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2026-05-20 - 09:17

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #f, slot #4

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of all highest latencies:
System rackfslot4s.osadl.org (updated Wed May 20, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
494621340,2chrt4947-21sleep19:30:410
513321280,2sleep05129-21ssh23:39:280
2052821280,2chrt20522-21ntpq20:46:030
738121260,3chrt7382-21seq20:25:350
2915321220,2sleep029152-21seq21:49:240
1113821210,3chrt11139-21if_can022:10:580
2583221200,2chrt25820-21ntpq23:21:220
864821180,2chrt8649-21sh22:55:590
2031521180,1sleep020325-21awk00:01:430
1090721170,2sleep010908-21chrt00:36:200
308521160,2chrt3084-21seq00:25:140
866721130,2sleep08668-21chrt21:19:180
2215621130,2chrt22158-21vmstat19:56:310
893121120,3chrt8930-21seq23:45:160
3107621120,1sleep031077-21cat23:30:030
2465721120,3chrt24659-21chrt21:42:110
687121110,3chrt6872-21sh00:30:480
252721110,2chrt2528-21seq21:10:220
2168921100,3chrt21687-21/usr/sbin/munin23:15:460
181921080,2sleep01818-21ld21:56:320
72321070,2chrt725-21cut00:21:060
2857221070,2chrt28573-21sleep20:07:000
1026021070,2chrt10263-21idleruntime-cro22:10:000
102621040,2chrt1027-21sh21:06:350
3271621030,2chrt32717-21sleep20:14:560
1912321030,2chrt19124-21modprobe23:11:170
174652980,2sleep017468-21timerandwakeup23:57:200
178332930,2sleep017835-21grep19:50:360
205412830,2sleep020542-21seq21:36:330
308672810,2sleep030868-21chrt00:17:230
197212810,2sleep019722-21seq22:23:470
13012800,2sleep01302-21chrt19:25:010
111732800,2sleep011174-21seq20:31:010
312112760,2sleep031212-21seq21:03:540
2257627611,49sleep022578-21ntpq19:05:530
233312750,2sleep023329-21latency00:06:160
178342750,1sleep017837-21grep23:10:060
261372740,1sleep026135-21if_err_can020:55:390
153422740,1sleep015343-21seq22:16:570
37962730,2sleep03797-21chrt22:48:320
48842720,2sleep04885-21aten2.4_rfpower22:50:340
250572710,2sleep025058-21collect222:31:270
30152700,1sleep03016-21seq20:18:190
281862700,2sleep028189-21latency22:36:100
233102670,2sleep023314-21sed20:50:450
19152640,2sleep01914-21seq23:35:020
38962610,2chrt3873-21ssh22:00:240
143862580,1sleep014387-21seq23:05:000
162472560,1sleep016252-21chrt19:47:200
163142530,4sleep016302-21ssh21:30:270
291962520,1sleep029199-21switchtime19:16:270
24436905220,24cyclictest0-21swapper20:36:260
24436905218,15cyclictest9936-21seq21:20:590
237582510,2sleep023757-21basename20:00:240
24436905019,23cyclictest0-21swapper00:14:550
24436905019,22cyclictest16302-21chrt20:40:170
24436904918,23cyclictest7361-21ps23:42:150
24436904917,24cyclictest0-21swapper23:53:370
316072480,3chrt31603-21/usr/sbin/munin21:52:220
24436904827,14cyclictest1445-21/usr/sbin/munin19:26:270
24436904819,21cyclictest32062-21ntpq22:42:060
24436904818,22cyclictest0-21swapper21:28:490
24436904816,23cyclictest21446-21cut22:26:040
24436904728,13cyclictest8343-21fschecks_time19:35:350
24436904726,14cyclictest4512-21/usr/sbin/munin20:20:420
24436904621,15cyclictest10991-21apt-get19:40:180
24436904511,13cyclictest25915-21ntpq19:11:230
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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