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2026-08-10 - 20:22

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 10, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3273322560,2sleep032732-21sort11:45:010
827922510,3sleep08278-21wc12:15:160
1056421800,3sleep010561-21cat12:25:010
667021490,3sleep06715-21latency_hist12:10:020
2910921460,3sleep029110-21modprobe07:20:000
1244721230,3chrt12448-21switchtime12:30:280
3167621200,2sleep031675-21grep09:35:100
463721190,4chrt4636-21/usr/sbin/munin07:50:140
1145121180,4chrt11450-21/usr/sbin/munin10:20:280
1844821130,4sleep018464-21munin-run10:50:000
215921060,3sleep02158-21wc09:45:250
2510421030,4sleep025143-21/usr/sbin/munin11:15:140
1361721020,4sleep013623-21missed_timers10:30:200
186452954,79sleep018689-21latency_hist08:45:010
118182930,3sleep011850-21latency_hist12:30:010
91772920,3sleep0288-21snmpd10:13:070
256382920,3sleep025347-21/usr/sbin/munin07:05:220
209602870,3sleep020961-21sshd10:59:340
190632860,3sleep019131-21sed10:50:280
122872820,4sleep012293-21latency10:25:180
122742820,3sleep012288-21cpu08:20:110
245932815,9sleep0288-21snmpd11:12:290
26544996232,22cyclictest23059-21runrttasks11:05:280
26544996010,21cyclictest3484-21ntpq07:45:190
26544996010,15cyclictest16384-21ntpq08:35:200
26544995928,20cyclictest0-21swapper08:55:140
26544995910,20cyclictest13294-21chrt12:35:120
2654499589,20cyclictest6839-21df12:10:130
2654499589,17cyclictest26355-21/usr/sbin/munin11:20:210
2654499589,16cyclictest10954-21/usr/sbin/munin08:15:300
26544995834,16cyclictest10746-21runrttasks10:20:020
26544995833,16cyclictest7293-21/usr/sbin/munin08:00:180
26544995832,16cyclictest4401-21/usr/sbin/munin12:00:190
26544995828,21cyclictest20926-21runrttasks08:52:470
26544995810,20cyclictest4428-21df09:55:140
26544995810,16cyclictest6973-21/usr/sbin/munin10:05:280
2654499579,17cyclictest8393-21/usr/sbin/munin08:05:160
2654499578,17cyclictest820-21wc11:45:270
2654499578,17cyclictest28113-21ntp_states09:20:220
2654499577,17cyclictest9672-21/usr/sbin/munin08:10:160
2654499576,18cyclictest30206-21/usr/sbin/munin11:35:150
26544995734,14cyclictest16267-21/usr/sbin/munin10:40:200
26544995719,23cyclictest26572-21df_inode09:15:150
2654499569,15cyclictest632-21/usr/sbin/munin07:35:140
2654499568,15cyclictest3090-21/usr/sbin/munin09:50:160
2654499568,15cyclictest29248-21/usr/sbin/munin07:20:270
2654499568,15cyclictest28924-21/usr/sbin/munin11:30:160
2654499568,14cyclictest21462-21ntp_states11:00:220
26544995634,15cyclictest31345-21runrttasks09:33:230
26544995633,14cyclictest27829-21/usr/sbin/munin11:25:170
26544995613,16cyclictest27109-21mailstats07:10:250
26544995610,15cyclictest3191-21ntp_states11:55:230
2654499559,16cyclictest25273-21df09:10:120
2654499558,16cyclictest14706-21/usr/sbin/munin10:35:240
2654499558,14cyclictest517-21/usr/sbin/munin09:40:300
2654499557,16cyclictest1884-21grep11:50:200
26544995531,17cyclictest19469-21runrttasks08:46:190
26544995531,16cyclictest30192-21runrttasks09:29:290
26544995530,16cyclictest24031-21/usr/sbin/munin09:05:140
2654499549,18cyclictest16001-21munin-plugin-st08:35:010
2654499549,13cyclictest5750-21chrt10:00:140
2654499548,17cyclictest2070-21/usr/sbin/munin07:40:140
2654499548,16cyclictest31809-21/usr/sbin/munin07:30:170
26544995429,16cyclictest5856-21runrttasks07:55:120
26544995410,12cyclictest22923-21ntp_states09:00:220
2654499539,14cyclictest30533-21/usr/sbin/munin07:25:150
2654499538,15cyclictest13639-21/usr/sbin/munin08:25:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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