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2025-12-24 - 05:11

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #8, slot #4

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 rack8slot4s.osadl.org (updated Wed Dec 24, 2025 00:44:43)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16493262219185,22sleep70-21swapper/719:05:577
16495862218160,18sleep30-21swapper/319:09:383
16493812217190,17sleep60-21swapper/619:06:446
16495922213166,14sleep00-21swapper/019:09:440
16493422212178,22sleep50-21swapper/519:06:105
16493382211177,22sleep10-21swapper/119:06:071
16495372208178,19sleep20-21swapper/219:08:572
16493052204175,18sleep40-21swapper/419:05:374
16634622460,0sleep50-21swapper/519:30:135
164985599360,18cyclictest0-21swapper/722:32:247
164985599310,18cyclictest0-21swapper/723:27:197
164985599310,18cyclictest0-21swapper/723:16:217
164985599300,17cyclictest0-21swapper/722:54:227
164985599300,17cyclictest0-21swapper/722:21:267
164985599300,17cyclictest0-21swapper/721:26:317
164985599300,17cyclictest0-21swapper/721:15:317
164985599300,17cyclictest0-21swapper/720:31:367
164985599300,17cyclictest0-21swapper/719:58:387
164984499270,25cyclictest1703585-21apt-get20:40:013
164984499270,22cyclictest0-21swapper/322:00:003
164984499260,22cyclictest0-21swapper/322:25:123
164983899250,24cyclictest1656413-21latency_hist19:20:001
1649834992524,1cyclictest0-21swapper/023:25:000
164983499250,24cyclictest0-21swapper/023:50:120
1649855992422,1cyclictest1740863-21turbostat21:44:597
1649855992422,1cyclictest1653550-21munin-node19:15:017
164985599240,22cyclictest0-21swapper/700:05:007
164985599240,1cyclictest0-21swapper/722:25:017
164984999240,23cyclictest1718425-21apt-get21:05:135
164984499240,22cyclictest1801641-21cron23:30:013
164984299240,23cyclictest1813362-21awk23:50:012
164984299240,23cyclictest1813362-21awk23:50:002
164984299240,23cyclictest0-21swapper/222:05:142
1649838992421,2cyclictest1711804-21sh20:54:591
164983499240,23cyclictest1714867-21apt-get21:00:010
164985599230,22cyclictest0-21swapper/720:40:147
1649853992321,1cyclictest1789958-21apt-get23:10:016
164985399230,23cyclictest1810265-21awk23:45:016
1649849992321,1cyclictest0-21swapper/520:40:005
1649849992321,1cyclictest0-21swapper/519:15:025
164984999230,2cyclictest1725442-21ntpq21:15:185
164984999230,22cyclictest1839082-21apt00:35:015
164984999230,22cyclictest1750126-21apt-get22:00:135
164984999230,22cyclictest0-21swapper/521:40:005
1649844992320,3cyclictest0-21swapper/321:10:133
1649844992320,2cyclictest1726554-21apt21:20:003
1649844992319,3cyclictest1652923-21dpkg19:15:003
164984499230,22cyclictest1708915-21munin-run20:49:593
164984499230,22cyclictest0-21swapper/323:55:143
1649842992321,1cyclictest1821973-21awk00:05:002
1649842992321,1cyclictest1709332-21apt-get20:50:132
164984299230,22cyclictest0-21swapper/222:25:122
164984299230,1cyclictest0-21swapper/220:20:152
164983899230,23cyclictest0-21swapper/100:00:011
164983899230,22cyclictest0-21swapper/100:35:101
164983899230,1cyclictest1813377-21idleruntime-cro23:50:001
164983899230,1cyclictest1813377-21idleruntime-cro23:50:001
1649834992322,1cyclictest0-21swapper/019:15:010
1649834992320,2cyclictest1758270-21awk22:15:000
164983499230,22cyclictest0-21swapper/021:10:130
164983499230,22cyclictest0-21swapper/000:25:130
164983499230,22cyclictest0-21swapper/000:05:140
1649855992221,1cyclictest0-21swapper/722:10:007
1649855992219,2cyclictest1789978-21awk23:10:017
164985599220,21cyclictest0-21swapper/721:55:137
164985599220,21cyclictest0-21swapper/721:10:137
164985599220,21cyclictest0-21swapper/720:20:147
164985599220,21cyclictest0-21swapper/700:30:117
164985599220,1cyclictest1688637-21perf20:15:007
1649853992221,1cyclictest1767529-21apt-get22:30:126
1649853992220,1cyclictest0-21swapper/600:10:136
164985399220,21cyclictest1749678-21apt22:00:016
164985399220,21cyclictest0-21swapper/623:30:126
164985399220,21cyclictest0-21swapper/600:25:146
164985399220,21cyclictest0-21swapper/600:05:146
164985399220,0cyclictest0-21swapper/620:05:136
1649849992220,1cyclictest1833808-21apt-get00:25:145
164984999220,21cyclictest0-21swapper/523:25:105
164984999220,21cyclictest0-21swapper/521:10:145
164984999220,21cyclictest0-21swapper/520:55:105
164984999220,21cyclictest0-21swapper/520:15:145
164984999220,21cyclictest0-21swapper/520:05:125
164984999220,1cyclictest1804515-21munin-run23:35:005
164984999220,1cyclictest1733960-21ntpq21:30:195
1649847992220,2cyclictest1827683-21idleruntime-cro00:15:004
164984799220,22cyclictest1697235-21awk20:30:004
164984799220,21cyclictest1836659-21apt-get00:30:124
164984799220,21cyclictest0-21swapper/422:15:134
164984799220,0cyclictest0-21swapper/422:35:134
1649844992221,1cyclictest0-21swapper/322:50:003
1649844992220,1cyclictest1821957-21munin-run00:05:003
1649844992219,1cyclictest0-21swapper/319:15:013
164984499220,21cyclictest0-21swapper/323:05:113
164984499220,21cyclictest0-21swapper/322:15:133
164984499220,21cyclictest0-21swapper/320:00:133
164984499220,21cyclictest0-21swapper/319:40:113
164984499220,1cyclictest1828078-21apt-get00:15:113
164984499220,1cyclictest1793498-21apt-get23:15:123
164984499220,1cyclictest1697643-21apt-get20:30:133
1649842992220,1cyclictest1770382-21apt-get22:35:142
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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