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2026-04-19 - 19:52

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 Sun Apr 19, 2026 12:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
438022550,3sleep04376-21latency_hist11:15:010
3088822400,3sleep030886-21grep08:45:220
1034622000,3sleep010343-21cat09:30:280
587221450,2sleep05874-21date09:15:010
1245721270,4chrt12456-21/usr/sbin/munin11:45:190
366521250,4chrt3660-21ntp_states09:05:220
2822921250,2sleep028230-21awk10:40:230
730021240,4chrt7293-21munin-run07:15:000
116521130,3sleep01168-21sort11:00:280
2509721110,3sleep025096-21latency_hist12:35:020
2334321040,3sleep023414-21switchtime08:15:260
24306210213,11sleep024338-21if_eth008:20:150
1546521000,3sleep015469-21ntp_states07:45:230
79852990,3sleep07983-21grep07:15:280
151422940,4sleep015160-21latency09:50:170
201252900,3sleep020144-21/usr/sbin/munin12:15:190
191722906,11sleep019170-21ntp_states10:05:220
205942890,3sleep020625-21ntpq08:05:220
126452850,3sleep012675-21cat07:35:140
252922836,64sleep025307-21cat12:35:180
9152825,10sleep0961-21memory08:55:180
45352808,57sleep04538-21df11:15:130
220162805,8sleep022042-21users10:15:300
23992790,4sleep02468-21/usr/sbin/munin11:05:270
281272777,56sleep028130-21df08:35:130
497526918,29sleep05015-21memory07:05:160
140182663,52sleep00-21swapper09:45:250
6033996125,10cyclictest0-21swapper08:30:270
6033996110,16cyclictest18947-21ntpq12:10:190
6033996017,15cyclictest24054-21/usr/sbin/munin10:25:190
6033996012,19cyclictest11573-21ntpq07:30:190
603399599,16cyclictest31770-21/usr/sbin/munin10:55:270
603399599,15cyclictest5952-21/usr/sbin/munin09:15:100
6033995911,18cyclictest22874-21ntp_states12:25:250
6033995911,18cyclictest19343-21ntp_states08:00:240
603399589,14cyclictest30492-21/usr/sbin/munin10:50:140
6033995831,17cyclictest16714-21/usr/sbin/munin12:00:290
6033995821,14cyclictest29209-21/usr/sbin/munin10:45:120
6033995812,16cyclictest10305-21ntp_states07:25:220
6033995810,16cyclictest17448-21ls10:00:000
603399579,17cyclictest17739-21/usr/sbin/munin07:55:120
603399579,16cyclictest22204-21cat08:10:280
603399579,15cyclictest11714-21users09:35:280
603399578,18cyclictest26617-21/usr/sbin/munin10:35:210
6033995733,15cyclictest12573-21/usr/sbin/munin09:40:150
6033995711,13cyclictest26478-21seq08:28:310
603399569,15cyclictest17732-21irqstats10:00:150
603399569,14cyclictest14867-21df11:55:130
603399568,16cyclictest17412-21/usr/sbin/munin12:05:130
603399568,15cyclictest9714-21df_inode11:35:130
603399568,15cyclictest6326-21/usr/sbin/munin11:20:290
603399567,17cyclictest22767-21/usr/sbin/munin10:20:120
603399567,12cyclictest2086-21/usr/sbin/munin09:00:120
603399566,16cyclictest25334-21/usr/sbin/munin10:30:260
6033995633,14cyclictest9122-21/usr/sbin/munin07:20:240
6033995632,16cyclictest22544-21latency_hist12:25:010
6033995632,16cyclictest20996-21runrttasks10:12:210
6033995632,15cyclictest16531-21/usr/sbin/munin07:50:150
6033995631,16cyclictest11980-21runrttasks11:43:550
6033995611,15cyclictest7089-21/usr/sbin/munin11:25:220
603399559,16cyclictest31950-21/usr/sbin/munin08:50:160
603399559,14cyclictest29383-21/usr/sbin/munin08:40:260
603399559,14cyclictest14304-21which07:40:260
603399558,16cyclictest8373-21/usr/sbin/munin11:30:220
6033995531,15cyclictest7421-21/usr/sbin/munin09:20:150
603399548,15cyclictest13531-21/usr/sbin/munin11:50:270
6033995431,15cyclictest9074-21/usr/sbin/munin09:25:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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