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2026-05-16 - 08:56

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 Sat May 16, 2026 00:44:22)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30079992623,2cyclictest22380-21sh22:33:472
3007999260,25cyclictest75-21kswapd000:12:142
3007899260,3cyclictest7519-21cut21:52:211
3008199250,24cyclictest1460-21ssh22:15:483
30079992519,3cyclictest23656-21diskmemload22:10:582
3007999250,1cyclictest19579-21ssh00:25:242
30078992525,0cyclictest0-21swapper/123:04:591
3007899250,24cyclictest0-21swapper/122:15:021
3007899250,24cyclictest0-21swapper/122:12:411
30077992524,1cyclictest0-21swapper/021:40:450
3007799250,24cyclictest23656-21diskmemload22:58:170
3008199240,24cyclictest0-21swapper/321:24:323
3007999240,23cyclictest30154-21ssh00:06:252
3007999240,23cyclictest0-21swapper/223:35:382
3007999240,23cyclictest0-21swapper/223:12:272
3007999240,1cyclictest23656-21diskmemload22:47:162
3007999240,0cyclictest0-21swapper/223:57:472
3007999240,0cyclictest0-21swapper/221:33:562
3007999240,0cyclictest0-21swapper/221:33:562
3007899240,24cyclictest0-21swapper/121:40:471
3007899240,24cyclictest0-21swapper/100:16:531
3007899240,23cyclictest23656-21diskmemload21:33:281
3007899240,23cyclictest23656-21diskmemload21:33:281
3007899240,23cyclictest23656-21diskmemload21:13:141
3007899240,23cyclictest23287-21idleruntime-cro22:35:011
3007899240,23cyclictest0-21swapper/122:48:561
3007899240,23cyclictest0-21swapper/122:20:541
3007899240,23cyclictest0-21swapper/100:11:451
3007899240,23cyclictest0-21swapper/100:04:381
30077992423,1cyclictest23656-21diskmemload00:24:400
30077992422,1cyclictest20885-21apt-get00:27:130
30077992422,1cyclictest0-21swapper/023:12:040
3007799240,23cyclictest25106-21rm23:05:010
3007799240,23cyclictest23656-21diskmemload23:29:140
3007799240,23cyclictest23656-21diskmemload21:47:010
3007799240,23cyclictest17579-21ssh22:02:140
3007799240,23cyclictest0-21swapper/022:25:060
3007799240,23cyclictest0-21swapper/022:16:370
3007799240,0cyclictest0-21swapper/021:31:410
3007799240,0cyclictest0-21swapper/021:31:410
30081992323,0cyclictest23656-21diskmemload21:57:323
30081992323,0cyclictest0-21swapper/323:57:013
30081992323,0cyclictest0-21swapper/323:24:023
30081992323,0cyclictest0-21swapper/323:08:213
30081992323,0cyclictest0-21swapper/321:35:533
30081992323,0cyclictest0-21swapper/300:26:043
3008199230,2cyclictest4647-21ssh23:15:233
3008199230,23cyclictest23656-21diskmemload22:55:543
3008199230,23cyclictest0-21swapper/323:51:043
3008199230,23cyclictest0-21swapper/323:29:193
3008199230,23cyclictest0-21swapper/322:03:033
3008199230,22cyclictest3640-21ssh00:11:453
3008199230,22cyclictest31607-21ssh00:36:183
3008199230,22cyclictest18196-21ssh00:23:523
3008199230,0cyclictest23656-21diskmemload21:11:183
3008199230,0cyclictest0-21swapper/323:38:483
3008199230,0cyclictest0-21swapper/321:54:033
3008199230,0cyclictest0-21swapper/300:00:543
30079992323,0cyclictest0-21swapper/223:40:162
30079992323,0cyclictest0-21swapper/223:00:012
30079992323,0cyclictest0-21swapper/221:16:392
30079992322,0cyclictest0-21swapper/200:19:352
30079992319,3cyclictest0-21swapper/200:39:092
3007999231,22cyclictest5780-1kworker/u9:100:03:282
3007999230,22cyclictest26345-21ssh23:06:412
3007999230,22cyclictest15879-21latency_hist23:25:012
3007999230,22cyclictest10727-21rm23:48:322
3007999230,22cyclictest10488-21ssh21:55:162
3007999230,1cyclictest29285-21ssh21:42:282
3007999230,0cyclictest23656-21diskmemload22:35:082
3007999230,0cyclictest0-21swapper/223:52:262
3007999230,0cyclictest0-21swapper/223:33:442
3007999230,0cyclictest0-21swapper/222:43:532
3007999230,0cyclictest0-21swapper/222:26:412
3007999230,0cyclictest0-21swapper/222:21:472
3007999230,0cyclictest0-21swapper/221:53:312
3007999230,0cyclictest0-21swapper/221:36:252
3007999230,0cyclictest0-21swapper/200:24:512
30078992323,0cyclictest0-21swapper/122:26:521
30078992323,0cyclictest0-21swapper/122:05:301
30078992323,0cyclictest0-21swapper/100:35:321
30078992323,0cyclictest0-21swapper/100:20:111
30078992322,1cyclictest0-21swapper/122:50:411
30078992322,1cyclictest0-21swapper/122:01:491
30078992321,1cyclictest2846-21apt-get19:22:131
30078992321,1cyclictest0-21swapper/123:19:501
30078992321,1cyclictest0-21swapper/122:37:201
30078992321,1cyclictest0-21swapper/121:27:371
3007899230,23cyclictest0-21swapper/122:44:381
3007899230,22cyclictest32529-21ssh23:11:531
3007899230,22cyclictest30449-21sh21:16:141
3007899230,22cyclictest30414-21kworker/u8:221:20:071
3007899230,22cyclictest18771-21rm23:56:271
3007899230,22cyclictest17308-21ssh23:26:341
3007899230,22cyclictest0-21swapper/123:38:371
3007899230,22cyclictest0-21swapper/123:30:321
3007899230,22cyclictest0-21swapper/100:28:221
3007899230,21cyclictest313-21systemd-journal21:10:001
3007899230,1cyclictest23915-21sh21:37:551
3007899230,1cyclictest0-21swapper/123:50:231
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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