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2026-08-17 - 02:18

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Mon Aug 17, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1839722670,3sleep018398-21entropy22:30:150
87622500,2sleep0874-21ls19:15:260
2764421780,2sleep027642-21ntpq23:05:190
1896121290,4chrt18959-21mailstats20:25:270
3255521090,3sleep032574-21sendmail21:20:010
3108321050,4sleep031116-21sendmail23:20:000
841621000,3sleep08420-21open_files19:45:260
20812970,2chrt2079-21fgrep19:20:270
192752970,4sleep019278-21cron00:39:590
152222960,4sleep014611-21/usr/sbin/munin20:10:320
303062930,3sleep030345-21netstat21:10:200
107712900,3sleep010824-21/usr/sbin/munin22:00:200
200702835,65sleep020074-21ntp_states20:30:240
238482816,61sleep023880-21missed_timers20:45:210
262822790,3sleep026288-21entropy20:55:150
16472796,61sleep01645-21ntp_states23:30:240
3037827721,32sleep030419-21/usr/sbin/munin19:05:160
59592736,11sleep0288-21snmpd23:46:300
287742670,3sleep028775-21cat23:10:180
31433996533,23cyclictest6033-21/usr/sbin/munin19:35:260
31433996215,19cyclictest18465-21sort20:25:020
31433996135,16cyclictest31838-21/usr/sbin/munin23:20:260
3143399599,16cyclictest2828-21/usr/sbin/munin21:30:320
3143399598,17cyclictest4108-21/usr/sbin/munin21:35:140
3143399598,17cyclictest307-21munin-node00:20:120
31433995910,17cyclictest1653-21/usr/sbin/munin21:25:180
31433995910,15cyclictest32543-21/usr/sbin/munin23:25:320
3143399589,15cyclictest9399-21/usr/sbin/munin19:50:270
3143399589,15cyclictest31536-21/usr/sbin/munin19:10:210
3143399588,17cyclictest307-21munin-node21:55:100
3143399587,18cyclictest7798-21/usr/sbin/munin23:55:170
31433995834,16cyclictest4534-21/usr/sbin/munin19:30:220
31433995833,16cyclictest7181-21/usr/sbin/munin21:45:270
31433995833,16cyclictest25206-21/usr/sbin/munin22:55:280
31433995833,15cyclictest23793-21/usr/sbin/munin22:50:240
31433995815,14cyclictest16058-21cat00:25:280
31433995812,18cyclictest3019-21df_inode19:25:150
31433995810,18cyclictest27276-21ls23:05:010
31433995810,15cyclictest22514-21irqstats20:40:170
3143399579,18cyclictest307-21munin-node20:15:110
3143399578,16cyclictest8177-21/usr/sbin/munin21:50:200
3143399577,18cyclictest28821-21/usr/sbin/munin21:05:280
3143399577,18cyclictest25217-21ntpq20:50:200
3143399577,17cyclictest6834-21/usr/sbin/munin19:40:250
3143399577,13cyclictest6350irq/103-63fec0000:00:280
31433995733,15cyclictest12595-21/usr/sbin/munin20:00:320
31433995732,16cyclictest21076-21/usr/sbin/munin22:40:160
31433995724,24cyclictest3909-21latency_hist23:40:020
3143399569,16cyclictest6790-21/usr/sbin/munin23:50:220
3143399569,15cyclictest19604-21/usr/sbin/munin22:35:190
3143399567,16cyclictest14157-21tr00:20:000
31433995633,14cyclictest11978-21/usr/sbin/munin22:05:160
31433995630,17cyclictest17805-21runrttasks00:33:270
31433995629,17cyclictest17170-21/usr/sbin/munin22:25:190
31433995610,17cyclictest21251-21memory20:35:190
31433995610,16cyclictest3948-21/usr/sbin/munin23:40:140
3143399559,16cyclictest15160-21sshd22:16:280
3143399557,14cyclictest10831-21irqstats19:55:180
31433995533,15cyclictest16829-21runrttasks22:24:240
31433995532,14cyclictest11728-21/usr/sbin/munin00:10:120
31433995531,16cyclictest11485-21runrttasks00:09:290
31433995530,16cyclictest5468-21runrttasks21:40:110
31433995530,15cyclictest13758-21/usr/sbin/munin22:10:290
31433995510,13cyclictest114-21systemd-journal21:20:020
31433995411,30cyclictest13600-21awk20:05:200
3143399539,15cyclictest22198-21cpu22:45:120
3143399538,13cyclictest27817-21ntp_states21:00:240
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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