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2026-08-20 - 12:25

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, 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.

Total number of samples: 50.5 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 rack5slot7s.osadl.org (updated Thu Aug 20, 2026 00:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2293224622204,100sleep00-21swapper19:06:150
27619916818,123cyclictest22021-21apt-get21:07:000
27619916418,120cyclictest26267-21apt-get21:31:590
27619916218,117cyclictest23816-21apt-get00:30:280
27619916216,30cyclictest30930-21df21:55:280
27619916138,22cyclictest2700-21cpuspeed22:20:210
27619915918,117cyclictest13934-21diskstats20:16:020
27619915818,98cyclictest15793-21ntp_states20:25:520
27619915743,93cyclictest29811-21timerandwakeup21:47:020
27619915620,27cyclictest7209-21apt-get19:35:170
27619915616,24cyclictest17461-21irqstats23:51:140
27619915616,117cyclictest25470-21munin-run00:40:010
27619915615,101cyclictest19511-21apt-get20:50:240
27619915519,22cyclictest4640-21sed19:16:200
27619915516,115cyclictest12167-21munin-run23:20:020
27619915417,22cyclictest8128-21df19:40:250
27619915417,110cyclictest16294-21apt-get23:45:130
27619915414,23cyclictest27501-21df_inode21:35:380
27619915412,117cyclictest3386-21ls19:11:050
27619915410,27cyclictest22569-21grep00:20:560
27619915410,118cyclictest15959-21cut23:41:020
2761991539,122cyclictest11945-21ls20:05:030
27619915314,99cyclictest31672-21apt-get22:00:240
27619915311,120cyclictest1732-21cat22:15:040
27619915218,111cyclictest28455-21memory21:40:440
27619915216,24cyclictest22034-21munin-run00:20:030
27619915215,114cyclictest10526-21diskstats19:55:310
2761991519,117cyclictest16882-21snmpd20:30:570
27619915130,19cyclictest0-21swapper23:30:180
27619915119,25cyclictest26269-21munin-run21:30:040
27619915115,112cyclictest456-21memory22:05:500
27619915114,27cyclictest6756-21df22:45:280
27619915114,25cyclictest30274-21memory21:50:520
27619915114,116cyclictest19117-21find20:45:550
27619915111,115cyclictest3733-21awk22:25:480
27619915110,115cyclictest12646-21grep20:06:030
2761991509,25cyclictest25360-21sort21:21:040
2761991509,118cyclictest12607-21open_files23:20:520
27619915031,23cyclictest15378-21systemctl23:40:010
27619915021,102cyclictest7450-21apt-get22:50:210
27619915020,28cyclictest6511-21df19:30:230
27619915016,23cyclictest9962-21df23:05:250
27619915014,112cyclictest5913-21ntpq19:25:480
27619915013,113cyclictest8951-21munin-run23:00:020
27619915013,107cyclictest4820-21/usr/sbin/munin19:21:080
27619915012,22cyclictest18818-21munin-run00:00:010
27619915011,39cyclictest9320-21missed_timers23:00:450
27619915011,26cyclictest23399-21wc21:10:540
27619915010,115cyclictest13511-21find23:25:570
27619914921,100cyclictest19732-21apt-get00:05:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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