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2026-04-10 - 23:51

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 Apr 10, 2026 12:45:10)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28692224422194,89sleep00-21swapper07:06:430
291049916116,122cyclictest25671-21apt-get10:05:230
291049915918,115cyclictest21311-21apt-get09:37:000
291049915815,102cyclictest3575-21apt-get07:50:270
291049915811,120cyclictest31385-21apt-get10:41:530
291049915617,39cyclictest29911-21munin-node07:15:070
29104991558,123cyclictest111-21systemd-journal08:42:140
291049915511,123cyclictest15187-21kworker/u2:1412:16:540
291049915432,99cyclictest27709-21missed_timers10:15:440
291049915417,113cyclictest14865-21munin-run09:00:040
291049915414,98cyclictest23129-21apt09:50:010
291049915410,42cyclictest31422-21gpgv10:40:060
291049915319,29cyclictest13206-21memory12:05:420
291049915314,97cyclictest4534-21apt-get07:55:130
291049915314,40cyclictest11346-21/usr/sbin/munin11:55:080
291049915312,23cyclictest20500-21latency_hist09:35:060
291049915312,116cyclictest2513-21sort07:41:010
291049915311,27cyclictest3405-21apt-get07:50:050
291049915311,118cyclictest2473-21grep11:00:060
291049915311,103cyclictest6275-21/usr/sbin/munin08:05:350
291049915230,22cyclictest12169-21/usr/sbin/munin12:01:100
291049915217,110cyclictest5355-21apt-get08:00:130
291049915215,26cyclictest10159-21/usr/sbin/munin08:30:480
291049915215,113cyclictest29889-21apt-get10:30:160
291049915214,40cyclictest31860-21munin-run07:25:010
291049915210,26cyclictest11579-21grep08:36:020
29104991519,118cyclictest18596-21sort12:36:020
291049915116,98cyclictest272-21snmpd09:29:130
291049915113,25cyclictest14046-21tr12:10:480
291049915112,115cyclictest8102-21ps08:15:550
291049915110,25cyclictest24670-21head09:56:030
29104991509,27cyclictest1786-21sh07:40:020
291049915035,23cyclictest26821-21if_eth010:10:420
291049915023,100cyclictest540-21memory07:30:430
291049915020,101cyclictest873-21apt-get10:50:200
291049915014,26cyclictest32539-21sshd10:45:150
291049915014,25cyclictest15093-21df_inode09:00:290
291049915014,113cyclictest18084-21munin-run09:20:030
291049915010,116cyclictest6773-21grep11:25:430
29104991499,26cyclictest7539-21ls08:11:010
291049914920,26cyclictest21754-21diskstats09:40:400
291049914918,23cyclictest2733-21memory11:00:450
291049914916,90cyclictest29090-21/usr/sbin/munin10:25:230
291049914916,21cyclictest17107-21munin-run12:30:010
291049914916,106cyclictest8677-21sh08:20:290
291049914910,114cyclictest30937-21/usr/sbin/munin07:16:190
291049914832,23cyclictest9226-21missed_timers11:40:440
291049914820,103cyclictest13529-21/usr/sbin/munin08:50:370
291049914819,100cyclictest23232-21apt-get09:50:200
291049914817,26cyclictest5758-21apt-get11:20:110
291049914817,23cyclictest5053-21irqstats11:15:390
291049914817,105cyclictest28296-21apt-get10:20:170
291049914814,112cyclictest15621-21apt-get12:20:220
291049914814,109cyclictest4254-21irqstats11:10:390
291049914813,23cyclictest3906-21grep11:06:040
291049914811,97cyclictest8032-21modprobe11:35:000
291049914717,23cyclictest16675-21df09:10:230
291049914716,20cyclictest18306-21df09:20:260
291049914712,112cyclictest9755-21/usr/sbin/munin11:45:540
291049914711,110cyclictest10552-21munin-node11:50:100
291049914618,23cyclictest24848-21apt-get10:00:200
291049914617,25cyclictest8313-21irqstats11:35:400
291049914614,25cyclictest12686-21diskstats08:45:320
291049914612,22cyclictest17205-21/usr/sbin/munin12:30:580
291049914610,25cyclictest16060-21ntp_kernel_err09:05:470
291049914512,112cyclictest32556-21sort07:26:020
291049914412,27cyclictest10022-21users08:26:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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