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2026-09-17 - 13:17

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 Sep 17, 2026 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7382224482197,97sleep00-21swapper19:08:400
75749916542,21cyclictest19683-21processes20:20:550
75749916514,129cyclictest14921-21apt-get19:56:250
75749916121,112cyclictest24959-21apt-get20:55:250
75749916118,25cyclictest8378-21munin-node19:15:070
75749916028,112cyclictest18193-21wc20:10:590
75749916016,24cyclictest25220-21ntp_states00:10:510
75749916011,121cyclictest22163-21apt-get23:56:420
75749915816,99cyclictest15836-21apt-get23:15:200
75749915815,25cyclictest26411-21apt00:20:010
75749915814,119cyclictest3460-21munin-run22:00:010
75749915812,122cyclictest27426-21munin-plugin-st21:10:010
75749915731,102cyclictest12279-21apt-get19:40:350
75749915716,115cyclictest29026-21df00:35:260
75749915714,120cyclictest3456-21apt-get22:01:210
75749915610,121cyclictest20586-21wc23:45:030
75749915516,114cyclictest6089-21munin-run22:15:020
75749915512,42cyclictest1112-21uname21:45:390
75749915512,119cyclictest22684-21uname20:40:400
75749915512,102cyclictest24474-21ps00:05:570
75749915421,105cyclictest16190-21diskstats20:00:410
75749915420,25cyclictest29155-21apt-get21:20:180
75749915415,98cyclictest8584-21diskstats19:15:230
75749915329,19cyclictest0-21swapper21:25:360
75749915319,37cyclictest7135-21df_inode22:20:310
75749915312,117cyclictest18734-21tr23:30:590
75749915312,114cyclictest32473-21apt21:40:010
75749915311,27cyclictest27405-21/usr/sbin/munin00:25:230
75749915311,25cyclictest19345-21awk23:35:480
7574991529,96cyclictest30644-21apt-get21:31:410
75749915217,112cyclictest16882-21snmpd22:15:270
75749915216,97cyclictest10338-21df22:40:230
75749915214,100cyclictest14923-21munin-run19:55:050
75749915213,114cyclictest12273-21modprobe19:40:010
75749915212,22cyclictest16874-21apt-get20:05:200
75749915210,24cyclictest20634-21grep20:26:000
75749915210,120cyclictest17282-21unixbench_singl23:21:000
75749915119,28cyclictest1747-21apt-get21:50:270
75749915114,111cyclictest18463-21apt-get20:15:220
75749915110,117cyclictest13380-21wc23:00:050
7574991509,118cyclictest13907-21cut23:00:590
75749915030,23cyclictest7931-21df22:25:280
75749915014,110cyclictest14244-21/usr/sbin/munin23:05:460
75749915012,39cyclictest15252-21sort23:10:430
75749915010,54cyclictest13579-21/usr/sbin/munin19:45:440
75749915010,100cyclictest9885-21modprobe19:25:010
7574991499,118cyclictest24171-21wc20:50:240
75749914921,100cyclictest17465-21apt-get23:25:200
75749914919,104cyclictest4602-21apt-get22:05:120
75749914915,108cyclictest25941-21apt-get21:00:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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