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2026-03-13 - 20:46

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 Fri Mar 13, 2026 12:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7576223942161,179sleep00-21swapper07:08:390
77709916415,123cyclictest28655-21users12:31:040
77709916119,119cyclictest9783-21apt-get10:41:140
77709916114,120cyclictest26663-21/usr/sbin/munin09:00:530
77709916015,26cyclictest23988-21apt-get12:05:150
77709915916,119cyclictest13219-21apt11:00:010
77709915813,105cyclictest21964-21apt-get08:36:330
77709915716,95cyclictest6580-21munin-run10:20:020
77709915617,114cyclictest12110-21apt-get07:37:020
77709915520,26cyclictest28794-21apt-get12:35:160
77709915519,109cyclictest16786-21apt-get11:20:160
77709915510,103cyclictest13961-21munin-plugin-st07:45:010
77709915414,26cyclictest8931-21sendmail_mailtr07:15:220
77709915414,24cyclictest3363-21munin-run10:00:020
77709915413,102cyclictest15650-21cut11:12:000
77709915377,36cyclictest18481-21find08:10:550
77709915312,115cyclictest19987-21/usr/sbin/munin11:40:450
77709915311,98cyclictest8289-21/usr/sbin/munin10:30:220
77709915239,23cyclictest5574-21swap10:10:570
77709915219,25cyclictest20479-21apt-get08:25:140
77709915217,111cyclictest3580-21df10:00:210
77709915214,114cyclictest7346-21unixbench_singl10:21:020
77709915213,114cyclictest21408-21head11:46:050
77709915212,98cyclictest26190-21sh09:00:020
7770991519,116cyclictest23817-21latency_hist08:45:030
7770991519,101cyclictest5790-21snmpd11:35:550
77709915129,23cyclictest14119-21latency_hist11:05:050
77709915118,22cyclictest8574-21munin-node07:15:040
77709915115,36cyclictest22471-21df11:55:250
77709915115,113cyclictest16666-21munin-run11:20:020
77709915112,27cyclictest10690-21cstates07:25:230
77709915112,114cyclictest9611-21ls10:35:590
77709915111,25cyclictest12348-21grep10:51:010
77709915022,100cyclictest26407-21apt-get12:20:190
77709915018,26cyclictest17819-21memory11:25:430
77709915015,24cyclictest21578-21apt-get11:50:200
77709915014,111cyclictest14928-21/usr/sbin/munin07:50:220
77709915012,25cyclictest25270-21cut12:10:580
77709915012,24cyclictest17325-21/usr/sbin/munin08:05:210
77709915011,25cyclictest110-21systemd-journal07:59:220
7770991499,117cyclictest5790-21snmpd07:30:550
77709914931,94cyclictest4344-21cstates10:05:220
77709914918,24cyclictest27110-21apt-get09:05:160
77709914916,108cyclictest26283-21apt12:20:010
77709914913,26cyclictest18999-21sed11:31:020
77709914913,23cyclictest30741-21gzip09:25:540
77709914913,112cyclictest23758-21sort12:01:010
77709914913,110cyclictest14133-21/usr/sbin/munin11:05:520
77709914910,117cyclictest20378-21munin-plugin-st08:25:010
77709914910,112cyclictest31967-21cpuspeed09:35:190
77709914819,30cyclictest24814-21diskstats08:50:320
77709914813,110cyclictest14065-21/usr/sbin/munin07:45:200
77709914812,117cyclictest12285-21kworker/u2:808:00:120
77709914720,99cyclictest23910-21apt-get08:45:210
77709914715,35cyclictest31740-21unixbench_singl09:31:010
77709914714,27cyclictest7595-21df10:25:260
77709914714,23cyclictest30223-21apt09:25:010
77709914621,27cyclictest9928-21df07:20:240
77709914617,25cyclictest1979-21/usr/sbin/munin09:50:320
77709914614,107cyclictest27379-21irqstats12:25:390
77709914612,113cyclictest21573-21ntpq08:30:470
77709914531,33cyclictest19269-21zcat08:15:570
77709914517,27cyclictest10936-21apt-get10:45:280
77709914515,25cyclictest28024-21/usr/sbin/munin09:10:330
77709914512,23cyclictest29344-21grep09:16:030
77709914511,111cyclictest1374-21grep09:45:500
77709914215,102cyclictest372-21df09:40:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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