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2025-09-19 - 13:11

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 Fri Sep 19, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2624621300,2chrt26248-21sendmail22:20:010
1512921210,3sleep015131-21irqrtprio23:56:060
2522821190,3chrt25229-21sleep23:15:590
1997621150,2chrt19979-21irqrtprio23:06:060
1151621150,3chrt11517-21sh22:51:070
3010221110,2chrt30103-21find00:22:140
1746221080,2chrt17451-21df00:00:380
732521060,2chrt7326-21sleep22:44:000
960121050,2chrt9602-21sleep19:44:220
238802900,2sleep023881-21cat00:11:460
244712890,2sleep024513-21awk19:10:000
227392880,1sleep022740-21apt-key00:10:070
320642860,1sleep032070-21irqrtprio00:26:060
77802850,2sleep07781-21rm23:42:200
2454790776,24cyclictest29197-21apt-get22:25:160
2454790776,10cyclictest26808-21df_inode22:20:440
24547907618,25cyclictest0-21swapper21:18:330
83132750,3sleep08311-21ld21:47:090
311782740,2sleep031179-21ssh21:30:390
24547907317,23cyclictest0-21swapper23:35:130
2454790724,10cyclictest27372-21telnet19:15:260
244322700,2sleep024434-21ls23:15:010
135332680,2sleep013532-21cut22:55:340
209962560,1sleep020997-21sh21:12:130
24547905019,24cyclictest0-21swapper19:26:270
18902500,3chrt1503-21http00:30:200
24547904918,23cyclictest0-21swapper22:37:560
215962490,3chrt21593-21/usr/sbin/munin22:11:040
60142480,1sleep06012-21hddtemp_smartct20:40:400
24547904818,22cyclictest0-21swapper21:24:250
24547904816,24cyclictest0-21swapper22:05:090
24547904717,23cyclictest0-21swapper21:59:370
24547904715,24cyclictest0-21swapper23:04:400
24547904619,20cyclictest0-21swapper22:04:320
24547904618,21cyclictest0-21swapper21:38:040
24547904617,22cyclictest0-21swapper00:19:460
24547904612,16cyclictest0-21swapper20:32:250
2454790456,19cyclictest17815-21df20:00:270
24547904517,9cyclictest1514-21ssh23:31:190
24547904516,22cyclictest0-21swapper23:54:590
24547904516,22cyclictest0-21swapper21:27:570
24547904415,13cyclictest0-21swapper23:29:430
24547904413,21cyclictest0-21swapper21:05:230
299482430,2chrt29940-21aten2.4-expect19:20:290
2454790435,11cyclictest9452-21apt-get21:51:050
2454790434,29cyclictest25314-21/usr/sbin/munin20:17:180
2454790434,19cyclictest8874-21irqstats20:45:440
2454790434,12cyclictest4594-21ssh21:41:040
24547904314,21cyclictest0-21swapper23:48:280
2454790426,28cyclictest5756-21ssh00:36:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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