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2026-03-28 - 04:45

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 376 highest latencies:
System rackfslot4s.osadl.org (updated Sat Mar 28, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2630521230,2chrt26306-21ssh22:04:160
319721200,2chrt3190-21awk21:30:000
1948221200,2chrt19483-21modprobe22:42:050
1774821190,3chrt17745-21ld00:16:270
2138321180,3chrt21382-21ntpq00:21:560
1665121180,3chrt16653-21swap19:16:270
1626721180,1sleep016268-21chrt21:49:070
815921170,1sleep08160-21chrt23:14:210
1600021170,1sleep016001-21chrt00:14:260
1247821170,2chrt12477-21seq00:08:570
124421170,2chrt1240-21ntpq20:35:550
3246921160,2sleep032470-21seq22:12:440
2952921160,2chrt29528-21seq00:34:530
2496021150,3chrt24961-21/usr/sbin/munin20:21:280
898921140,2chrt8990-21chrt19:56:080
1759421100,2chrt17593-21/usr/sbin/munin21:51:020
233021070,2sleep02332-21cut19:45:430
1641221060,2chrt16413-21sleep20:08:380
3048721050,3chrt30488-21sleep19:39:250
1709621050,2chrt17098-21cut21:01:350
262622960,2sleep026260-21fschecks_count21:15:510
133492940,2sleep013350-21chrt22:32:460
238192920,2sleep023820-21chrt23:37:160
204072910,2sleep020410-21cut21:06:330
214972890,2sleep021498-21chrt23:34:240
51742880,2sleep05176-21ssh21:32:170
249692870,1sleep024968-21seq00:27:160
247022860,1sleep024703-21ssh21:13:030
271502840,2sleep027151-21sshd22:05:280
956328010,52sleep09733-21irqstats19:05:360
62432800,1sleep06244-21seq00:00:060
195252770,1sleep019527-21seq19:21:100
150002770,2sleep015003-21sort22:35:490
27442730,2sleep02745-21if_err_eth023:06:010
105352730,2sleep010536-21ls23:17:180
255352670,2sleep025536-21tail23:40:310
29372660,1sleep02939-21sendmail_mailqu22:17:130
183232660,2sleep018324-21seq23:29:430
232672630,3sleep023263-21ssh22:00:000
314332610,2sleep031434-21chrt19:40:370
244792610,1sleep024480-21/usr/sbin/munin22:50:120
228122600,1sleep022813-21ssh22:47:070
51082590,1sleep05127-21grep22:20:530
81292583,46sleep08124-21ntpq21:36:260
276422574,43sleep027696-21latency_hist19:35:030
69092560,2sleep06910-21ssh00:00:510
295712550,2sleep029572-21chrt20:30:170
79672543,6sleep08011-21aten2.4_rfpower22:25:310
37902542,6sleep03808-21hddtemp_smartct20:40:350
106802544,41sleep010678-21ntpq20:51:050
292252503,6sleep029131-21apt-get21:20:250
14262490,1sleep01427-21runrttasks23:04:050
11909904918,23cyclictest0-21swapper23:53:220
302582480,3chrt30256-21/usr/sbin/munin00:35:490
134242483,36sleep013472-21/usr/sbin/munin19:11:220
11909904818,22cyclictest0-21swapper23:49:400
11909904818,22cyclictest0-21swapper23:23:480
218262453,34sleep021828-21users20:16:290
11909904419,18cyclictest10882-21/usr/sbin/munin20:01:050
106432440,3sleep010634-21ssh21:40:450
174732431,35sleep00-21swapper20:10:340
11909904215,20cyclictest26384-21runrttasks20:25:040
1190990415,29cyclictest7496-21ntpq20:45:580
1190990414,19cyclictest29936-21ssh22:57:400
11909904014,17cyclictest22913-21ntpq19:26:400
1190990395,26cyclictest5818-21ntpq19:51:030
11909903817,14cyclictest0-21swapper20:55:110
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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