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2026-01-07 - 18:43

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 Jan 07, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2506821250,3chrt25070-21latency_hist12:05:000
1899021230,3chrt18991-21sh09:30:010
1879221210,3chrt18789-21ntpq07:46:030
3197221200,3chrt31970-21ntp_states10:37:000
2511321190,3chrt25114-21runrttasks07:56:150
1259921180,3chrt12600-21runrttasks07:36:080
2430821170,2chrt24309-21seq11:15:020
3074321160,3chrt30744-21fschecks_time08:05:340
2678321160,2chrt26781-21/usr/sbin/munin08:50:490
325321150,2sleep03255-21timerwakeupswit10:42:230
2918821150,2chrt29184-21ld11:21:340
2128021150,3chrt21281-21sh08:41:390
1631821150,2sleep016319-21chrt10:14:040
1007021150,2chrt10071-21chrt10:52:460
2327421130,2chrt23275-21/usr/sbin/munin08:45:400
2676121100,2sleep026762-21runrttasks10:29:480
499321080,3chrt4994-21sleep08:15:500
2170221080,3chrt21705-21cut10:21:520
1099721080,2sleep010998-21seq11:43:090
2889521070,2chrt28896-21sh09:44:450
1708721070,3chrt17085-21if_eth108:35:420
1699721070,4chrt16998-21sleep07:43:470
2792921040,2chrt27931-21sh12:08:570
1320821010,3chrt13206-21/usr/sbin/munin09:21:020
861221000,2sleep08613-21chrt10:02:190
322092990,2sleep032210-21seq09:49:430
110092990,2chrt11010-21cat09:17:230
29142980,2sleep02916-21cut12:20:310
138162950,1sleep013817-21seq08:30:350
325962930,2sleep032598-21cat09:00:410
103192910,2sleep010320-21chrt10:05:170
201382900,2sleep020139-21chrt11:56:530
161672890,2sleep016168-21sh11:02:040
78202880,2sleep07821-21ssh11:38:320
61952850,2sleep06196-21dpkg12:25:130
269562850,2sleep026957-21chrt11:18:280
17462820,2sleep01747-21sshd09:52:090
219532810,1sleep021954-21chrt07:51:090
302402770,1sleep030241-21cat10:35:030
75142740,2sleep07516-21chrt08:20:320
276532737,14sleep027657-21sleep07:08:450
57872720,1sleep05788-21chrt09:10:150
153192710,2sleep015320-21sh11:50:160
50212680,2sleep05022-21seq11:34:480
159862670,2sleep015987-21chrt12:39:580
227862640,2sleep022788-21awk09:35:360
11252640,1sleep01126-21aten2.4_rfpower08:10:250
59002594,43sleep06070-21irqrtprio07:25:440
292272584,43sleep029246-21sort12:10:580
64782570,1sleep06480-21rm09:59:500
178782573,44sleep017852-21apt-get11:05:180
3792560,2sleep0378-21seq11:27:120
5032550,2sleep0507-21cut12:16:090
76452532,6sleep07649-21sleep10:49:570
293452533,8sleep029375-21perl08:55:370
272072523,7sleep026753-21apt-get08:00:180
19152523,40sleep01902-21munin-run07:20:010
180322516,9sleep017946-21ssh10:16:100
117682500,1sleep011769-21chrt12:32:470
28179904817,12cyclictest2094-21/usr/sbin/munin07:20:110
93442470,3chrt9342-21ld07:30:530
28179904515,23cyclictest0-21swapper10:59:190
28179904313,22cyclictest0-21swapper11:48:250
212402433,33sleep021235-21ssh09:32:330
28179904014,10cyclictest11506-21ntp_states08:26:130
28179903919,12cyclictest0-21swapper07:10:270
2817990383,9cyclictest3835-21ntpq09:06:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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