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2026-04-17 - 04:14

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 17, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2883521420,2sleep028836-21cat21:26:010
2229321310,4chrt20998-21/usr/sbin/munin23:41:270
350921240,3chrt3508-21seq19:55:320
2604021220,3chrt26042-21processes23:47:110
1821621220,2chrt18217-21sleep20:18:370
1984321190,2sleep019845-21cat22:01:030
1334621180,2chrt13334-21ntp_states00:16:520
332221140,2sleep03321-21seq22:25:000
2414621140,2chrt24148-21sleep22:07:140
1934221140,3chrt19343-21runrttasks22:48:330
1783721140,1sleep017855-21runrttasks21:10:040
77621130,2sleep0777-21runrttasks23:09:570
2642921130,3chrt26430-21chrt21:22:140
1034321130,2chrt10341-21memory20:05:460
2093721120,2sleep020938-21chrt21:14:310
812821090,2chrt8130-21grep19:10:350
2373821090,2chrt23739-21ps00:32:170
1906621090,2chrt19054-21ntpq23:36:400
2113121060,2chrt21132-21sh00:28:280
151721060,2chrt1518-21sleep20:42:580
690021050,2chrt6901-21runrttasks23:18:410
136421020,1sleep01365-21chrt23:59:240
766121010,2chrt7662-21sh20:52:480
287292950,2sleep028730-21seq19:43:380
3132920,2sleep0317-21cpu19:50:250
127202880,2sleep012722-21runrttasks22:38:390
258922870,2sleep025893-21chrt00:35:510
159882850,2sleep015991-21seq21:55:360
534928411,56sleep05410-21memory19:05:370
179172830,1sleep017918-21chrt00:24:080
69232810,3chrt6895-21ntpq21:41:210
225052810,2sleep022506-21runrttasks21:16:150
255032780,1sleep025501-21users22:57:250
19822780,2sleep01983-21aten2.4-expect00:00:300
19172780,2sleep01919-21cut23:11:030
122312770,2sleep012232-21chrt23:26:190
285512760,2sleep028552-21seq22:14:070
246312740,2sleep024633-21chrt19:36:230
305472710,1sleep030546-21ld22:16:460
125602700,2sleep012561-21irqrtprio21:00:400
145412680,1sleep014539-21basename23:30:310
153522650,2sleep015353-21grep22:42:160
294322600,2sleep029434-21runrttasks19:45:150
56232593,46sleep05618-21ssh00:05:480
288082597,41sleep026925-21munin-node23:51:180
222652583,45sleep021861-21apt-get20:25:120
78892570,3sleep07859-21ssh22:31:070
67612550,2sleep06763-21wc22:30:050
209142543,7sleep020957-21irqstats19:30:440
81012532,7sleep08097-21df23:20:400
5572534,41sleep0553-21ntpq21:32:040
105022532,43sleep010489-21ntpq21:46:480
220372490,2chrt22035-21/usr/sbin/munin22:52:240
7514904719,21cyclictest0-21swapper23:00:100
54952470,2sleep05496-21chrt21:40:020
7514904618,21cyclictest0-21swapper21:53:400
7514904416,22cyclictest0-21swapper20:01:330
7514904416,21cyclictest0-21swapper00:11:040
7514904416,10cyclictest16968-21/usr/sbin/munin19:26:060
281582430,2sleep028157-21seq20:34:430
751490426,19cyclictest28684-21apt-get20:35:240
751490415,9cyclictest3680-21ntpq20:46:100
7514904016,17cyclictest20273-21seq20:21:210
751490398,12cyclictest9718-21ntpq20:55:560
751490395,27cyclictest13503-21ntpq20:10:500
751490394,16cyclictest412-21snmpd19:22:190
751490385,27cyclictest11963-21ntpq19:16:080
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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