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2026-09-23 - 00:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of all highest latencies:
System rack4slot6s.osadl.org (updated Tue Sep 22, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1900522430,2sleep019007-21idleruntime-cro09:24:590
2433021420,3sleep024332-21munin-plugin-st07:40:010
1031921340,3chrt9879-21/usr/sbin/munin10:55:250
338421210,3chrt3387-21sort12:35:140
3198721180,4chrt31986-21fw_packets12:20:130
2063821180,4chrt20637-21systemctl11:35:260
2845821130,4sleep028162-21/usr/sbin/munin10:00:230
527221120,4chrt5274-21wc10:35:270
638521030,3sleep06445-21grep08:35:190
24862990,4sleep02519-21sed08:20:160
192192990,3sleep019270-21/usr/sbin/munin09:25:150
23572925,10sleep02422-21/usr/sbin/munin12:30:250
126622920,4sleep012707-21/usr/sbin/munin09:00:120
215832914,12sleep021634-21cut09:35:020
229042884,10sleep022913-21df11:45:140
41442875,9sleep04216-21users08:25:280
114162870,2sleep011352-21/usr/sbin/munin08:55:160
12402850,2sleep01241-21cat12:25:270
307652826,64sleep030774-21memory12:15:180
299062820,3sleep029909-21tr10:05:260
219312820,3sleep021929-21grep11:40:250
220692815,61sleep022122-21netstat07:30:190
269032790,4sleep026933-21ls07:50:010
261092765,56sleep026166-21users09:50:320
208332734,58sleep020868-21ntpq07:25:210
84392686,50sleep0288-21snmpd08:43:150
16613996229,23cyclictest27144-21/usr/sbin/munin07:50:150
16613996135,16cyclictest16621-21/usr/sbin/munin11:20:200
1570626114,27sleep015751-21proc_pri07:05:230
1661399609,18cyclictest23289-21seq09:40:200
16613996035,15cyclictest11334-21/usr/sbin/munin11:00:160
16613996022,12cyclictest14269-21switchtime11:10:260
16613996019,13cyclictest22855-21modprobe09:40:000
16613996011,16cyclictest6322-21ntp_states10:40:210
16613996011,16cyclictest25481-21df_inode11:55:140
1661399599,15cyclictest18284-21ntp_states07:15:240
1661399598,18cyclictest26855-21/usr/sbin/munin09:55:260
16613995912,17cyclictest24526-21df_inode07:40:110
16613995910,18cyclictest8449-21sshd10:49:540
1661399588,23cyclictest10071-21/usr/sbin/munin08:50:300
1661399588,15cyclictest24289-21/usr/sbin/munin09:45:280
1661399586,19cyclictest15246-21/usr/sbin/munin09:10:150
16613995834,16cyclictest29858-21/usr/sbin/munin12:10:280
1661399579,16cyclictest28383-21df_inode07:55:150
1661399578,18cyclictest28298-21awk12:05:210
1661399578,15cyclictest2159-21/usr/sbin/munin10:25:200
1661399577,16cyclictest29634-21/usr/sbin/munin08:00:150
16613995734,14cyclictest12628-21/usr/sbin/munin11:05:170
16613995733,16cyclictest9310-21runrttasks10:51:210
16613995712,16cyclictest19314-21/usr/sbin/munin07:20:300
16613995710,16cyclictest3595-21irqstats10:30:210
16613995710,16cyclictest15339-21ntp_states11:15:220
16613995710,15cyclictest8786-21/usr/sbin/munin08:45:150
16613995710,15cyclictest30998-21ntpq10:10:220
1661399569,17cyclictest16827-21ntp_states09:15:260
1661399569,16cyclictest27230-21switchtime12:00:270
1661399569,16cyclictest17655-21/usr/sbin/munin11:25:190
1661399569,14cyclictest32019-21/usr/sbin/munin10:15:130
1661399568,16cyclictest32208-21/usr/sbin/munin08:10:290
1661399567,17cyclictest1232-21sed08:15:190
1661399567,14cyclictest4913-21/usr/sbin/munin08:30:270
16613995630,16cyclictest16808-21/usr/sbin/munin07:10:150
16613995619,13cyclictest150672chrt09:09:440
1661399559,14cyclictest1035-21sort10:20:180
1661399549,17cyclictest20099-21awk11:35:010
1661399547,14cyclictest24440-21ntp_states11:50:260
1661399545,17cyclictest31199-21ntpq08:05:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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