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2026-06-28 - 20:02

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 Sun Jun 28, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16524224352193,98sleep00-21swapper07:09:180
166489916012,124cyclictest19081-21wc07:20:540
166489915917,118cyclictest27995-21memory08:15:420
166489915912,121cyclictest28462-21apt-get08:21:420
166489915828,21cyclictest20823-1kworker/u3:407:35:190
166489915816,118cyclictest27056-21df08:10:260
166489915816,118cyclictest24770-21apt-get11:15:340
166489915715,117cyclictest23056-21df07:45:260
166489915616,115cyclictest4464-21df09:10:270
166489915615,97cyclictest28419-21df11:35:250
166489915615,115cyclictest2892-21/usr/sbin/munin09:00:360
166489915613,119cyclictest12393-21cat10:00:060
166489915610,122cyclictest16933-21ntpq10:26:300
166489915513,117cyclictest8677-21tr09:35:480
166489915513,117cyclictest27093-21grep11:25:540
166489915438,21cyclictest7106-21ntp_states09:25:510
166489915422,27cyclictest25479-21diskstats08:00:340
166489915420,29cyclictest24182-21df_inode11:10:300
166489915418,25cyclictest5871-21munin-run09:20:020
166489915415,114cyclictest17458-21munin-node07:15:060
166489915314,115cyclictest17357-21apt-get10:31:260
166489915313,117cyclictest10371-21grep09:45:540
166489915312,98cyclictest20202-21apt-get07:31:480
166489915216,27cyclictest20869-21apt-get10:50:160
166489915215,24cyclictest31903-21munin-run08:40:030
166489915212,24cyclictest31524-21/usr/sbin/munin11:55:330
16648991519,24cyclictest29977-21grep08:26:010
166489915119,31cyclictest29253-21diskstats11:40:330
166489915116,24cyclictest6434-21munin-run12:40:030
166489915116,111cyclictest13904-21munin-run10:10:010
166489915113,38cyclictest25242-21apt08:00:010
16648991509,117cyclictest11548-21date09:55:040
166489915035,17cyclictest0-21swapper11:00:490
166489915030,103cyclictest23921-21head11:06:040
166489915016,109cyclictest12525-21diskstats10:00:330
166489915015,23cyclictest5399-21munin-run12:35:040
166489915015,22cyclictest2499-21sort08:56:020
166489915015,113cyclictest6647-21users09:21:030
166489915013,113cyclictest1998-21sort12:11:000
166489915012,99cyclictest9899-21latency_hist09:45:010
166489915012,35cyclictest21764-21df_inode10:55:260
166489915012,23cyclictest19681-21irqstats07:25:390
166489915010,118cyclictest14699-21munin-run10:15:010
16648991498,116cyclictest1309-21sed12:06:020
166489914920,29cyclictest18458-21apt-get10:35:290
166489914917,27cyclictest15730-21df10:20:250
166489914915,24cyclictest1395-21memory08:50:410
166489914913,112cyclictest32247-21sort08:40:430
166489914913,108cyclictest32346-21/usr/sbin/munin12:00:430
166489914912,115cyclictest2644-21wc12:15:520
16648991489,26cyclictest17752-21cstates07:15:200
16648991489,21cyclictest984-21unixbench_singl08:46:040
166489914817,29cyclictest22269-21diskstats07:40:330
166489914814,48cyclictest23855-21/usr/sbin/munin07:50:270
166489914812,19cyclictest26174-21memory11:20:510
166489914811,28cyclictest29984-21grep11:45:220
166489914810,49cyclictest27763-21memory11:30:450
16648991479,112cyclictest8223-21grep09:31:000
166489914721,28cyclictest3112-21apt-get12:20:180
166489914713,112cyclictest19889-21head10:41:020
166489914713,108cyclictest3934-21grep09:05:540
166489914711,112cyclictest14911-21/usr/sbin/munin10:15:330
166489914618,24cyclictest20176-21df10:45:270
166489914617,22cyclictest30902-21irqstats11:50:360
166489914315,24cyclictest4006-21df12:25:250
166489914314,26cyclictest30402-21apt-get08:30:150
166489914310,26cyclictest26728-21ls08:06:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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