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2026-08-19 - 11:23

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 Aug 19, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1075621320,2chrt10757-21sh20:32:240
2913121270,2chrt28021-21/usr/sbin/munin00:16:450
881621230,2chrt8817-21ls22:57:260
2460521220,3chrt24599-21ntpq19:10:550
171421200,3chrt1716-21seq21:10:370
1619321200,3chrt16191-21ntpq21:31:340
266421190,4chrt2182-21apt-get20:20:220
1306921190,3chrt13070-21fschecks_count22:15:530
2851221170,2chrt28513-21aten2.4_rfpower21:50:350
1670021150,3chrt16701-21if_eth122:21:070
1917521140,2chrt19176-21sh22:25:060
418121130,2chrt4182-21runrttasks22:02:140
696021120,2chrt6950-21ntpq00:31:300
2057321120,2chrt20575-21ssh00:03:470
1132621120,2chrt11321-21awk21:25:010
1085021120,2sleep010852-21switchtime00:37:190
1779321110,2chrt17795-21sendmail00:00:020
1647921110,2chrt16184-21apt-get19:51:050
2441221100,2chrt24413-21chrt21:44:220
3183021080,3chrt31831-21chrt22:43:390
670121070,2sleep06702-21seq23:42:460
220621070,2chrt2205-21ls00:25:050
1939421070,2chrt19395-21sleep20:46:140
2731721060,2sleep027318-21gpgv21:00:060
154221030,2chrt1543-21sleep20:18:190
2873621010,2chrt28737-21sh19:17:440
136252970,2sleep013630-21irqrtprio19:45:450
315332950,2sleep031534-21seq23:31:190
139172880,1sleep013918-21seq23:05:360
54272860,2sleep05426-21awk22:52:260
213862840,1sleep021384-21head20:50:240
74772820,2sleep07478-21sh21:18:570
16952790,3chrt1680-21ntpq19:26:130
100472790,2sleep010049-21cpu19:40:280
53912780,2sleep05392-21seq00:29:540
179632780,2sleep017965-21chrt20:45:020
44472760,2sleep04448-21seq23:40:060
215192730,2sleep021520-21basename00:05:360
196102700,2sleep019611-21chrt19:55:310
132742660,2sleep013276-21cat23:52:220
3792640,1sleep0380-21hostname22:45:350
65842582,6sleep06633-21ssh22:06:060
23402905624,24cyclictest0-21swapper20:00:410
86432553,42sleep08732-21latency_hist20:30:030
256552552,6sleep025679-21users23:22:210
35422543,42sleep03529-21apt-get19:30:150
129392543,6sleep012947-21ntpq20:35:560
100012530,2sleep09968-21ssh22:11:120
254512522,40sleep025455-21chrt20:05:060
127252520,3chrt12723-21/usr/sbin/munin21:26:210
266092512,41sleep026592-21ssh22:36:050
290112500,2sleep029012-21sh23:27:240
23402905019,24cyclictest0-21swapper22:33:100
2141024812,21sleep021418-21ntpq19:05:410
220332472,38sleep022028-21ssh23:17:140
23402904617,21cyclictest0-21swapper23:00:060
307592450,3chrt30754-21memory19:20:500
304862453,35sleep07315-21runrttasks21:04:460
2340290456,11cyclictest7942-21ntpq19:36:210
23402904517,21cyclictest0-21swapper00:14:380
2340290446,11cyclictest26799-21python321:47:260
23402904414,23cyclictest0-21swapper23:49:160
207682440,3chrt20769-21runrttasks21:38:430
23402904317,10cyclictest17646-21fw_packets23:10:550
23402904316,22cyclictest0-21swapper20:12:110
318112410,1sleep031812-21chrt21:05:530
23402904116,19cyclictest519-21/usr/sbin/munin21:56:410
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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