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2026-06-25 - 10:55

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 50 highest latencies:
System rack5slot7s.osadl.org (updated Thu Jun 25, 2026 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17057224382203,97sleep00-21swapper19:07:450
173529916612,111cyclictest25130-21apt-get23:11:360
173529916511,106cyclictest27420-21/usr/sbin/munin20:11:000
173529916216,23cyclictest10363-21apt-get21:46:590
173529916113,122cyclictest20447-21sshd19:25:410
173529916015,124cyclictest22504-21munin-run19:40:020
173529915912,123cyclictest17902-21/usr/sbin/munin22:25:420
173529915816,37cyclictest20896-21apt22:45:010
173529915814,119cyclictest21002-21/usr/sbin/munin19:30:120
173529915813,121cyclictest32709-21apt-get23:55:240
173529915717,22cyclictest22657-21apt-get22:55:270
173529915715,46cyclictest6342-21munin-run21:20:020
173529915615,96cyclictest18158-21munin-node19:15:090
173529915613,23cyclictest9467-21grep21:36:020
173529915613,118cyclictest7589-21munin-run00:40:020
173529915517,26cyclictest20084-21munin-run22:40:010
173529915416,113cyclictest32261-21apt-get20:40:170
173529915414,42cyclictest29103-21fgrep23:30:560
173529915414,118cyclictest2886-21apt-get21:01:290
173529915414,114cyclictest11548-21apt-get21:50:340
173529915412,115cyclictest29048-21/usr/sbin/munin20:20:280
173529915323,102cyclictest25831-21apt-get20:00:200
173529915317,112cyclictest31882-21/usr/sbin/munin23:50:520
173529915316,114cyclictest1633-21memory20:50:420
173529915316,112cyclictest23280-21users19:41:060
173529915315,113cyclictest5132-21head00:21:030
173529915315,113cyclictest13337-21apt-get22:00:240
173529915313,27cyclictest28425-21/usr/sbin/munin23:25:590
173529915312,114cyclictest6459-21/usr/sbin/munin21:20:590
173529915310,118cyclictest26261-21/usr/sbin/munin23:15:410
173529915235,20cyclictest27175-21wc20:05:590
173529915217,29cyclictest23883-21memory23:00:500
173529915217,112cyclictest10365-21munin-run21:45:030
173529915215,114cyclictest16790-21apt22:20:110
173529915213,23cyclictest2864-21kworker/u2:1400:10:050
173529915130,16cyclictest0-21swapper00:31:020
173529915127,106cyclictest2701-21head00:06:020
173529915126,104cyclictest22494-21kworker/u2:600:00:190
173529915116,95cyclictest8288-21memory21:30:420
173529915116,37cyclictest20109-21apt19:25:010
173529915115,37cyclictest30179-21munin-run23:40:020
173529915114,96cyclictest25704-21sh20:00:010
17352991508,119cyclictest19215-21head22:31:020
173529915031,97cyclictest0-21swapper21:55:500
173529915016,26cyclictest30400-21df_inode23:40:270
173529915014,24cyclictest24075-21users19:46:060
173529915011,114cyclictest21791-21/usr/sbin/munin22:50:120
173529915010,100cyclictest2551-21grep20:55:510
173529914928,32cyclictest14345-21apt-get22:05:110
173529914919,101cyclictest27202-21diskstats23:20:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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