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2026-07-23 - 17:10

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 792 highest latencies:
System rack5slot7s.osadl.org (updated Thu Jul 23, 2026 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25945224552213,98sleep00-21swapper07:09:580
259939916316,120cyclictest30634-21apt-get10:55:220
259939916213,42cyclictest31958-21apt-get07:46:560
259939916112,124cyclictest15479-21grep12:35:510
259939915920,116cyclictest4915-21apt-get11:36:160
259939915912,28cyclictest3817-21grep11:26:400
259939915818,117cyclictest2885-21sed08:01:020
259939915716,102cyclictest8352-21apt-get11:56:140
259939915615,117cyclictest9508-21apt-get12:00:240
259939915517,24cyclictest11986-21munin-run09:00:020
259939915516,100cyclictest14392-21munin-run09:15:010
259939915513,51cyclictest3038-21/usr/sbin/munin08:05:510
259939915513,119cyclictest29258-21sort10:45:460
259939915512,27cyclictest17225-21grep09:30:500
25993991549,122cyclictest25052-21wc10:20:210
259939915417,28cyclictest30479-21/usr/sbin/munin10:55:050
259939915417,23cyclictest7756-21df11:50:260
259939915416,23cyclictest3095-21munin-run11:25:010
259939915411,119cyclictest11232-21wc08:55:040
259939915322,29cyclictest13012-21diskstats09:05:330
259939915316,94cyclictest26894-21munin-node07:45:050
259939915314,114cyclictest29646-21apt-get07:30:120
259939915314,113cyclictest20921-21/usr/sbin/munin09:55:550
259939915313,26cyclictest18141-21find09:35:560
259939915310,120cyclictest20132-21dpkg09:50:140
259939915220,106cyclictest11208-21diskstats12:10:350
259939915217,24cyclictest6169-21df11:40:340
259939915215,24cyclictest8551-21munin-run08:40:020
259939915136,93cyclictest16176-21cpu09:25:230
259939915117,25cyclictest30539-21df07:35:250
259939915115,37cyclictest11991-21df12:15:260
259939915111,117cyclictest10766-21mailstats12:06:010
259939915111,100cyclictest18828-21grep09:40:480
259939915040,89cyclictest22491-21latency_hist10:05:030
259939915032,19cyclictest6509-21grep08:25:460
259939915022,29cyclictest26200-21diskstats07:10:330
259939915017,28cyclictest12216-21diskstats09:00:350
259939915017,26cyclictest4628-21/usr/sbin/munin08:15:350
259939915017,24cyclictest15500-21irqstats09:20:380
259939915016,111cyclictest3933-21df08:10:260
259939915015,112cyclictest19431-21df09:45:250
259939915014,22cyclictest32527-21df11:05:260
259939915014,111cyclictest4224-21apt-get11:30:260
259939915011,24cyclictest27659-21awk07:16:150
259939914921,25cyclictest22656-21diskstats10:05:310
259939914918,24cyclictest631-21apt-get07:50:250
259939914916,24cyclictest12823-21df12:20:250
259939914915,110cyclictest28071-21munin-run10:40:020
259939914912,23cyclictest15077-21sort12:35:030
259939914911,28cyclictest2116-21timerandwakeup11:16:010
259939914911,27cyclictest9381-21sort08:45:040
259939914813,109cyclictest31635-21/usr/sbin/munin11:00:120
259939914812,27cyclictest6862-21/usr/sbin/munin11:45:350
259939914812,111cyclictest26305-21sort10:26:020
259939914810,112cyclictest1697-21nfs4_client07:55:500
25993991479,25cyclictest10224-21sed08:50:060
25993991479,23cyclictest24218-21cstates10:15:250
259939914714,110cyclictest7152-21df08:30:250
259939914634,92cyclictest23706-21proc_pri10:10:530
259939914616,108cyclictest28153-21df07:20:250
259939914610,115cyclictest6152-21modprobe08:25:000
259939914610,111cyclictest15204-21apt09:20:020
259939914532,93cyclictest27268-21munin-run10:35:000
259939914526,20cyclictest0-21swapper07:25:580
259939914515,21cyclictest0-21swapper10:40:470
259939914512,107cyclictest879-21diskstats11:10:310
259939914412,105cyclictest13519-21/usr/sbin/munin12:25:510
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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