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2026-06-15 - 04:22

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 Mon Jun 15, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2958421250,3chrt29585-21runrttasks22:02:320
896321200,3chrt8964-21aten2.4_rfpower22:20:510
474121200,2chrt4742-21irqrtprio23:51:050
2844521190,2sleep028446-21chrt22:49:540
2723321160,2chrt27235-21runrttasks23:36:060
1804121150,2chrt18043-21sleep00:11:270
831821130,2chrt8319-21chrt23:07:210
1201521130,3chrt12014-21seq22:25:260
2291321120,2chrt22912-21sshd21:52:350
1667621120,2sleep016677-21sh21:43:390
1197921120,3chrt11980-21/usr/sbin/munin20:45:540
1509521100,2chrt15094-21sshd23:17:340
2243821080,2sleep022439-21aten2.4_rfpower22:40:510
1385521070,2chrt13856-21sh00:05:240
2070521060,2sleep020706-21latency_hist21:50:060
2610221010,2sleep026104-21idleruntime-cro23:35:000
273122960,2sleep027313-21find19:27:000
47302890,2sleep04731-21chrt22:14:400
224712890,2sleep022472-21seq19:20:220
208542890,2sleep020855-21cat23:26:160
326262870,1sleep032628-21cut22:55:550
288702860,2sleep028872-21tail19:30:240
20342800,2sleep02035-21chrt21:21:280
268252790,1sleep026826-21seq21:58:550
283762780,2sleep028377-21chrt21:12:280
59292760,3chrt5911-21ntpq20:36:100
194462750,2sleep019447-21chrt19:15:480
177552750,2sleep017756-21chrt22:33:350
175832730,2sleep017584-21seq20:04:120
127532710,2sleep012754-21seq23:14:560
241732700,1sleep024174-21hostname00:20:350
170732650,2sleep017074-21chrt19:11:040
123172635,8sleep012343-21perl19:55:370
223092623,10sleep022343-21sendmail_mailqu00:17:150
22302624,9sleep02255-21interrupts00:36:050
314792600,2sleep031481-21fschecks_time22:05:550
309632583,7sleep030943-21apt-get20:25:160
205152583,9sleep07315-21runrttasks20:08:080
317062573,45sleep031711-21/usr/sbin/munin00:31:130
81812555,43sleep08211-21ssh21:31:040
108112550,2sleep010812-21ssh21:35:210
3192543,43sleep0313-21ssh23:45:020
87552523,40sleep08739-21apt-get19:50:150
1377625214,22sleep013773-21ntpq19:05:410
116812523,7sleep011674-21ntpq00:01:200
304042513,40sleep030381-21munin-run00:30:040
45622503,9sleep04567-21ntp_states23:01:500
3332500,2chrt334-21latency19:35:480
316012490,1sleep031602-21chrt22:54:320
303502493,8sleep0412-21snmpd20:23:550
20212494,36sleep02059-21perl20:30:350
18672490,3sleep01858-21sshd23:46:350
15771904717,23cyclictest0-21swapper20:16:100
15771904617,21cyclictest0-21swapper23:55:080
15771904617,21cyclictest0-21swapper21:27:590
66012450,3sleep06587-21ssh22:16:530
15771904517,20cyclictest29808-21apt-get21:15:240
188292441,4sleep00-21swapper20:56:420
238412430,2chrt23837-21tune2fs21:05:360
15771904317,19cyclictest17907-21ntpq23:21:560
224432420,2sleep022444-21chrt20:10:530
1577190428,19cyclictest7381-21kworker/0:120:40:050
1577190424,12cyclictest18938-21df22:35:360
1577190415,17cyclictest4712-21seq19:42:580
15771904011,13cyclictest8457-21runrttasks19:49:450
1577190394,28cyclictest20590-21diskstats21:00:320
15771903913,9cyclictest14342-21df_inode20:50:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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