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2026-04-04 - 01:48

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 Fri Apr 03, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3061221260,3sleep030614-21ld11:46:410
77321230,2chrt740-21ssh11:02:150
2863521200,2chrt28631-21ps10:07:150
2050121200,2chrt20502-21sleep10:43:090
169221190,2chrt1689-21ld11:52:070
1391221180,2sleep013915-21seq08:05:140
168321170,3chrt1684-21seq10:15:530
2615921160,3chrt26160-21runrttasks12:29:030
573521150,1sleep05733-21ls10:21:150
2525421150,1sleep025255-21runrttasks11:39:060
1975121150,3chrt19752-21awk11:30:570
3060521140,2chrt30606-21ntp_offset09:21:430
1761621140,2chrt17615-21/usr/sbin/munin11:27:190
685321110,2chrt6854-21sleep09:35:220
2953321110,2chrt29531-21ld10:56:410
1883421090,3chrt18833-21seq12:17:490
1564121050,2chrt15646-21modprobe09:00:000
1295921050,3chrt12960-21ssh12:09:400
287522990,2chrt28753-21sh09:19:370
47512970,1sleep04752-21ld11:56:380
51552960,1sleep05156-21runrttasks11:09:030
119562950,2sleep011957-21sshd07:10:120
228002910,2sleep022801-21chrt10:46:310
137312860,3chrt13261-21apt-get09:45:220
204792850,2sleep020477-21aten2.4_rfpower09:55:340
48332840,2sleep04834-21chrt09:31:530
195312790,2sleep019532-21chrt09:53:490
278162770,1sleep027817-21run-parts08:26:250
199202750,2sleep019924-21chrt08:15:000
106782750,2sleep010677-21ls08:00:030
86092720,2sleep08610-21chrt12:02:210
95562710,2sleep09558-21sed10:27:050
279512650,2sleep027952-21seq11:42:330
67792640,1sleep06780-21irqrtprio11:11:060
273612640,2sleep027362-21chrt07:35:050
56212630,2sleep05622-21collect207:50:520
20012620,1sleep02002-21chrt07:45:380
325022563,43sleep032448-21apt-get09:25:190
296902540,2sleep029691-21runrttasks12:34:350
213652540,1sleep021369-21sed12:21:500
125582544,7sleep012545-21munin-run08:55:010
191662532,41sleep07315-21runrttasks09:05:130
162612533,41sleep016249-21ntpq10:36:430
306872523,7sleep030692-21sh12:35:530
257922520,2sleep025793-21runrttasks10:02:520
32522513,38sleep03255-21runrttasks08:40:210
189442512,7sleep018948-21sleep09:04:570
100462512,5sleep010031-21ssh09:40:070
92262500,2sleep09269-21aten2.4_rfpower11:15:320
7872500,1sleep0791-21irqrtprio08:35:430
238832500,2chrt23879-21/usr/sbin/munin09:12:000
126162503,7sleep012644-21tr10:31:470
113332503,7sleep010782-21/usr/sbin/munin08:00:400
248262490,2sleep024830-21runrttasks10:50:200
879624810,24sleep08801-21apt-get07:05:120
155292483,35sleep015557-21perl07:15:370
141082470,2sleep014109-21ld11:22:100
316842463,35sleep031699-21/usr/sbin/munin10:11:490
212422462,35sleep021254-21ntpq08:16:010
149062462,37sleep014915-21ssh12:12:000
11812904620,19cyclictest412-21snmpd08:30:490
66332450,4sleep06634-21df08:45:290
11812904521,18cyclictest412-21snmpd07:20:310
280022443,34sleep027310-21apt-get07:36:030
1181290425,18cyclictest31803-21memory07:40:490
1181290414,9cyclictest22507-21ntpq07:26:080
11812904114,8cyclictest24464-21ntpq08:21:090
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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