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2025-11-13 - 09:58

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 highest latencies:
System rack4slot6s.osadl.org (updated Thu Nov 13, 2025 00:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
739523750,2sleep07394-21ls19:10:000
1164522510,2sleep011646-21/usr/sbin/munin23:35:300
1963121520,3chrt19630-21/usr/sbin/munin22:00:320
3240821340,3chrt32410-21proc_pri20:45:250
2479121220,3sleep024790-21swap20:15:290
2854021190,2sleep028539-21proc_pri20:30:260
3127721100,3sleep0279-21sshd22:45:410
1550421100,3sleep014988-21/usr/sbin/munin23:50:290
2093921000,2sleep020941-21sed20:00:280
303422990,3sleep030343-21sshd20:37:400
100242980,3sleep010084-21grep23:30:230
125612965,13sleep012601-21cut23:40:150
49292950,3sleep04948-21latency21:05:170
45182940,3sleep04520-21sh23:10:000
141422937,12sleep014204-21grep23:45:270
175732890,4sleep017586-21idleruntime-cro21:55:000
272342885,12sleep027289-21processes20:25:300
312712806,61sleep031340-21/usr/sbin/munin20:40:280
284842780,3sleep028547-21ls22:35:300
233392730,3sleep023390-21processes20:10:260
7410996110,17cyclictest18143-21ntp_states19:50:250
7410996010,20cyclictest13222-21sort19:30:280
170802604,9sleep00-21swapper23:57:100
741099599,17cyclictest7361-21/usr/sbin/munin21:15:290
7410995935,15cyclictest25205-21cron00:30:000
7410995911,18cyclictest18880-21/usr/sbin/munin00:05:150
741099589,15cyclictest11405-21/usr/sbin/munin19:25:250
741099588,17cyclictest31933-21/usr/sbin/munin22:50:150
741099587,19cyclictest26624-21/usr/sbin/munin00:35:180
7410995834,15cyclictest8632-21/usr/sbin/munin23:25:190
7410995826,22cyclictest7101-21runrttasks21:13:560
7410995817,14cyclictest108-21systemd-journal19:44:590
7410995810,18cyclictest7048-21sshd23:19:410
277172583,8sleep00-21swapper22:33:190
741099578,17cyclictest21598-21/usr/sbin/munin22:10:290
741099578,16cyclictest10416-21/usr/sbin/munin19:20:250
741099577,16cyclictest29365-21/usr/sbin/munin22:40:190
7410995734,14cyclictest1291-21/usr/sbin/munin20:50:250
7410995733,15cyclictest23046-21/usr/sbin/munin22:15:180
7410995711,34cyclictest4930-21ntp_states23:10:240
7410995710,19cyclictest12422-21munin-run21:35:000
7410995710,16cyclictest20165-21/usr/sbin/munin00:10:130
741099568,17cyclictest2186-21/usr/sbin/munin20:55:210
741099568,15cyclictest25492-21/usr/sbin/munin22:25:150
741099567,16cyclictest17585-21/usr/sbin/munin00:00:120
741099567,16cyclictest1725-21seq22:58:300
7410995633,14cyclictest21610-21/usr/sbin/munin00:15:170
7410995632,15cyclictest8848-21df_inode19:15:110
7410995632,15cyclictest20882-21/usr/sbin/munin22:05:300
7410995631,16cyclictest17436-21sshd19:47:410
7410995610,17cyclictest24498-21ntp_states22:20:250
7410995610,16cyclictest22083-21/usr/sbin/munin20:05:260
741099559,18cyclictest13918-21df_inode21:40:150
741099559,17cyclictest14260-21ntp_states19:35:260
741099559,14cyclictest22859-21/usr/sbin/munin00:20:160
741099558,14cyclictest17710-21/usr/sbin/munin21:55:260
741099558,14cyclictest15141-21/usr/sbin/munin21:45:140
741099557,18cyclictest7658-21grep23:20:260
741099557,16cyclictest9976-21/usr/sbin/munin21:25:290
741099557,14cyclictest25637-21ntp_states00:30:250
7410995529,16cyclictest13520-21runrttasks21:38:350
7410995528,16cyclictest3634-21/usr/sbin/munin21:00:160
741099549,15cyclictest19385-21/usr/sbin/munin19:55:180
741099549,14cyclictest2355-21ntp_states23:00:220
741099548,15cyclictest9558-21sshd21:22:410
741099548,15cyclictest26256-21sshd20:20:410
741099548,14cyclictest7509-21/usr/sbin/munin19:10:250
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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