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2026-07-08 - 08:24

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 Jul 08, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
700221230,3chrt7001-21/usr/sbin/munin19:31:250
2952921230,2chrt29528-21/usr/sbin/munin19:15:290
2357821190,2chrt23580-21/usr/sbin/munin00:05:310
192921190,2chrt1928-21/usr/sbin/munin00:21:230
304321160,3chrt3018-21ntpq21:56:560
747321150,3chrt7471-21ld22:51:570
2245921150,3chrt22460-21dpkg23:15:090
2155021150,2sleep021551-21irqrtprio21:36:080
1777321150,4chrt17776-21cut23:56:060
3067421130,3chrt30675-21sh23:26:310
2333021120,2chrt23331-21sh20:49:160
2799721080,2chrt27998-21sleep21:46:030
2743621080,2sleep027437-21chrt22:33:150
3194621060,2chrt31947-21sleep21:02:160
872021040,2chrt8723-21chrt20:25:410
3043921010,2chrt30440-21sh20:08:290
405221000,2sleep04054-21awk21:10:370
129942920,2sleep012995-21seq23:00:440
58952880,2sleep05898-21cut20:20:590
80732870,2sleep08074-21basename00:30:350
140202870,2sleep014021-21basename21:25:350
44902860,2sleep04491-21seq00:25:140
100232840,2sleep010024-21basename22:07:180
240182839,20sleep024032-21ntpq19:05:460
10712820,3chrt1055-21ntpq19:21:050
77422810,2sleep07745-21cut23:41:050
238032800,1sleep023805-21ssh22:27:310
142932800,1sleep014294-21chrt20:35:180
61892790,2sleep06190-21seq23:38:580
107362770,3sleep010737-21fschecks_time23:45:510
212722760,1sleep021273-21seq22:24:240
141952760,2sleep014196-21seq00:39:590
98642740,2sleep09866-21grep19:35:350
80612740,2sleep08064-21cut21:16:080
118412700,2sleep011842-21chrt21:21:300
211922680,2sleep021189-21ssh00:01:100
311862670,2sleep031187-21chrt20:10:130
205952650,2sleep020596-21chrt20:45:040
143572650,1sleep014360-21sed23:51:050
67172640,1sleep06715-21sendmail_mailtr22:02:210
8642600,1sleep0865-21aten2.4_rfpower21:05:250
164882600,2sleep016489-21chrt22:17:020
8172580,2sleep0818-21chrt00:20:020
262442586,7sleep026249-21ntpq20:01:140
173232583,46sleep017330-21seq23:06:450
42752555,41sleep04279-21sleep19:26:160
7262547,7sleep0732-21sh22:41:460
292352540,2sleep029234-21seq00:13:260
259972522,6sleep026004-21apt-get23:20:100
136092520,1sleep013621-21vmstat22:12:320
187772513,40sleep018782-21ssh21:31:580
108592512,42sleep010839-21ssh22:57:070
253842502,41sleep025393-21ld21:41:470
230712492,40sleep023065-21ntpq19:56:130
200572492,6sleep020051-21ntp_states19:51:200
134172493,38sleep013422-21irqstats19:40:450
290472480,2sleep029049-21ls22:35:580
261792480,3chrt26109-21apt-get19:10:220
16662482,39sleep01672-21ssh23:31:450
25979904718,22cyclictest0-21swapper22:48:040
237922470,1sleep023793-21seq20:50:110
25979904614,26cyclictest24283-21ntpq23:17:170
25979904516,21cyclictest0-21swapper20:55:260
25979904321,15cyclictest0-21swapper20:30:330
25979904218,15cyclictest32138-21ssh21:51:560
2597990394,29cyclictest2799-21memory20:15:500
2597990375,25cyclictest16666-21ntpq19:45:530
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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