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2026-07-16 - 01:26

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #7, slot #7

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 50 highest latencies:
System rack7slot7s.osadl.org (updated Wed Jul 15, 2026 12:43:51)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1654229869,9sleep30-21swapper/307:07:243
1668029784,9sleep00-21swapper/007:09:100
1670129648,44sleep10-21swapper/107:09:271
1656128371,8sleep20-21swapper/207:07:402
283212650,0sleep00-21swapper/009:59:430
16829992726,1cyclictest0-21swapper/011:39:200
1682999270,3cyclictest0-21swapper/011:14:380
16833992524,1cyclictest0-21swapper/107:28:141
1683399250,23cyclictest0-21swapper/109:37:301
1682999240,23cyclictest0-21swapper/010:46:170
1683399230,17cyclictest0-21swapper/109:31:471
1682999230,1cyclictest0-21swapper/012:06:190
1683999220,1cyclictest0-21swapper/309:12:333
1683699220,22cyclictest0-21swapper/211:39:392
1683699220,19cyclictest0-21swapper/212:27:362
1683399226,10cyclictest24709-21runrttasks12:12:161
1682999220,20cyclictest0-21swapper/011:20:080
16833992118,1cyclictest0-21swapper/110:38:011
1683999200,20cyclictest0-21swapper/311:13:593
16836992017,2cyclictest32-21ksoftirqd/212:00:002
1683399201,6cyclictest0-21swapper/107:35:151
16829992019,1cyclictest0-21swapper/012:36:190
1682999200,0cyclictest0-21swapper/009:26:200
16829991915,1cyclictest0-21swapper/012:28:230
1683999183,4cyclictest32116-21perf11:00:013
16839991817,1cyclictest0-21swapper/309:54:573
1683999180,3cyclictest453-21ssh12:16:573
1683999180,1cyclictest0-21swapper/310:40:153
1683999180,17cyclictest0-21swapper/311:20:203
1683399182,14cyclictest15607-21ssh10:10:311
16833991816,1cyclictest0-21swapper/112:39:181
16833991815,1cyclictest0-21swapper/109:46:301
1683399181,16cyclictest28111-21cron08:40:011
1682999182,9cyclictest4134-21/usr/sbin/munin09:45:220
1682999180,18cyclictest0-21swapper/011:57:130
1683999170,11cyclictest225-21systemd-journal08:48:423
1683699173,4cyclictest1142-21runrttasks11:40:142
1683699170,1cyclictest0-21swapper/210:07:342
1683699170,17cyclictest0-21swapper/211:18:152
1683699170,17cyclictest0-21swapper/211:13:582
1683399171,1cyclictest0-21swapper/112:22:461
1683999160,16cyclictest0-21swapper/310:17:073
1683999160,15cyclictest0-21swapper/312:28:243
1683999160,0cyclictest0-21swapper/309:29:333
16836991615,1cyclictest4586-21sed12:20:012
1683699161,12cyclictest31333-21runrttasks10:00:292
1683699160,16cyclictest0-21swapper/209:57:532
16833991616,0cyclictest0-21swapper/109:20:241
1683399160,16cyclictest0-21swapper/110:56:121
16829991614,1cyclictest31565-21apt-get10:40:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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