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2025-11-22 - 04:12

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 Sat Nov 22, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24272224362201,96sleep00-21swapper19:08:030
245389916215,26cyclictest8397-21ntp_states20:45:510
245389916213,104cyclictest6528-21cstates20:35:250
245389916015,121cyclictest3079-21apt-get20:15:320
245389915941,22cyclictest32132-21sshd19:53:210
245389915932,107cyclictest6301-21apt-get23:56:350
245389915911,26cyclictest23484-21systemctl22:20:020
245389915814,120cyclictest18429-21apt-get21:51:270
24538991579,26cyclictest4070-21sshd23:40:240
245389915713,121cyclictest26704-21systemctl22:40:010
245389915613,119cyclictest7386-21df20:40:250
245389915613,118cyclictest10916-21memory00:20:430
245389915520,110cyclictest29913-21munin-run23:00:040
245389915511,119cyclictest6301-21apt-get23:55:010
245389915412,25cyclictest2462-21cstates23:30:230
245389915343,89cyclictest21239-21/usr/sbin/munin22:05:220
245389915343,22cyclictest32026-21processes23:10:580
245389915314,25cyclictest11372-21wc21:05:230
245389915238,94cyclictest13584-21sshd21:19:440
245389915214,22cyclictest18431-21munin-run21:50:030
245389915214,114cyclictest32527-21df23:15:240
245389915139,90cyclictest14356-21unixbench_singl21:21:030
245389915131,19cyclictest4438-21grep20:21:030
245389915124,107cyclictest12092-21apt-get21:10:140
245389915119,105cyclictest4983-21diskstats20:25:340
245389915115,27cyclictest1415-21/usr/sbin/munin20:05:360
245389915114,113cyclictest16819-21munin-run21:40:020
245389915017,109cyclictest21972-21/usr/sbin/munin22:10:580
245389915016,25cyclictest25845-21cstates19:15:410
245389915014,25cyclictest9946-21df00:15:270
245389915014,113cyclictest9574-21apt20:55:010
245389915011,117cyclictest24836-21find22:25:550
245389915011,116cyclictest31443-21grep23:06:010
245389915011,116cyclictest30715-21/usr/sbin/munin19:45:210
24538991499,116cyclictest29103-21modprobe22:55:000
245389914915,23cyclictest10374-21apt21:00:010
245389914914,27cyclictest1023-21latency23:20:410
245389914912,113cyclictest28194-21apt-get19:30:210
24538991489,115cyclictest7895-21awk00:01:040
245389914840,24cyclictest29293-21/usr/sbin/munin19:35:440
245389914821,28cyclictest27509-21diskstats19:25:340
245389914814,111cyclictest25301-21df22:30:260
24538991477,117cyclictest924-21awk20:00:510
245389914716,105cyclictest20381-21/usr/sbin/munin22:00:250
245389914714,113cyclictest25331-21munin-run19:15:030
245389914713,112cyclictest15685-21wc21:30:560
245389914712,27cyclictest27871-21wc22:45:470
24538991469,112cyclictest8882-21head00:06:030
245389914640,22cyclictest26759-21/usr/sbin/munin19:20:400
245389914639,86cyclictest13530-21mailstats00:35:570
245389914619,25cyclictest9049-21apt-get00:10:160
245389914618,28cyclictest3192-21apt-get23:35:210
245389914618,102cyclictest11645-21irqstats00:25:370
245389914614,106cyclictest26937-21diskstats22:40:340
245389914613,36cyclictest12566-21awk00:30:490
245389914613,112cyclictest4911-21sshd23:45:240
245389914517,23cyclictest19669-21df_inode21:55:390
245389914516,105cyclictest2322-21df_inode20:10:280
245389914515,25cyclictest23964-21/usr/sbin/munin22:20:520
245389914510,39cyclictest14727-21cat21:25:420
245389914420,29cyclictest32250-21/usr/sbin/munin19:56:070
245389914416,25cyclictest29975-21diskstats19:40:380
245389914319,100cyclictest2294-21munin-run23:30:000
245389914315,22cyclictest30693-21users23:01:060
245389914312,25cyclictest17097-21if_eth021:40:360
245389914311,108cyclictest5664-21/usr/sbin/munin20:30:430
245389914218,99cyclictest10674-21irqstats21:00:400
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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