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2026-07-06 - 17:32

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 Mon Jul 06, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
106821320,2sleep01071-21irqrtprio12:01:070
2687821270,3chrt26868-21ntpq11:01:580
512521240,2chrt5126-21/usr/sbin/munin09:41:010
62821170,2chrt629-21ps07:51:240
2367421170,3chrt23675-21seq10:08:230
1564621160,2chrt15647-21sleep09:07:320
3125321150,2sleep031254-21sh10:20:190
3032421130,2chrt30325-21runrttasks10:18:260
2628821130,3chrt26289-21runrttasks09:24:160
1601521130,3chrt16016-21sleep09:57:010
1158521120,3chrt11586-21sleep10:39:290
1074921120,2sleep010752-21irqrtprio07:15:450
996121100,2chrt9957-21ps08:06:230
2964121090,2chrt29642-21awk11:55:380
2872521080,3chrt28724-21seq08:36:170
2193921080,2chrt21940-21seq11:43:360
1469321070,2chrt14694-21cat11:32:210
523321040,2sleep05234-21ls10:30:040
1639221040,2chrt16393-21uname10:46:100
686521020,2chrt6862-21/usr/sbin/munin11:21:020
1509821010,2chrt15099-21sh07:22:350
43042980,1sleep04302-21ntp_states11:16:490
285982980,2sleep028599-21seq11:53:410
215012980,4chrt21502-21sh07:33:100
27172970,2sleep02718-21chrt07:55:350
14592940,2sleep01460-21timerwakeupswit11:12:190
230722900,2sleep023074-21ls10:56:110
190782900,2sleep019083-21tr10:01:490
190532890,2sleep019054-21cat08:21:340
171622850,2sleep017163-21chrt12:25:160
49712848,17sleep05039-21python307:06:010
153232780,1sleep015324-21seq08:15:420
88032760,2sleep08804-21seq09:46:130
126332760,2sleep012634-21cat08:10:480
89852740,2sleep08986-21cat12:12:220
168092740,1sleep016810-21if_eth107:25:410
72332720,2sleep07235-21seq10:32:160
199922720,1sleep019995-21wc09:15:050
286402710,2sleep028642-21chrt11:05:150
244662710,2sleep024469-21cut11:47:130
221122710,2sleep022113-21gcc12:32:080
112732670,1sleep011271-21aten2.4_rfpower09:50:330
218702660,1sleep021917-21cut08:25:450
321582650,3chrt32156-21/usr/sbin/munin08:41:300
130452610,2sleep013046-21seq12:19:040
321202583,7sleep032177-21ssh09:32:260
48292573,8sleep04843-21ps12:06:510
78282553,41sleep07853-21memory07:10:590
12632550,2sleep01261-21aten2.4_rfpower08:45:240
118712543,8sleep011868-21ntpq09:01:210
6680905321,25cyclictest0-21swapper10:14:240
292522533,40sleep029294-21tr07:45:440
214442532,43sleep021439-21ssh09:16:340
133142533,7sleep013323-21ntpq10:41:260
166222522,42sleep016621-21ssh11:35:510
158302520,1sleep015831-21sh12:22:580
288822490,1sleep028886-21chrt09:27:310
229812490,1sleep022979-21if_err_eth207:35:410
250372484,37sleep025046-21ssh12:36:270
98662473,37sleep09874-21df_inode11:25:420
10272472,6sleep01015-21apt-get09:35:130
43032453,33sleep04290-21apt-get08:50:150
6680904311,24cyclictest0-21swapper10:54:220
668090425,17cyclictest5807-21df_inode08:00:300
6680904211,24cyclictest0-21swapper08:31:280
6680904014,20cyclictest0-21swapper07:43:580
6680903911,21cyclictest0-21swapper08:55:410
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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