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2026-04-23 - 01:47

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 100 highest latencies:
System rackfslot4s.osadl.org (updated Wed Apr 22, 2026 12:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1477521270,2chrt14774-21modprobe07:20:000
479721230,3chrt4798-21sleep09:36:550
2392921210,2chrt23930-21sleep10:55:030
440421200,2sleep04405-21rm11:14:160
1522021180,3chrt15219-21/usr/sbin/munin11:30:350
2824321170,2chrt28244-21awk11:01:020
277221150,2chrt2773-21runrttasks09:34:260
929921140,2chrt9300-21runrttasks09:44:050
3124121140,2sleep031242-21ld10:16:230
63321130,2chrt629-21ntpq11:56:570
1683421120,2chrt16833-21sshd07:22:050
1068321120,2chrt10684-21modprobe12:12:040
3164221110,2chrt31643-21/usr/sbin/munin07:46:010
2677721090,2chrt26776-21seq10:59:010
409221080,2sleep04093-21wc07:55:020
3113221060,2chrt31131-21sh08:37:050
1250521040,3chrt12506-21sh08:07:330
1080921000,2sleep010810-21apt-get10:35:110
18042980,1sleep01807-21cut10:21:040
54282950,3sleep05429-21chrt12:04:490
174242940,1sleep017425-21chrt10:45:050
286732930,1sleep028674-21runrttasks09:24:360
193842930,2sleep019386-21cut12:25:330
114232930,2sleep011424-21chrt11:25:020
160112900,2sleep016012-21seq08:13:040
250952890,2sleep025096-21ssh09:19:020
183522870,2sleep018354-21mailstats08:16:250
277662850,2sleep027767-21seq07:40:310
220832850,2sleep022084-21chrt09:15:040
279592810,1sleep027960-21seq11:49:570
151222800,2sleep015123-21chrt12:18:490
11962800,2sleep01197-21runrttasks11:09:320
95322740,2sleep09533-21vmstat10:32:260
287062740,2sleep028707-21awk10:13:030
242532730,1sleep024254-21seq11:44:010
182182730,1sleep018220-21awk07:25:250
131992730,2sleep013200-21basename09:00:390
290042700,2sleep029011-21irqrtprio11:51:020
57012688,48sleep05195-21apt-get07:05:290
242112680,2sleep024212-21uname10:06:070
157402660,1sleep015741-21collect210:41:580
32852610,2sleep03286-21seq08:45:050
245592603,8sleep024614-21tr08:26:240
240022583,8sleep024000-21ntp_states12:31:490
270692564,44sleep027066-21ntpq12:36:220
162802564,41sleep016300-21chrt09:05:380
121682563,7sleep012171-21seq09:48:020
242602552,6sleep024267-21apt-get07:35:100
130242530,2sleep013025-21collect211:26:410
160542522,7sleep016057-21ssh09:54:250
262732510,2sleep026274-21chrt08:30:180
198312510,3sleep019822-21ssh11:37:010
68542502,40sleep06838-21ssh12:06:140
169562502,5sleep016938-21ssh09:55:440
8604904919,23cyclictest0-21swapper11:18:080
8604904919,22cyclictest0-21swapper10:04:290
76732483,37sleep07690-21df08:00:270
220302484,37sleep022056-21runrttasks07:30:440
50432470,1sleep05046-21cut10:26:050
8604904617,22cyclictest0-21swapper09:29:520
97002420,2sleep09702-21tail08:55:250
8604904015,19cyclictest20586-21/usr/sbin/munin08:20:390
8604904014,19cyclictest11926-21kworker/0:212:20:450
860490394,16cyclictest1392-21ntpq08:41:060
8604903813,19cyclictest4241-21apt-get07:55:160
8604903812,18cyclictest8740-21apt-get07:10:170
860490377,11cyclictest9353-21munin-run08:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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