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2026-06-08 - 15:07

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 50 highest latencies:
System rackfslot4s.osadl.org (updated Mon Jun 08, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
444721270,3chrt3803-21/usr/sbin/munin21:50:540
2776021190,3chrt27735-21ntpq21:36:460
52121180,3chrt522-21rm23:22:040
2145321180,2chrt21391-21apt-get19:45:200
423821170,2chrt4239-21sleep00:16:100
710521150,1sleep07104-21seq22:43:330
3011921130,3chrt30117-21sendmail_mailst23:18:020
2684321110,4chrt26844-21sh23:13:070
2226421110,1sleep022265-21chrt23:06:110
1117121110,1sleep011172-21cat22:01:000
2628521100,3chrt26286-21sleep22:23:360
2508221090,2chrt25083-21sleep20:42:210
2499221090,2chrt24993-21chrt23:59:020
2530821080,4chrt25309-21runrttasks21:33:100
1611721080,2chrt16118-21sleep22:56:570
1180821070,2sleep011809-21seq19:30:050
672021060,2chrt6721-21sleep20:13:120
162721040,2chrt1628-21runrttasks20:05:260
209821030,2chrt2099-21sh00:13:030
25562980,1sleep02557-21seq21:47:300
275072970,2sleep027509-21sh00:02:350
160182950,2sleep016019-21seq21:20:010
161812870,2sleep016182-21chrt21:20:110
88932860,2sleep08894-21seq21:57:220
169592860,2sleep016960-21chrt20:30:210
114372840,2sleep011438-21sh00:27:070
319562830,2sleep031957-21chrt00:09:470
156442820,2sleep015642-21awk23:45:160
143182780,2sleep014319-21chrt20:25:380
227642770,2sleep022765-21chrt22:18:090
44652750,2sleep04466-21wc22:40:050
265252720,2sleep026526-21awk20:45:260
207872720,1sleep020791-21sed20:35:450
169102720,2sleep016914-21idleruntime-cro22:10:000
85032710,2sleep08504-21ssh23:34:410
62262710,2sleep06227-21chrt21:05:150
280192710,2sleep028021-21cut22:26:050
11932710,2sleep01194-21chrt20:05:000
118902700,2sleep011887-21hddtemp_smartct22:50:570
108222690,2sleep010823-21ssh22:49:300
149892680,1sleep014990-21chrt19:35:170
119142650,2sleep011915-21ld20:21:090
197572640,1sleep019758-21cat21:25:220
856626010,41sleep08593-21runrttasks20:15:520
116812590,2sleep011683-21seq23:39:220
116652580,1sleep011666-21chrt21:13:080
324982552,43sleep032549-21aten2.4_rfpower20:55:230
6412520,1sleep0642-21chrt22:34:000
312782518,32sleep00-21swapper19:08:570
194482510,2sleep019442-21sshd00:39:490
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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