1838099230,22cyclictest11668-21diskmemload00:17:072
1838099230,22cyclictest11668-21diskmemload00:02:462
1838099230,22cyclictest0-21swapper/223:37:552
1838099230,22cyclictest0-21swapper/222:20:272
1838099230,1cyclictest0-21swapper/223:33:192
1838099230,18cyclictest29265-21perf20:40:012
1838099230,0cyclictest11668-21diskmemload21:32:182
1838099230,0cyclictest0-21swapper/223:55:142
1838099230,0cyclictest0-21swapper/223:46:052
18378992323,0cyclictest11668-21diskmemload21:50:211
18378992323,0cyclictest0-21swapper/122:53:241
18378992323,0cyclictest0-21swapper/121:21:411
18378992323,0cyclictest0-21swapper/100:21:501
18378992321,1cyclictest0-21swapper/123:46:521
18378992321,1cyclictest0-21swapper/120:05:011
18378992321,1cyclictest0-21swapper/119:45:001
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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