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2026-06-22 - 04:16

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 the 50 highest latencies:
System rack4slot6s.osadl.org (updated Mon Jun 22, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3062722410,3sleep030630-21uptime23:00:300
954921260,3chrt9544-21cpu19:35:130
696321220,4sleep06966-21wc23:35:250
29949912036,72cyclictest13748-21/usr/sbin/munin19:50:240
2768721160,3chrt27685-21df_inode20:45:120
29949911410,89cyclictest24047-21ntp_states20:30:250
29949911310,89cyclictest5582-21entropy21:25:130
2994991119,89cyclictest440-21seq23:10:220
2994991119,89cyclictest12011-21df21:50:140
1351721110,4chrt13518-21cat21:55:190
2994991109,88cyclictest22473-21/usr/sbin/munin20:25:170
29949911027,72cyclictest8110-21/usr/sbin/munin23:40:170
29949911025,73cyclictest17425-21/usr/sbin/munin22:10:230
2994991098,88cyclictest4539-21/usr/sbin/munin21:20:250
2994991098,75cyclictest5391-21df_inode23:30:140
29949910932,67cyclictest25367-21/usr/sbin/munin22:40:260
29949910922,73cyclictest2818-21df_inode23:20:140
29949910910,86cyclictest1813-21memory21:10:170
2994991089,87cyclictest11617-21seq21:48:170
2994991088,86cyclictest31583-21/usr/sbin/munin21:00:130
2994991088,85cyclictest20132-21users00:25:290
29949910831,67cyclictest29729-21runrttasks20:52:150
29949910830,67cyclictest21475-21runrttasks00:30:540
2994991078,85cyclictest21251-21sh20:20:140
2994991076,88cyclictest14714-21/usr/sbin/munin22:00:170
2994991076,87cyclictest11142-21ntp_states19:40:210
29949910727,69cyclictest1-21systemd19:35:010
29949910723,73cyclictest15744-21runrttasks00:10:150
1893021070,3sleep018927-21grep22:15:290
2994991069,84cyclictest26343-21munin-node20:40:090
2994991069,83cyclictest1643-21sed23:15:170
2994991068,85cyclictest3287-21memory19:10:210
2994991068,82cyclictest6289-21/usr/sbin/munin19:20:290
2994991067,86cyclictest28793-21df_inode22:55:130
2994991067,86cyclictest13160-21awk00:00:130
2994991067,85cyclictest276-21runrttasks20:10:180
2994991067,85cyclictest11367-21chrt23:52:450
29949910626,69cyclictest21056-21runrttasks22:25:120
29949910616,79cyclictest12430-21sshd23:55:570
2994991059,83cyclictest276-21runrttasks23:49:020
2994991058,85cyclictest28240-21chrt22:52:010
2994991058,83cyclictest22461-21cat22:30:170
2994991056,86cyclictest18550-21/usr/sbin/munin00:20:210
29949910531,65cyclictest23637-21runrttasks22:35:140
29949910528,66cyclictest26229-21df_inode22:45:130
29949910522,71cyclictest205-21cron00:20:000
2994991049,85cyclictest7260-21ntp_states19:25:220
2994991049,80cyclictest17597-21ntp_states20:05:240
2994991048,84cyclictest19949-21fw_packets20:15:130
2994991048,83cyclictest30477-21ntp_states20:55:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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