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2026-09-04 - 01:40

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 Thu Sep 03, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2897021250,3chrt28958-21apt-get09:20:120
767621170,2chrt7678-21aten2.4_rfpower10:25:330
67921170,2sleep0680-21latency_hist10:15:040
845321160,2chrt8454-21latency_hist11:15:040
523221160,2sleep05239-21uname10:21:130
2320021160,3chrt23199-21/usr/sbin/munin08:20:120
2252721160,2sleep022528-21seq10:47:080
1136621160,1sleep011365-21seq12:07:310
973721120,2sleep09740-21missed_timers11:16:140
1617221120,3chrt16173-21chrt09:49:360
2461021110,3chrt24611-21chrt11:39:110
2184521100,3chrt21846-21sleep08:16:520
1962221100,2chrt19623-21seq10:42:320
2747921090,2sleep027481-21sh07:35:260
2745421060,2chrt27457-21irqrtprio10:06:060
2919321050,2sleep029194-21sh10:57:080
3205721040,2chrt32058-21sleep12:39:060
1658221030,3chrt16583-21sh10:38:170
210512990,2sleep021052-21chrt07:25:140
16022940,2sleep01604-21chrt11:05:000
314222930,1sleep031424-21chrt11:49:350
165112920,3sleep016512-21fschecks_time12:15:520
231142910,2sleep023116-21sed10:00:050
121262890,2sleep012128-21rm11:20:320
8832880,2sleep0881-21date07:45:020
20452830,2sleep02046-21seq11:54:030
179722820,1sleep017973-21chrt07:20:170
4322810,1sleep0433-21tune2fs09:25:530
32902810,2sleep03291-21chrt08:40:030
187362810,3sleep018738-21latency_hist09:05:000
263392800,2sleep026337-21missed_timers11:41:140
169762780,2chrt16566-21apt-get08:10:120
138052780,2sleep013806-21chrt08:05:360
28852770,2sleep02887-21tail11:55:310
131452750,2sleep013147-21awk07:11:240
264342740,2sleep026435-21cat10:05:040
191522740,2sleep019153-21seq11:30:550
289052730,2sleep028906-21seq12:34:290
69792690,2sleep06981-21grep08:45:360
46932660,2sleep04694-21ntpq09:31:520
157232650,2sleep015724-21cut11:25:480
122632650,2sleep012264-21seq09:43:150
268392640,1sleep026841-21idleruntime08:25:400
36552630,2sleep03656-21cpu08:40:260
195802610,2sleep019581-21sh09:06:160
156182610,1sleep015611-21sh09:00:010
193332580,2sleep019330-21ssh09:54:110
270612570,1sleep027066-21seq10:54:230
140552570,1sleep014056-21ntpq12:11:460
91342560,2sleep09135-21chrt12:05:030
241922563,42sleep024196-21runrttasks07:30:220
200202553,41sleep019051-21apt-get12:21:040
82492534,40sleep08269-21wc09:37:170
114982533,43sleep011505-21gcc08:01:050
227402510,2sleep022741-21chrt12:25:140
14522513,40sleep01457-21hddtemp_smartct10:15:590
11560904813,9cyclictest0-21swapper09:18:480
121412473,34sleep012143-21ntpq10:31:300
952024510,18sleep09532-21ntpq07:05:390
160422443,34sleep016043-21ntp_states07:16:110
11560904320,16cyclictest0-21swapper08:50:330
11560904317,18cyclictest22243-21apt-get09:10:200
11560904311,8cyclictest7315-21runrttasks08:33:500
32372410,2sleep03241-21sed11:06:510
11560904119,15cyclictest0-21swapper07:55:210
11560904112,11cyclictest5642-21switchtime07:51:290
1156090404,17cyclictest1642-21sleep07:45:420
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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