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2026-08-11 - 05:21

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 Tue Aug 11, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1381923130,1sleep013821-21ntpq19:05:390
2626121220,2chrt26254-21ntpq22:47:190
1287821180,3chrt12071-21/usr/sbin/munin23:16:060
1516321170,2chrt15157-21ntpq21:41:430
793321160,2chrt7932-21seq20:40:430
2352621160,2chrt23524-21ld19:21:160
3167621150,3chrt31677-21/usr/sbin/munin22:55:440
870221130,3chrt8703-21runrttasks23:10:070
1737721130,2sleep017378-21irqrtprio20:55:430
474721120,2chrt4746-21/usr/sbin/munin20:35:420
2109121120,2sleep021092-21chrt20:10:180
1638021120,2sleep016381-21switchtime20:01:280
1041621100,2sleep010417-21apt-key21:35:200
2476521080,1sleep024766-21latency21:56:080
2220521080,3chrt22206-21sh21:03:540
761621050,2sleep07617-21chrt23:56:220
2281921050,3chrt22820-21sleep21:53:280
1524521050,2chrt15246-21sh20:51:520
3168021040,2chrt31679-21/usr/sbin/munin19:35:090
346021030,2sleep03461-21seq23:50:410
3083121030,3chrt30832-21runrttasks22:54:330
2320521020,2sleep023206-21seq22:42:320
6712980,2sleep0672-21chrt22:09:180
46512960,2sleep04652-21hostname22:15:320
97132900,2sleep09714-21seq22:22:200
240122840,2sleep024013-21basename23:32:150
30902830,1sleep03091-21chrt21:24:290
297222830,2sleep029723-21chrt19:31:160
164432830,2sleep016446-21sed22:32:190
237542820,2sleep023752-21if_err_eth000:21:030
138752820,2sleep013874-21grep00:06:080
65282810,2sleep06532-21wc23:06:120
289162810,2sleep028917-21seq21:14:400
172762810,2sleep017277-21chrt23:22:170
284072800,1sleep028408-21seq20:20:590
71612730,1sleep07163-21aten2.4_rfpower21:30:380
282392660,2sleep028240-21chrt23:39:040
54612650,1sleep05462-21switchtime21:27:240
299132650,1sleep029914-21seq22:04:310
313642634,9sleep031373-21/usr/sbin/munin21:17:350
181922610,2sleep018194-21cut20:05:260
95602600,2sleep09562-21latency19:50:480
36532600,2sleep03651-21basename00:40:010
194362560,3sleep019437-21chrt00:14:590
53092550,2sleep05310-21seq23:05:050
256282554,42sleep025651-21python320:16:270
297432543,6sleep029746-21ssh00:30:280
108062540,1sleep010808-21latency00:01:130
12232523,41sleep01159-21apt-get22:10:200
22742514,8sleep02280-21ssh23:48:400
213042495,36sleep021294-21ntpq00:17:080
270742480,2chrt27072-21/usr/sbin/munin00:26:000
23572484,36sleep02354-21ntpq20:31:200
15854904819,22cyclictest0-21swapper21:49:560
15854904818,23cyclictest0-21swapper23:29:060
65462474,35sleep06558-21ntpq19:45:520
178932470,2chrt17774-21apt-get22:35:290
15854904515,10cyclictest20123-21ntpq19:15:530
111632442,6sleep011149-21ssh22:25:140
1585490426,9cyclictest31552-21ntpq20:26:040
1585490424,19cyclictest16398-21df19:10:420
116952410,2chrt11696-21seq19:55:080
1585490405,17cyclictest30376-21runrttasks23:41:490
1585490404,11cyclictest26566-21ntp_states19:26:100
1585490395,27cyclictest25733-21munin-run21:10:010
1585490393,11cyclictest5350-21munin-run19:45:000
1585490384,27cyclictest13303-21chrt20:50:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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