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2026-09-07 - 18:37

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 Sep 07, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
910822690,3sleep09105-21cat11:25:180
758022460,3sleep07576-21cat11:20:020
2220022430,3sleep022201-21/usr/sbin/munin12:15:240
2916221270,4chrt28647-21/usr/sbin/munin08:30:270
3167021260,3chrt31057-21/usr/sbin/munin10:45:310
2669621210,4chrt26694-21sshd12:33:170
7890991199,15cyclictest29993-21df_inode08:35:130
7890991199,13cyclictest17297-21users11:55:290
2642121190,3chrt26419-21awk10:25:280
7890991179,95cyclictest31405-21latency08:40:170
7890991179,15cyclictest28753-21ntp_states10:35:210
7890991178,16cyclictest21020-21ntp_states10:05:210
7890991177,17cyclictest13452-21users11:40:290
7890991177,15cyclictest23746-21systemctl10:15:250
78909911720,85cyclictest5019-21latency_hist11:10:010
3272421170,3chrt32720-21cat08:45:180
7890991168,95cyclictest18076-21df_inode12:00:140
7890991168,16cyclictest22635-21grep08:05:260
7890991167,15cyclictest27644-21grep10:30:260
7890991159,15cyclictest19883-21ntp_states07:55:210
7890991158,16cyclictest24219-21chrt12:24:010
7890991158,14cyclictest7803-21/usr/sbin/munin09:15:210
1163021150,4chrt11627-21ls09:30:010
7890991148,16cyclictest12280-21/usr/sbin/munin07:25:250
7890991147,16cyclictest26144-21df_inode08:20:130
7890991147,15cyclictest149122sleep009:40:370
1050821140,3sleep010505-21cat07:20:010
7890991139,90cyclictest6483-21date09:10:010
7890991139,88cyclictest2291-21sshd08:53:180
7890991139,16cyclictest1242-21/usr/sbin/munin10:55:130
7890991138,17cyclictest14222-21sshd07:34:170
7890991138,15cyclictest27446-21which12:35:250
7890991138,14cyclictest19778-21/usr/sbin/munin10:00:250
7890991137,16cyclictest18106-21latency_hist09:55:010
7890991137,14cyclictest7465-21sshd09:13:170
7890991137,14cyclictest10651-21df07:20:130
7890991137,13cyclictest29831-21df10:40:130
7890991137,13cyclictest166092sleep007:42:330
78909911310,15cyclictest21199-21ntp_states08:00:210
407721130,3sleep04082-21irqstats09:00:160
7890991129,14cyclictest3108-21awk08:55:250
7890991128,14cyclictest18912-21sshd07:50:290
7890991128,12cyclictest2657-21/usr/sbin/munin11:00:170
7890991126,16cyclictest14218-21grep09:40:020
7890991119,15cyclictest18192-21latency_hist07:50:010
7890991118,14cyclictest9275-21irqstats09:20:170
7890991118,14cyclictest24824-21df_inode08:15:130
7890991118,14cyclictest15610-21memory11:50:170
7890991117,15cyclictest23894-21which08:10:250
7890991117,14cyclictest8349-21proc_pri07:10:250
7890991117,14cyclictest700-21sshd10:52:170
7890991117,14cyclictest24618-21uname12:25:170
7890991109,15cyclictest15721-21grep09:45:170
7890991108,13cyclictest20649-21df_inode12:10:140
7890991108,13cyclictest15146-21sshd07:36:170
7890991107,15cyclictest27423-21df_inode08:25:130
7890991106,12cyclictest15394-21latency_hist11:50:010
7890991098,14cyclictest7940-21grep07:10:010
7890991098,13cyclictest8888-21sort11:25:010
7890991097,15cyclictest20407-21seq12:09:370
7890991097,14cyclictest19008-21runrttasks09:57:410
7890991097,13cyclictest11480-21modprobe11:35:010
7890991097,12cyclictest5104-21/usr/sbin/munin11:10:130
7890991097,12cyclictest24680-21df_inode10:20:140
7890991088,13cyclictest11885-21memory09:30:170
7890991076,12cyclictest10408-21memory11:30:170
78909910711,12cyclictest22959-21sshd10:13:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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