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2026-05-15 - 00:07

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 all highest latencies:
System rackfslot4s.osadl.org (updated Thu May 14, 2026 12:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3207321930,1sleep032074-21chrt07:05:110
705521230,2chrt7053-21ssh09:50:250
2105321220,2chrt21050-21ntpq08:30:510
3193621180,3chrt31930-21ntpq10:26:440
1498721180,2chrt14988-21runrttasks09:13:060
591121170,2chrt5912-21runrttasks09:47:590
2083021140,2sleep020831-21basename10:10:500
1363921140,2chrt13638-21seq10:00:070
1974321130,2chrt19745-21cut11:46:060
1085921130,3chrt10860-21seq11:32:240
1849421110,2sleep018495-21gcc10:06:470
3189121100,2chrt31892-21sleep07:56:050
2289121100,2sleep022892-21chrt07:41:240
996021090,2sleep09962-21fschecks_count09:05:340
303721090,2chrt3039-21vmstat08:01:300
211321090,2sleep02151-21runrttasks09:42:200
1475521090,2chrt14756-21chrt12:27:170
559921080,2sleep05600-21runrttasks12:13:560
1024621070,1sleep010247-21runrttasks10:42:580
1768321060,2chrt17682-21sshd07:33:530
2173521050,2sleep021737-21sshd12:37:540
1183321040,2chrt11834-21sleep07:24:510
3239221030,2chrt32395-21grep12:05:350
1513221010,2chrt15133-21chrt11:39:410
145022970,2sleep014503-21seq10:50:050
83922900,1sleep08394-21irqrtprio08:10:420
34972900,2sleep03499-21irqrtprio07:10:430
181242890,1sleep018127-21timerandwakeup12:32:190
304122860,2sleep030413-21ls10:25:040
242702860,2sleep024271-21chrt09:26:540
61702850,2sleep06171-21seq07:15:270
277472820,2sleep027748-21chrt11:10:040
183502800,2sleep018352-21cut07:35:220
113862790,1sleep011388-21cut09:56:120
83612780,2sleep08362-21seq11:29:210
254432780,2sleep025444-21chrt10:17:030
266932770,2sleep026694-21seq09:30:560
161812770,2sleep016180-21cut09:15:330
238912760,2sleep023892-21seq11:03:540
281222750,1sleep028123-21seq11:59:010
15442730,2sleep01545-21seq11:19:190
314592710,2sleep031460-21chrt12:04:020
260962690,1sleep026097-21chrt08:40:030
33082680,4chrt3305-21/usr/sbin/munin11:21:440
222962670,1sleep022297-21chrt09:24:300
245126111,40sleep02455-21sleep08:53:460
74152590,1sleep07419-21idleruntime-cro08:10:000
13752583,46sleep01378-21ssh10:30:200
324982574,44sleep032504-21ssh09:39:590
35142553,9sleep02917-21apt-get08:55:460
60702544,8sleep06063-21ntpq10:36:420
252592543,42sleep025245-21munin-run11:55:010
121702533,6sleep012176-21python308:16:240
78002524,39sleep07833-21ps09:01:250
306572523,42sleep030660-21ntpq08:46:190
275762520,2sleep027577-21seq07:50:070
184782520,1sleep018541-21cat08:26:290
151882520,4chrt15189-21fschecks_time10:50:500
99752510,3chrt9973-21/usr/sbin/munin12:20:370
305832500,1sleep030582-21seq11:14:040
195292500,2sleep019530-21chrt10:57:010
62662494,7sleep06271-21ssh12:15:160
245302483,35sleep024492-21apt-get07:45:170
184152460,1sleep018419-21chrt11:44:340
261590424,11cyclictest12082-21apt-get07:25:110
2615904218,17cyclictest15468-21/usr/sbin/munin08:21:300
2615903911,18cyclictest26245-21apt-get08:40:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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