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2026-06-20 - 00:53

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 Fri Jun 19, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
901921220,2chrt8995-21ntpq12:06:420
2949521190,2chrt29496-21chrt10:11:320
1275421160,2chrt12755-21sleep07:13:250
1731121150,2chrt17310-21/usr/sbin/munin11:30:540
1706621150,2chrt17065-21/usr/sbin/munin08:11:310
310521140,3chrt3109-21seq08:41:270
2457621140,2chrt24577-21sleep07:31:430
2408221140,2chrt24083-21latency_hist12:30:040
3138221130,3chrt31381-21ssh11:51:430
2479021130,1sleep024791-21chrt10:05:080
1420021130,2chrt14201-21/usr/sbin/munin10:37:190
3017121120,2chrt30172-21chrt09:24:340
2564321120,3chrt25644-21sleep12:31:470
2466621120,2chrt24667-21sh11:41:300
808721110,2sleep08088-21chrt10:28:100
1543021110,2sleep015431-21fschecks_time09:50:570
923921100,2sleep09240-21basename10:30:340
1258021100,1sleep012581-21chrt11:23:350
1233221100,2sleep012335-21irqrtprio08:56:360
2586921090,2sleep025870-21timerandwakeup09:17:290
397421080,2sleep03976-21grep11:10:500
1153721080,2chrt11538-21sh12:10:550
3077721070,2chrt30778-21sleep08:35:000
2243021060,4chrt22432-21awk09:12:290
1643321060,2chrt16437-21modprobe07:20:000
92202990,2sleep09221-21awk08:51:240
184212970,1sleep018423-21cut09:55:360
116942970,2sleep011696-21cut09:45:340
259212910,2sleep025924-21sed10:55:160
48182880,2sleep04820-21cut12:00:500
58772820,1sleep05878-21chrt08:46:010
168982820,2sleep016900-21sort10:41:140
33002810,1sleep03301-21seq09:32:210
317382800,1sleep031736-21sshd11:03:310
173212770,2sleep017369-21irqrtprio07:20:440
256622760,2sleep025663-21seq10:55:070
311582750,2sleep031160-21sh08:35:260
273942750,2sleep027395-21cat11:46:010
71162738,51sleep07213-21chrt07:05:020
68502700,1sleep06852-21cut11:15:310
19842690,1sleep01985-21chrt11:07:190
13392690,2sleep01342-21sort07:46:310
177282630,1sleep017729-21seq09:05:290
161012610,2sleep016102-21chrt11:29:060
65602594,44sleep06596-21ssh09:37:200
213372560,1sleep021338-21sshd11:36:320
31702554,8sleep03174-21diskstats07:50:320
314532550,46sleep031457-21sleep07:43:340
180242554,8sleep0439-21sh12:20:490
3722543,8sleep0376-21ntpq10:16:340
275942540,2sleep027609-21aten2.4_rfpower12:35:310
309592533,7sleep030928-21ssh09:25:400
25072533,42sleep02500-21ntpq11:57:080
40862523,41sleep04093-21sh10:22:130
206182522,41sleep07315-21runrttasks07:25:440
198742522,6sleep019855-21ssh10:46:050
100752490,1sleep010076-21ld08:00:520
65392470,3chrt6538-21/usr/sbin/munin07:55:410
230222470,3chrt22991-21ntpq10:01:540
10277904517,21cyclictest0-21swapper12:18:150
1027790445,20cyclictest25939-21/usr/sbin/munin07:35:370
1027790445,20cyclictest25869-21ntpq08:25:570
162502420,2chrt16251-21modprobe09:02:200
10277904114,10cyclictest0-21swapper09:42:350
1027790406,27cyclictest12363-21apt-get08:05:510
1027790394,10cyclictest19609-21ntpq08:15:550
10277903814,17cyclictest21686-21/usr/sbin/munin08:20:450
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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