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2026-09-06 - 15:09

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 the 50 highest latencies:
System rackfslot4s.osadl.org (updated Sun Sep 06, 2026 00:44:35)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2090121230,3chrt20902-21runrttasks22:32:070
1403521210,3chrt14013-21ntpq22:21:400
1396621180,2chrt13963-21users19:51:340
897721160,3chrt8978-21runrttasks23:02:520
2347321160,3chrt23465-21ps19:15:440
2721921150,3chrt26937-21apt-get21:06:030
3145321140,2chrt31454-21chrt22:00:040
1402221140,2chrt14021-21sleep20:44:520
393121080,2chrt3930-21ssh21:19:390
2565921070,2chrt25661-21ssh23:28:010
2424721070,2chrt24248-21runrttasks21:49:130
2470321050,2chrt24704-21sh00:15:390
731221040,2chrt7313-21sh22:11:340
294942970,2sleep029495-21chrt19:25:350
156422940,2sleep015641-21cat21:36:420
162422930,2sleep016244-21awk22:25:360
44382920,1sleep04439-21seq00:33:460
278642900,1sleep027865-21chrt20:15:150
242092900,2sleep024210-21chrt00:15:050
20752900,2sleep02078-21grep22:52:310
273092890,4chrt27281-21ntpq22:41:370
56132880,1sleep05614-21seq22:09:420
141082850,2sleep014110-21chrt21:34:370
250382790,2sleep025039-21chrt22:38:280
101402770,1sleep010141-21chrt23:53:480
151062760,2sleep015105-21awk23:12:130
62772750,2sleep06275-21fschecks_count19:40:350
177472750,2sleep017748-21chrt20:50:350
1951927410,50sleep019500-21munin-run19:10:020
92522730,2sleep09253-21chrt19:45:170
311532730,2sleep031155-21switchtime22:47:220
195232700,2sleep019524-21uname21:41:570
157642690,2sleep015765-21seq19:55:320
110212660,2sleep011023-21irqrtprio23:06:070
57132620,1sleep05714-21collect221:21:390
263692620,2sleep026372-21sort19:20:360
229442620,2sleep022945-21seq20:58:490
108002590,2sleep010801-21chrt20:40:030
93682580,3sleep09371-21seq22:15:290
287882580,1sleep028789-21chrt23:32:340
230222570,2sleep023023-21awk20:06:280
183232570,3sleep018309-21ssh00:06:120
55302520,1sleep05531-21cpu00:35:390
19546905219,24cyclictest0-21swapper23:44:460
42332500,2chrt4231-21/usr/sbin/munin22:56:030
19546905020,21cyclictest0-21swapper23:57:310
19546905017,23cyclictest27669-21apt-get00:20:150
19546905017,22cyclictest0-21swapper00:02:420
19546904923,19cyclictest30981-21apt-get20:20:120
19546904920,20cyclictest20029-21sshd23:20:070
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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