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2026-06-22 - 04:07

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 highest latencies:
System rack5slot7s.osadl.org (updated Mon Jun 22, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7553224302199,87sleep00-21swapper19:07:540
78359916416,123cyclictest8645-21munin-node19:15:080
78359916014,104cyclictest20118-21apt-get23:45:310
78359915916,116cyclictest17636-21/usr/sbin/munin23:31:010
78359915915,120cyclictest25414-21munin-run00:15:030
78359915817,101cyclictest23619-21apt-get00:06:260
78359915816,116cyclictest19496-21memory23:40:420
78359915717,23cyclictest22713-21apt-get00:00:300
78359915533,23cyclictest13522-21forks23:05:350
78359915515,115cyclictest25800-21tr21:00:470
78359915513,25cyclictest11448-21mailstats22:51:050
78359915510,121cyclictest31839-21cut21:35:590
7835991549,121cyclictest21752-21sshd23:52:120
78359915427,18cyclictest0-21swapper23:55:570
78359915420,25cyclictest12842-21memory23:00:440
78359915419,110cyclictest23338-21memory20:45:420
78359915417,23cyclictest3015-21df22:00:240
78359915416,37cyclictest7039-21df_inode22:25:290
78359915413,117cyclictest18864-21/usr/sbin/munin23:35:560
78359915411,116cyclictest29430-21sh00:40:000
78359915411,115cyclictest28665-21latency_hist00:35:030
78359915320,106cyclictest14261-21apt-get19:50:180
78359915316,115cyclictest24960-21sort20:55:470
78359915315,27cyclictest21651-21irqstats20:35:360
78359915315,23cyclictest26347-21apt-get00:20:120
78359915313,116cyclictest26136-21grep00:16:010
78359915310,119cyclictest9563-21df19:20:330
7835991529,43cyclictest21105-21find20:30:580
78359915218,111cyclictest17366-21munin-run20:10:010
78359915217,109cyclictest2098-21apt-get21:55:160
78359915215,115cyclictest8645-21munin-node19:15:140
78359915215,114cyclictest28606-21apt-get21:21:300
78359915214,113cyclictest4618-21diskstats22:10:340
78359915212,25cyclictest11484-21sendmail_mailst19:30:550
78359915126,104cyclictest15860-21latency_hist20:00:060
78359915122,28cyclictest23891-21apt-get20:50:200
78359915115,112cyclictest3821-21df_inode22:05:300
78359915114,38cyclictest6016-21munin-run22:20:030
78359915113,100cyclictest14090-21apt-get23:10:550
78359915110,117cyclictest12517-21sshd19:36:240
78359915037,92cyclictest27837-21latency_hist21:15:030
78359915034,23cyclictest18800-21timerandwakeup20:16:000
78359915015,96cyclictest1203-21munin-run21:50:000
78359915014,113cyclictest29757-21/usr/sbin/munin21:25:530
78359915014,113cyclictest16630-21sort23:21:020
78359915013,24cyclictest11778-21apt-get22:55:180
78359915010,24cyclictest16842-21munin-node23:25:100
7835991499,118cyclictest22662-21grep20:40:530
78359914921,27cyclictest8430-21users22:31:060
78359914913,27cyclictest19090-21/usr/sbin/munin20:20:460
78359914913,24cyclictest32266-21df21:40:260
78359914913,22cyclictest28611-21munin-run21:20:070
78359914913,22cyclictest14098-21sed19:46:040
78359914911,115cyclictest16498-21unixbench_singl20:01:030
78359914910,116cyclictest10787-21sort22:46:010
78359914818,23cyclictest26409-21df21:05:270
78359914818,103cyclictest1303-21apt-get21:50:180
78359914817,106cyclictest30649-21df21:30:250
78359914811,26cyclictest17885-21sendmail_mailqu20:10:550
7835991479,26cyclictest9135-21ls22:36:040
78359914735,18cyclictest0-21swapper00:29:030
78359914729,96cyclictest0-21swapper23:20:010
78359914610,25cyclictest6824-21modprobe22:25:000
78359914610,115cyclictest9493-21df22:40:250
78359914517,26cyclictest20542-21users20:26:070
78359914513,30cyclictest12948-21/usr/sbin/munin19:40:470
7835991439,22cyclictest10441-21uname19:25:410
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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