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2025-12-05 - 12:02

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 Fri Dec 05, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1649921210,3chrt16039-21apt-get20:55:320
3179721180,3chrt31794-21/usr/sbin/munin00:17:100
1013421170,3chrt10137-21mailstats21:42:130
144721140,2chrt1449-21grep20:25:360
2899421130,3sleep029042-21sort23:15:040
1964221120,2sleep019643-21vmstat22:57:240
3046921100,2chrt30468-21cut21:21:070
110421050,3chrt1106-21sleep21:26:220
3055021010,2chrt30551-21sleep20:19:080
79372860,2sleep07935-21timerwakeupswit00:32:200
87922850,2sleep08793-21cat23:36:420
189242840,2sleep018926-21sort23:55:040
128382840,2sleep012867-21cut19:45:010
30082790,2sleep03010-21awk19:25:220
154662760,2sleep015463-21cat19:50:020
195812680,2sleep019583-21grep23:55:540
188542610,2sleep018855-21sh21:58:040
27630905622,13cyclictest4613-21ntpq00:26:320
155102560,2sleep015552-21cut22:50:500
27630905528,19cyclictest28380-21ssh21:17:190
27630905420,14cyclictest32049-21runrttasks22:21:420
27630905321,24cyclictest3261-21sh21:30:550
27630905320,24cyclictest0-21swapper00:35:390
27630905319,14cyclictest24433-21/usr/sbin/munin00:05:030
39162520,3sleep03911-21sshd22:30:270
27630905219,23cyclictest23866-21diskmemload00:21:410
27630905219,14cyclictest21238-21mailstats22:02:160
245272520,3chrt24525-21/usr/sbin/munin21:10:540
27630905128,13cyclictest3353-21ntpq23:26:200
27630905128,13cyclictest23866-21diskmemload23:46:420
27630905126,16cyclictest23603-21apt-get23:05:270
27630905122,12cyclictest27562-21kworker/u2:019:20:250
27630905121,20cyclictest25659-21/usr/sbin/munin20:10:420
27630905121,12cyclictest29955-21cut23:16:060
27630905120,22cyclictest3567-21ssh22:29:420
27630905120,21cyclictest5668-21/usr/sbin/munin21:35:540
27630905119,22cyclictest28027-21df00:11:040
27630905118,23cyclictest18063-21/usr/sbin/munin19:55:480
27630905118,13cyclictest23942-21ssh22:07:150
27630905117,24cyclictest31589-21ps20:20:430
27630905021,19cyclictest30034-21ssh22:18:180
27630905019,22cyclictest897-21sh21:01:040
27630905019,12cyclictest13586-21ntpq22:46:390
27630905018,23cyclictest11615-21/usr/sbin/munin20:45:370
27630905018,22cyclictest25206-21apt-get22:10:150
27630905017,15cyclictest20476-21apt-get23:01:080
27630904924,15cyclictest15537-21apt-get19:50:150
27630904924,15cyclictest13684-21apt-get20:50:260
27630904920,21cyclictest9580-21apt-get22:40:280
27630904918,22cyclictest6721-21apt-key22:35:120
27630904918,22cyclictest21790-21ntp_states20:01:180
27630904916,14cyclictest22523-21ntpq21:06:020
27630904828,13cyclictest8535-21latency_hist20:40:040
27630904825,15cyclictest542-21ssh23:21:180
27630904824,15cyclictest6203-21ntpq23:31:310
27630904824,14cyclictest7943-21apt-get19:35:200
27630904819,13cyclictest12421-21ntpq21:46:180
27630904817,23cyclictest0-21swapper00:07:410
27630904817,13cyclictest27750-21apt-get19:10:130
27630904815,13cyclictest15421-21ntp_states21:51:500
27630904725,14cyclictest12086-21ntpq23:41:520
27630904724,13cyclictest4540-21memory20:31:110
27630904717,22cyclictest24303-21ntp_states20:06:170
2619224710,21sleep026194-21ntpq19:05:490
27630904627,10cyclictest8633-21apt-get20:40:170
27630904616,12cyclictest31630-21python319:16:270
27630904615,13cyclictest6406-21ntpq19:30:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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