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2026-03-19 - 18:30

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 Mar 19, 2026 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32363224372192,98sleep00-21swapper07:08:300
325779916220,23cyclictest924-21munin-node07:15:120
325779916214,123cyclictest18089-21apt-get12:10:110
325779916131,21cyclictest19817-21apt-config09:10:080
325779916118,119cyclictest4027-21apt-get07:36:010
325779916114,124cyclictest5792-21memory10:56:200
325779916111,110cyclictest29844-21sh10:10:000
32577991609,108cyclictest11907-21apt-get11:36:490
325779916014,39cyclictest30995-21apt-get10:15:340
325779915944,92cyclictest8097-21/usr/sbin/munin11:10:250
325779915718,117cyclictest29962-21/usr/sbin/munin10:10:410
325779915716,24cyclictest18137-21munin-run09:00:020
325779915715,119cyclictest10418-21apt-get11:25:170
325779915613,119cyclictest11606-21apt-get08:20:170
325779915517,24cyclictest9503-21munin-run11:20:030
325779915516,116cyclictest13757-21apt-get11:46:260
325779915515,116cyclictest13757-21apt11:45:010
325779915511,119cyclictest9178-21/usr/sbin/munin08:06:080
325779915510,123cyclictest21704-21/usr/sbin/munin09:20:470
325779915418,47cyclictest16597-21df12:00:240
325779915415,24cyclictest13889-21apt-get08:36:170
325779915414,21cyclictest32679-21apt-get10:25:360
325779915412,118cyclictest19875-21apt-get09:10:280
325779915410,121cyclictest23025-21sendmail12:40:010
32577991539,25cyclictest20410-21apt-get12:26:480
325779915333,35cyclictest20879-21sshd09:15:180
325779915317,113cyclictest22500-21apt-get09:25:170
325779915315,24cyclictest17334-21munin-run08:55:030
325779915314,28cyclictest6411-21sshd11:00:180
325779915314,23cyclictest9041-21users08:01:040
325779915224,36cyclictest1351-21sshd10:30:170
325779915221,29cyclictest8219-21users07:56:070
325779915221,29cyclictest3445-21diskstats07:30:310
325779915221,106cyclictest28234-21diskstats10:00:360
325779915219,25cyclictest7311-21diskstats11:05:310
325779915219,107cyclictest6880-21diskstats07:50:340
325779915211,117cyclictest27191-21modprobe09:55:010
325779915113,116cyclictest20410-21apt12:25:000
325779915112,112cyclictest15442-21grep11:51:070
325779915111,40cyclictest19591-21latency_hist12:20:010
325779915017,28cyclictest24089-21apt-get09:35:160
325779915017,107cyclictest25820-21diskstats09:45:350
325779915016,107cyclictest24913-21apt-get09:40:190
325779915015,93cyclictest3475-21wc10:40:570
325779915015,36cyclictest3759-21apt-get10:45:180
325779915015,22cyclictest1166-21irqstats07:15:300
325779915014,113cyclictest17293-21apt-get12:05:180
325779915012,101cyclictest111-21systemd-journal07:40:190
325779915011,97cyclictest2039-21ntp_kernel_pll_07:20:550
32577991499,26cyclictest2751-21grep10:36:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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