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2026-09-05 - 10:42

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 Sat Sep 05, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2218522510,2sleep022184-21grep23:30:190
2249821860,2sleep022499-21fgrep21:25:260
1919221470,2sleep019194-21ls23:20:000
3269421220,2sleep032693-21ntp_offset22:05:200
130121220,4chrt1299-21ntp_kernel_err00:15:200
1085021220,5chrt10851-21timerwakeupswit22:45:270
2483421190,4chrt24837-21proc_pri23:40:240
1955521120,4sleep019334-21/usr/sbin/munin23:20:200
907921110,3chrt9078-21forks22:40:130
18569210912,22sleep018599-21ntpq19:05:180
3018721050,4sleep030219-21netstat19:50:190
574621000,4sleep05817-21/usr/sbin/munin20:20:270
95792990,4sleep09642-21ls20:35:270
77502954,9sleep07787-21cat20:30:020
324742958,11sleep032518-21latency_hist20:00:020
294902930,3sleep029512-21idleruntime-cro00:00:000
44982926,8sleep04571-21/usr/sbin/munin20:15:270
38622870,2sleep03864-21missed_timers00:25:190
239552765,60sleep024019-21mailstats19:25:250
18892750,2sleep01890-21mailstats20:05:260
35242643,8sleep00-21swapper22:18:420
19526996034,18cyclictest23269-21/usr/sbin/munin23:35:130
19526996010,17cyclictest6080-21cron00:35:010
19526996010,16cyclictest28723-21memory21:50:170
1952699598,17cyclictest15446-21/usr/sbin/munin23:05:300
19526995933,17cyclictest5456-21/usr/sbin/munin22:25:240
19526995932,17cyclictest27536-21/usr/sbin/munin19:40:140
19526995928,20cyclictest0-21swapper19:20:110
19526995911,18cyclictest15482-21munin-run21:00:000
1952699589,17cyclictest13322-21ntp_states20:50:240
1952699589,16cyclictest26307-21memory19:35:170
1952699588,18cyclictest2374-21/usr/sbin/munin00:20:310
1952699588,17cyclictest27275-21grep23:50:170
1952699588,16cyclictest20810-21/usr/sbin/munin21:20:110
19526995824,23cyclictest31318-21/usr/sbin/munin22:00:180
19526995810,16cyclictest3944-21latency_hist20:15:010
19526995810,14cyclictest24657-21/usr/sbin/munin21:35:170
1952699579,16cyclictest19755-21/usr/sbin/munin21:15:190
1952699578,17cyclictest23375-21/usr/sbin/munin21:30:190
1952699578,16cyclictest1493-21grep22:10:180
1952699578,15cyclictest20679-21df23:25:140
19526995733,14cyclictest12988-21/usr/sbin/munin22:55:150
19526995732,16cyclictest7931-21/usr/sbin/munin22:35:180
19526995732,16cyclictest18604-21/usr/sbin/munin21:10:250
19526995731,16cyclictest952-21runrttasks20:02:130
19526995711,19cyclictest29938-21ntp_states00:00:200
19526995710,16cyclictest29057-21/usr/sbin/munin19:45:310
1952699569,17cyclictest30651-21sshd21:57:220
19526995634,15cyclictest32641-21/usr/sbin/munin00:10:260
19526995632,15cyclictest6279-21runrttasks00:35:130
19526995632,15cyclictest15209-21runrttasks23:04:080
19526995632,14cyclictest16794-21awk21:05:010
19526995611,15cyclictest4053-21/usr/sbin/munin22:20:200
19526995611,15cyclictest27250-21/usr/sbin/munin21:45:160
19526995611,15cyclictest19623-21/usr/sbin/munin19:10:120
1952699558,13cyclictest16910-21/usr/sbin/munin21:05:160
1952699557,16cyclictest11617-21/usr/sbin/munin22:50:100
1952699557,14cyclictest30943-21/usr/sbin/munin00:05:190
19526995533,13cyclictest21433-21/usr/sbin/munin19:15:290
19526995532,15cyclictest26347-21/usr/sbin/munin23:45:270
19526995531,17cyclictest26014-21latency_hist19:35:010
1952699548,16cyclictest11745-21/usr/sbin/munin20:45:190
1952699548,15cyclictest16732-21munin-node23:10:110
1952699548,14cyclictest8127-21ntpq20:30:180
19526995411,14cyclictest10525-21df_inode20:40:130
19526995328,16cyclictest26109-21runrttasks21:40:140
19526995318,12cyclictest6413-21/usr/sbin/munin22:30:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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