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2026-01-01 - 22:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #3, slot #3

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 100 highest latencies:
System rack3slot3s.osadl.org (updated Thu Jan 01, 2026 12:43:56)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1546269212165,52sleep30-21swapper/307:05:333
154628328553,9sleep20-21swapper/207:05:442
154657627661,9sleep10-21swapper/107:09:291
154640127354,14sleep00-21swapper/007:07:150
16902052400,2sleep20-21swapper/209:20:182
1546735992522,1cyclictest0-21swapper/310:20:003
1546735992420,2cyclictest0-21swapper/311:40:013
17632092230,2sleep30-21swapper/310:30:193
1546735992320,1cyclictest0-21swapper/312:10:003
154673599225,11cyclictest1828066-21taskset11:34:563
1546735992219,1cyclictest0-21swapper/308:45:113
1546735992117,2cyclictest0-21swapper/310:25:003
16814872201,13sleep01681554-21irqstats09:15:130
1546735992017,1cyclictest0-21swapper/309:35:243
17333292191,4sleep01733533-21cat10:05:110
15629872191,5sleep01563491-21memory07:20:170
154673599192,11cyclictest1554444-21taskset07:15:103
1546735991917,1cyclictest0-21swapper/310:30:013
1546735991916,1cyclictest0-21swapper/310:59:593
1546735991916,1cyclictest0-21swapper/310:00:283
1546735991916,1cyclictest0-21swapper/307:40:223
1546735991916,1cyclictest0-21swapper/307:15:013
154673599191,14cyclictest0-21swapper/307:50:113
18801422181,12sleep21880175-21ntpq12:20:212
16544552180,2sleep00-21swapper/008:50:120
154673599188,6cyclictest1574791-21taskset07:31:263
154673599187,8cyclictest1738320-21turbostat10:14:543
154673599187,7cyclictest1717111-21taskset09:46:423
154673599182,11cyclictest1849348-21taskset11:55:123
1546735991816,1cyclictest0-21swapper/310:05:163
1546735991816,1cyclictest0-21swapper/308:35:173
1546735991815,1cyclictest0-21swapper/311:10:123
1546735991815,1cyclictest0-21swapper/309:45:003
1546735991815,1cyclictest0-21swapper/308:00:163
1546735991814,2cyclictest0-21swapper/309:15:153
154673599181,14cyclictest0-21swapper/309:20:233
154673599181,13cyclictest17704372sleep310:40:143
154673599181,12cyclictest0-21swapper/309:10:113
154673599181,12cyclictest0-21swapper/309:10:113
154673599181,11cyclictest1808687-21taskset11:15:153
154673599180,13cyclictest0-21swapper/308:25:133
154673599177,8cyclictest1559429-21turbostat07:24:553
154673599177,6cyclictest1796888-21taskset11:05:133
1546735991714,1cyclictest0-21swapper/311:45:283
1546735991714,1cyclictest0-21swapper/311:20:183
1546735991714,1cyclictest0-21swapper/308:45:003
1546735991711,3cyclictest0-21swapper/309:05:113
154673599171,12cyclictest1622477-21turbostat08:20:003
154673599171,10cyclictest1897090-21taskset12:40:013
154673599171,10cyclictest1720907-21taskset09:50:183
154673599170,12cyclictest0-21swapper/307:45:113
18581682161,10sleep11858698-21memory12:00:201
18533722161,10sleep01853426-21ntpq11:55:220
18231282161,10sleep01823386-21df_inode11:30:120
17481312166,2sleep1171rcu_preempt10:15:261
16372492161,9sleep01637296-21open_inodes08:30:240
15704112161,10sleep11570531-21tune2fs07:30:161
154673599165,8cyclictest1580496-21sleep07:40:003
154673599161,3cyclictest0-21swapper/310:35:113
1546735991613,1cyclictest0-21swapper/311:40:163
1546735991613,1cyclictest0-21swapper/308:10:163
154673599161,2cyclictest0-21swapper/308:50:113
154673599161,12cyclictest1696447-21turbostat09:30:013
154673599161,12cyclictest1638183-21turbostat08:35:003
154673599161,11cyclictest1886432-21turbostat12:30:003
154673599161,11cyclictest1849093-21sleep11:55:003
154673599161,10cyclictest1891547-21taskset12:34:043
154673599161,10cyclictest1664735-21taskset09:00:003
154673599160,13cyclictest0-21swapper/311:00:253
154673599160,13cyclictest0-21swapper/309:55:123
154673599160,13cyclictest0-21swapper/307:55:183
16747992151,9sleep21674875-21awk09:05:252
16705482151,9sleep11670761-21/usr/sbin/munin09:05:111
154673599151,8cyclictest1775601-21taskset10:45:013
1546735991512,1cyclictest0-21swapper/312:20:153
1546735991512,1cyclictest0-21swapper/312:10:213
1546735991512,1cyclictest0-21swapper/309:05:003
1546735991512,1cyclictest0-21swapper/308:20:253
154673599151,12cyclictest0-21swapper/310:50:233
154673599151,10cyclictest1872175-21taskset12:15:163
154673599151,10cyclictest1872175-21taskset12:15:153
154673599150,12cyclictest0-21swapper/312:00:203
154673599150,12cyclictest0-21swapper/311:25:213
18959132141,9sleep11895967-21ld12:35:231
18693492141,8sleep21869387-21ntpq12:10:232
18437342141,8sleep0800-21snmpd11:48:570
18113612141,8sleep01807038-21/usr/sbin/munin11:15:260
154673599141,9cyclictest1566658-21chrt07:25:163
1546735991412,1cyclictest0-21swapper/309:30:233
17228622131,7sleep21722881-21apt-get09:55:122
16972692131,8sleep21698586-21cut09:30:172
16182672131,8sleep01619886-21cut08:15:170
15867662131,8sleep11588362-21grep07:45:161
15698602131,8sleep11569967-21cut07:30:011
15472032131,4sleep21547360-21gltestperf07:10:142
154673599131,8cyclictest1607394-21taskset08:05:133
18351882121,6sleep01836921-21kthreadcore11:40:190
16486792121,7sleep21648963-21latency_hist08:45:002
16014392121,6sleep21601460-21munin-run08:00:002
15636292121,5sleep21563661-21ntpq07:20:202
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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