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2026-07-08 - 18:21

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 the highest latencies:
System rackfslot4s.osadl.org (updated Wed Jul 08, 2026 12:44:33)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2098421270,2chrt20986-21runrttasks10:09:330
808021240,2sleep08081-21sh09:50:070
1355421210,2chrt13526-21munin-run09:10:030
630021200,2sleep06301-21seq11:24:500
2058221200,2chrt20576-21ntpq10:56:460
724721180,3chrt7246-21/usr/sbin/munin07:15:300
3064821170,2chrt30649-21/usr/sbin/munin12:01:000
2782321140,2sleep027824-21cat08:40:270
2223921130,2chrt22240-21sleep08:30:450
1867121120,2chrt18672-21sleep12:31:260
1469221120,2chrt14690-21ld11:36:470
2979621090,2chrt29799-21cut07:50:470
2155421080,3chrt21556-21cut12:36:030
1465521080,2chrt14656-21grep12:25:520
748721060,1sleep07488-21chrt09:48:590
1878721040,2sleep018789-21ntp_states09:17:160
232192970,2sleep023222-21tr10:12:180
51222930,2sleep05123-21ssh10:34:090
296212930,2sleep029620-21grep11:10:510
278502930,2sleep027853-21idleruntime-cro10:20:020
126982910,2sleep012701-21timerandwakeup12:22:200
268522900,2sleep026855-21sh11:55:410
100762870,2sleep010077-21chrt12:18:530
130282820,2sleep013029-21ssh11:35:010
139462790,2sleep013947-21chrt09:10:330
281932770,2sleep028194-21seq11:08:230
325802760,2sleep032581-21hostname11:15:330
6742740,2sleep0675-21seq10:27:140
53202730,2sleep05318-21smart_sda07:11:270
194052730,2sleep019406-21chrt11:44:270
135292730,4sleep013530-21seq09:57:350
94312710,2sleep09432-21seq11:29:240
278772710,2sleep027878-21cat09:31:050
182827111,46sleep01835-21ntp_states07:05:560
99622680,2sleep09965-21sshd08:10:580
58902670,1sleep05886-21telnet08:05:240
32152640,2sleep03216-21seq09:42:260
68212620,3sleep06818-21ssh12:14:030
254422570,1sleep025441-21seq09:27:120
3664905321,23cyclictest0-21swapper10:44:260
28232530,2sleep02893-21timerwakeupswit08:51:300
211322530,2sleep021133-21cat09:21:010
253582490,3chrt25355-21/usr/sbin/munin08:35:480
3664904817,23cyclictest0-21swapper10:02:550
31712480,2sleep03169-21hddtemp_smartct08:00:380
3664904616,22cyclictest0-21swapper09:39:180
3664904615,21cyclictest0-21swapper10:53:310
227112460,2chrt22710-21seq07:40:160
211442460,3sleep021126-21ssh11:46:270
366490454,20cyclictest19560-21apt-get07:36:060
366490446,9cyclictest18695-21hddtemp_smartct08:25:370
366490445,18cyclictest24018-21ntpq11:01:570
3664904412,13cyclictest24657-21chrt11:51:490
3664904411,16cyclictest0-21swapper07:27:080
366490435,18cyclictest5344-21memory08:55:500
3664904318,18cyclictest30320-21sh10:23:010
3664904314,22cyclictest0-21swapper10:39:550
366490428,23cyclictest0-21swapper09:00:370
366490425,18cyclictest2217-21ntpq12:06:410
366490424,11cyclictest960-21sshd08:49:440
3664904214,21cyclictest0-21swapper10:48:400
3664904120,14cyclictest0-21swapper07:20:250
3664904114,19cyclictest11959-21apt-get08:15:130
366490409,13cyclictest7315-21runrttasks07:59:330
366490403,9cyclictest16569-21df07:30:290
3664903914,11cyclictest15261-21telnet08:20:250
3664903912,19cyclictest7315-21runrttasks07:45:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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