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2026-04-19 - 05:20

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 Sun Apr 19, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
224899270,22cyclictest28501-21diskmemload00:35:013
2248992622,3cyclictest28501-21diskmemload21:22:073
2248992620,5cyclictest3989-21turbostat23:55:013
2248992620,5cyclictest26606-21sendmail-msp20:00:003
2248992522,3cyclictest0-21swapper/321:26:443
2248992520,4cyclictest611-21irqbalance22:51:503
2248992520,4cyclictest16322-21ssh00:05:533
2248992519,5cyclictest23583-21grep21:00:013
224899250,24cyclictest0-21swapper/323:42:593
224899250,24cyclictest0-21swapper/323:12:483
224899250,24cyclictest0-21swapper/300:35:023
224899250,20cyclictest0-21swapper/322:14:593
224899250,1cyclictest0-21swapper/322:02:303
224899250,1cyclictest0-21swapper/300:21:153
224899250,0cyclictest0-21swapper/321:40:393
2247992523,1cyclictest9421-21perf00:00:012
2247992523,1cyclictest28501-21diskmemload23:48:212
2247992523,1cyclictest10642-21latency_hist23:30:002
2246992523,1cyclictest0-21swapper/100:27:411
2248992422,1cyclictest606-21dbus-daemon20:20:013
2248992422,1cyclictest0-21swapper/300:04:123
2248992421,3cyclictest28501-21diskmemload00:11:313
2248992421,3cyclictest0-21swapper/320:14:563
2248992421,2cyclictest29285-21processes21:10:053
2248992420,3cyclictest28501-21diskmemload21:56:223
2248992420,3cyclictest28501-21diskmemload00:27:183
224899240,24cyclictest0-21swapper/322:30:173
224899240,24cyclictest0-21swapper/322:26:583
224899240,23cyclictest28501-21diskmemload00:16:073
224899240,23cyclictest2766-21idleruntime22:20:013
224899240,23cyclictest0-21swapper/322:08:283
224899240,0cyclictest1026-21ssh21:45:373
224799240,3cyclictest26169-21latency_hist23:45:012
224799240,23cyclictest22903-21ssh22:07:592
224799240,23cyclictest0-21swapper/223:07:452
224799240,23cyclictest0-21swapper/222:59:362
224799240,1cyclictest9646-21ssh22:25:522
2246992424,0cyclictest28501-21diskmemload21:53:291
2246992423,1cyclictest11222-21sh00:00:501
2246992422,1cyclictest968-21kworker/u8:000:05:041
224699242,21cyclictest606-21dbus-daemon23:00:001
2246992421,2cyclictest12721-21dump-pmu-power22:30:011
224699240,24cyclictest0-21swapper/123:00:031
224699240,23cyclictest24763-21sh21:38:081
224699240,23cyclictest14268-21perf22:00:001
224699240,1cyclictest1796-21ssh00:25:001
224699240,0cyclictest0-21swapper/122:30:441
224699240,0cyclictest0-21swapper/121:33:231
2245992423,1cyclictest0-21swapper/023:52:080
2245992422,1cyclictest9391-21cron00:00:010
2245992422,1cyclictest28501-21diskmemload21:45:010
224599240,24cyclictest0-21swapper/023:35:000
224599240,23cyclictest29127-21sh23:47:180
224599240,23cyclictest0-21swapper/022:43:550
224599240,0cyclictest0-21swapper/022:06:030
2248992323,0cyclictest0-21swapper/323:19:253
2248992320,3cyclictest28501-21diskmemload23:01:023
2248992320,3cyclictest0-21swapper/323:34:553
2248992320,3cyclictest0-21swapper/321:16:343
2248992320,2cyclictest0-21swapper/322:56:093
2248992318,4cyclictest28501-21diskmemload23:36:163
224899230,23cyclictest0-21swapper/321:53:153
224899230,22cyclictest7802-21ssh23:58:443
224899230,22cyclictest0-21swapper/323:21:513
224899230,22cyclictest0-21swapper/322:47:413
224899230,0cyclictest0-21swapper/323:47:393
224899230,0cyclictest0-21swapper/323:26:173
224899230,0cyclictest0-21swapper/322:40:143
224899230,0cyclictest0-21swapper/322:22:353
2247992323,0cyclictest0-21swapper/222:49:532
2247992323,0cyclictest0-21swapper/222:13:282
2247992321,1cyclictest5231-21awk23:25:012
2247992321,1cyclictest28501-21diskmemload21:19:332
2247992321,1cyclictest14115-21apt-get19:34:582
2247992321,1cyclictest0-21swapper/221:55:282
2247992320,2cyclictest5046-21ssh22:52:492
2247992320,2cyclictest16292-21ssh23:04:352
224799231,21cyclictest2100-21ssh23:52:452
224799230,2cyclictest28939-21sh21:41:382
224799230,22cyclictest18484-21ssh23:37:082
224799230,22cyclictest12629-21apt-get00:35:022
224799230,22cyclictest0-21swapper/222:41:452
224799230,22cyclictest0-21swapper/221:25:412
224799230,0cyclictest28501-21diskmemload23:32:362
224799230,0cyclictest28501-21diskmemload00:12:032
224799230,0cyclictest0-21swapper/200:16:052
2246992323,0cyclictest28501-21diskmemload21:17:451
2246992323,0cyclictest0-21swapper/123:58:271
2246992323,0cyclictest0-21swapper/121:26:071
2246992321,1cyclictest26587-21ssh22:42:551
2246992321,1cyclictest19389-21ssh22:35:131
2246992321,1cyclictest0-21swapper/100:20:011
2246992320,2cyclictest19777-21ssh23:07:001
224699230,23cyclictest0-21swapper/123:24:191
224699230,23cyclictest0-21swapper/123:14:091
224699230,23cyclictest0-21swapper/122:03:061
224699230,22cyclictest32562-21diskmemload22:17:041
224699230,22cyclictest31864-21ssh22:47:411
224699230,22cyclictest30822-21rm21:44:391
224699230,22cyclictest29181-21sh21:10:041
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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