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2026-08-23 - 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 792 highest latencies:
System rackfslot4s.osadl.org (updated Sun Aug 23, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
712021150,2chrt7121-21/usr/sbin/munin23:42:110
68721140,2chrt688-21fschecks_count21:55:500
3167521140,3chrt31676-21sleep22:41:380
2151321140,2chrt21508-21python321:38:020
1083821140,3chrt10830-21apt-get19:40:110
680321130,3chrt6804-21sleep20:25:440
1222521130,2sleep012228-21cut23:01:070
1494821120,1sleep014950-21cpu23:05:380
1105121120,2sleep011052-21ntp_offset21:22:370
3144421110,1sleep031445-21chrt00:18:440
3028821090,2chrt30292-21sed21:51:060
1597021080,3chrt15973-21sendmail20:40:010
2525021010,1sleep025252-21chrt21:43:410
121172990,2sleep012118-21cat22:12:160
288062980,2sleep028807-21chrt21:49:160
70932970,2sleep07094-21awk22:05:190
201702970,2sleep020172-21sort22:25:040
213962940,1sleep021395-21seq19:05:190
147872930,1sleep014788-21seq21:27:550
27302890,2sleep02731-21chrt22:47:010
65002870,1sleep06496-21aten2.4_rfpower00:30:320
56572870,1sleep05659-21if_err_can022:51:480
13612870,3sleep01362-21seq23:33:480
259052860,2sleep025906-21sh22:33:030
244822840,2sleep024483-21chrt19:10:160
28372830,2sleep02838-21seq19:26:260
277512810,1sleep027753-21sort00:13:070
18032800,1sleep01804-21seq00:22:290
155212800,2sleep015523-21switchtime22:17:190
216292790,2sleep021630-21chrt22:26:300
59032770,2sleep05904-21run-parts19:31:240
224082750,2sleep022409-21chrt20:50:220
326452740,2sleep032646-21chrt20:15:180
61662730,2sleep06167-21seq21:15:470
119172730,2sleep011918-21ls23:50:040
248082710,2sleep024809-21hostname23:20:340
259752670,2sleep025976-21seq20:55:390
202402660,2sleep020241-21chrt00:01:500
42232620,1sleep04224-21seq21:12:280
106512580,2sleep010653-21chrt22:59:030
284272550,2sleep028429-21fschecks_count23:25:500
183822550,1sleep018381-21seq21:33:350
134382550,2sleep013439-21seq23:51:360
199222544,9sleep019925-21sshd23:12:260
197662533,9sleep019773-21chrt20:45:380
75532503,7sleep07541-21apt-get19:35:150
233402500,1sleep023341-21sh00:06:280
112732490,1sleep011274-21collect200:36:590
24315904719,21cyclictest0-21swapper23:38:350
24315904718,22cyclictest0-21swapper23:17:330
24315904616,22cyclictest0-21swapper22:04:310
177432440,2chrt17744-21runrttasks23:58:140
2431590434,27cyclictest16153-21/usr/sbin/munin20:40:290
24315904313,23cyclictest0-21swapper00:28:330
2431590425,12cyclictest29835-21df20:10:290
2431590425,11cyclictest28528-21memory19:15:500
24315904215,20cyclictest17640-21if_can019:50:400
2431590415,28cyclictest14492-21hddtemp_smartct19:45:370
2431590415,18cyclictest32658-21memory21:05:500
2431590415,17cyclictest24407-21ntpq20:00:590
2431590414,19cyclictest21208-21ntpq19:55:500
24315904119,15cyclictest0-21swapper21:00:250
24315904114,11cyclictest26751-21sh20:05:290
2431590404,18cyclictest28530-21ntp_states22:37:000
24315904015,9cyclictest10011-21sshd20:30:260
2431590393,10cyclictest30985-21/usr/sbin/munin19:20:250
2431590386,12cyclictest4249-21memory20:20:470
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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