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2026-08-24 - 09:57

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 Aug 24, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2001022450,3sleep020009-21wc20:35:280
3240521230,3chrt32403-21memory23:30:210
1747121190,4chrt17470-21/usr/sbin/munin20:25:280
3231421170,3chrt32317-21latency_hist21:25:010
2773721170,3chrt27736-21wc21:05:260
897221160,3chrt8973-21/usr/sbin/munin00:05:180
2918421150,4sleep029256-21users19:05:260
386121120,4sleep03864-21df21:40:110
793921100,3sleep07940-21cat21:55:210
1034521070,3sleep010344-21sort20:00:020
2471421050,3sleep024746-21ntpq23:00:210
717221040,3sleep07173-21sshd23:58:410
52882967,13sleep05352-21/usr/sbin/munin21:45:210
56982920,4sleep05763-21switchtime19:40:270
23852926,11sleep02433-21sort21:35:010
287552900,4sleep028775-21ntpq21:10:200
261112906,11sleep026123-21sort21:00:190
103182850,4sleep010347-21/usr/sbin/munin00:10:210
210572830,4sleep021064-21awk20:40:240
270342820,3sleep027073-21cpu23:10:100
78872816,60sleep07893-21df_inode19:50:130
178592800,4sleep017885-21latency_hist22:35:000
29868996511,19cyclictest4553-21users19:35:300
2986899619,18cyclictest15505-21awk22:25:130
29868996135,16cyclictest3701-21/usr/sbin/munin23:45:130
29868996135,16cyclictest32766-21/usr/sbin/munin19:20:200
29868996035,16cyclictest23436-21/usr/sbin/munin22:55:230
29868996029,21cyclictest14922-21runrttasks00:28:330
29868996011,16cyclictest22381-21awk22:50:240
2986899598,17cyclictest7686-21memory00:00:200
2986899597,18cyclictest4903-21/usr/sbin/munin23:50:150
2986899596,17cyclictest13000-21/usr/sbin/munin20:10:300
29868995934,17cyclictest14291-21/usr/sbin/munin22:20:170
29868995933,16cyclictest7481-21runrttasks19:48:090
29868995914,15cyclictest1395-21/usr/sbin/munin19:25:270
29868995910,18cyclictest25752-21/usr/sbin/munin23:05:300
138982593,9sleep00-21swapper22:19:190
2986899589,15cyclictest30089-21ntp_states21:15:240
2986899588,16cyclictest18169-21/usr/sbin/munin20:30:170
29868995832,16cyclictest11411-21/usr/sbin/munin00:15:140
29868995819,15cyclictest30131-21/usr/sbin/munin19:10:160
29868995810,15cyclictest29520-21sendmail-msp23:20:010
2986899579,16cyclictest11444-21cut22:10:010
2986899578,16cyclictest2972-21ntp_states19:30:240
29868995733,15cyclictest2443-21/usr/sbin/munin23:40:140
29868995731,15cyclictest14946-21runrttasks20:15:580
29868995710,20cyclictest3694-21sendmail-msp21:40:010
2986899569,19cyclictest18426-21mailstats22:35:250
2986899569,18cyclictest9600-21sshd22:00:410
2986899568,16cyclictest20589-21/usr/sbin/munin22:45:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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