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2026-08-10 - 04:16

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 Aug 10, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2684421290,2chrt26847-21latency_hist23:20:090
1112521270,3chrt11126-21sleep22:56:190
3235221220,2chrt32349-21ntpq00:16:180
1494921220,2chrt14945-21df_inode23:50:400
941621200,2chrt9417-21if_err_eth100:31:010
908121180,2chrt9082-21aten2.4_rfpower22:05:330
1998621170,2sleep019988-21latency_hist23:10:070
1883921160,2chrt18835-21sshd19:48:310
715421140,2chrt7153-21seq19:30:130
1815321130,2sleep018152-21basename21:30:360
2914321110,1sleep029146-21aten2.4_rfpower22:35:310
441321100,2chrt4415-21apt-key21:10:110
300121100,2chrt3003-21processes23:32:140
2925721090,2chrt29259-21modprobe20:05:310
1697121080,3chrt16972-21sh21:28:110
3256421070,2sleep032566-21cut22:40:330
3271221060,2chrt32713-21seq19:18:420
792721050,2chrt7928-21sleep22:03:060
2588921050,2chrt25890-21sh20:51:250
42072990,2sleep04212-21sed22:46:080
270652980,2sleep027066-21chrt22:31:390
121992980,2sleep012200-21basename20:30:250
36752970,2sleep03676-21chrt00:22:040
301002930,2sleep030101-21chrt23:24:480
245892930,2sleep024588-21seq00:05:240
123212930,2sleep012322-21chrt22:10:190
283412890,2sleep028342-21tune2fs00:10:490
89392860,2sleep08940-21chrt20:25:220
124512800,2sleep012455-21aten2.4_rfpower00:35:500
285892790,2sleep028592-21fschecks_time21:45:550
39382770,2sleep03940-21grep19:25:030
218112770,2sleep021812-21tune2fs21:35:510
2520027511,50sleep025209-21ntpq19:06:110
17462750,2sleep01744-21tune2fs21:05:350
142862750,2sleep014287-21seq23:49:540
159492740,2sleep015950-21seq23:03:310
30582730,1sleep03061-21grep21:56:040
229982710,2sleep022999-21chrt19:55:290
143212710,1sleep014323-21cat19:40:490
278372700,1sleep027842-21seq21:45:020
319512650,2sleep031952-21seq20:10:040
75582630,2sleep07559-21seq00:27:500
60492590,2sleep06051-21ntp_offset23:36:460
31152590,2sleep03117-21grep20:15:350
12892570,1sleep01290-21seq21:53:160
312482553,7sleep031298-21seq21:00:430
276842543,41sleep027738-21cut20:55:290
220992540,2sleep022109-21chrt23:12:400
80332532,5sleep08025-21ssh23:40:320
83502512,7sleep08340-21ssh22:52:180
227912512,40sleep022793-21ssh00:02:020
27032904920,22cyclictest0-21swapper23:29:190
27032904917,24cyclictest0-21swapper22:23:530
228532482,7sleep022925-21sleep20:46:290
154442470,2chrt15441-21/usr/sbin/munin20:35:330
27032904618,21cyclictest0-21swapper21:19:470
198312460,1sleep019833-21find23:57:440
107902463,7sleep010798-21smartctl19:35:440
271602452,34sleep027167-21apt-get19:10:120
185692450,3sleep018564-21sshd22:19:330
2703290444,12cyclictest25483-21latency_hist22:30:040
27032904420,17cyclictest412-21snmpd21:24:020
197462432,34sleep019807-21aten2.4-expect19:50:260
27032904116,16cyclictest18404-21aten2.4_rfpower20:40:260
2703290404,9cyclictest5009-21memory19:25:480
27032904012,19cyclictest5967-21aten2.4_rfpower20:20:250
27032903914,18cyclictest26725-21irqstats20:00:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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