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2026-04-10 - 00:45

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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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 50 highest latencies:
System rackeslot5s.osadl.org (updated Thu Apr 09, 2026 12:44:23)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
10672992524,1cyclictest606-21dbus-daemon07:20:012
10672992522,1cyclictest5594-21diskmemload09:59:232
10672992522,1cyclictest305122sleep210:36:342
1067299250,24cyclictest9814-21ssh10:17:362
1066899250,24cyclictest5594-21diskmemload12:13:191
1066899250,1cyclictest25152-21sh11:02:241
1066599250,24cyclictest0-21swapper/012:16:490
10677992424,0cyclictest0-21swapper/312:18:433
1067799240,24cyclictest0-21swapper/311:41:533
1067799240,23cyclictest5594-21diskmemload11:34:313
10672992422,1cyclictest30948-21apt-get08:59:112
10672992422,1cyclictest26440-21rm12:37:282
10672992420,2cyclictest313-21systemd-journal08:05:012
1067299240,3cyclictest0-21swapper/210:57:092
1067299240,23cyclictest5594-21diskmemload10:32:212
1067299240,23cyclictest3224-21sh10:41:302
1067299240,23cyclictest25160-21cron08:45:002
10668992423,1cyclictest8379-21perf08:10:011
10668992422,1cyclictest0-21swapper/111:10:011
1066899240,23cyclictest5594-21diskmemload11:50:141
1066899240,23cyclictest24761-21ssh11:34:111
1066899240,23cyclictest0-21swapper/111:55:271
1066899240,23cyclictest0-21swapper/109:45:561
1066899240,23cyclictest0-21swapper/109:11:401
1066599241,22cyclictest5594-21diskmemload10:24:350
1066599240,24cyclictest5594-21diskmemload11:08:070
1066599240,23cyclictest2838-21munin-plugin-st09:05:010
1066599240,23cyclictest0-21swapper/009:40:460
1066599240,23cyclictest0-21swapper/009:37:540
1066599240,22cyclictest3662-21ssh10:10:530
10677992323,0cyclictest5594-21diskmemload12:00:553
10677992323,0cyclictest0-21swapper/312:13:543
10677992323,0cyclictest0-21swapper/311:57:163
10677992323,0cyclictest0-21swapper/310:58:493
10677992323,0cyclictest0-21swapper/310:32:513
10677992323,0cyclictest0-21swapper/310:05:423
10677992323,0cyclictest0-21swapper/309:59:333
10677992321,1cyclictest5594-21diskmemload10:51:463
10677992321,1cyclictest0-21swapper/311:21:173
10677992320,2cyclictest14369-21ssh12:25:503
1067799230,2cyclictest28081-21unixbench_singl11:04:203
1067799230,2cyclictest15732-21ssh09:19:493
1067799230,23cyclictest0-21swapper/312:37:193
1067799230,23cyclictest0-21swapper/310:44:343
1067799230,23cyclictest0-21swapper/309:49:433
1067799230,22cyclictest606-21dbus-daemon10:25:003
1067799230,22cyclictest29902-21ssh11:06:453
1067799230,22cyclictest26598-21sh10:02:193
1067799230,22cyclictest17269-21ssh11:25:273
1067799230,22cyclictest12790-21perf10:50:013
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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