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2026-08-20 - 07:46

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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: 50 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot6s.osadl.org (updated Thu Aug 20, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
781223000,3sleep07815-21forks21:45:120
2073222550,2sleep020733-21sort22:35:150
1833421620,20sleep018335-21cat00:30:270
171121500,2sleep01712-21/usr/sbin/munin23:25:290
418821210,3chrt4186-21memory19:25:180
336221180,4chrt3363-21sshd23:33:290
2389421048,16sleep023895-21sshd22:45:550
3132821020,4sleep031335-21sendmail-mta19:05:160
2705421010,2sleep027056-21latency_hist23:00:020
184022988,14sleep018474-21wc22:25:230
130272970,3sleep012720-21/usr/sbin/munin00:10:240
324802950,3sleep032286-21/usr/sbin/munin23:20:170
25492950,3sleep02551-21cron19:20:000
103242956,11sleep010409-21latency_hist19:50:010
315022916,12sleep031570-21systemctl21:10:260
157402900,5sleep015808-21wc00:20:260
156492860,2sleep015650-21egrep20:10:110
171612856,11sleep017172-21ntp_states20:15:220
160042826,61sleep016063-21users22:15:280
245202796,62sleep024570-21df22:50:120
13622795,63sleep01366-21df_inode21:20:150
103072790,3sleep010356-21awk21:55:130
249922777,59sleep025026-21proc_pri20:45:230
32468996219,15cyclictest95032chrt23:55:590
32468996134,17cyclictest14058-21/usr/sbin/munin00:15:120
3246899608,18cyclictest32573-21/usr/sbin/munin19:10:260
32468996036,14cyclictest26489-21/usr/sbin/munin20:50:260
32468995933,16cyclictest27408-21/usr/sbin/munin20:55:160
32468995918,14cyclictest11621-21latency_hist19:55:010
32468995915,17cyclictest307-21munin-node20:20:130
32468995911,14cyclictest3677-21/usr/sbin/munin23:35:190
32468995910,18cyclictest410-21runrttasks21:15:260
32468995835,15cyclictest19227-21/usr/sbin/munin00:35:120
32468995832,15cyclictest11867-21/usr/sbin/munin22:00:190
32468995823,13cyclictest7845-21ntpq23:50:220
32468995814,15cyclictest1-21systemd20:33:260
32468995810,20cyclictest22399-21ntpq20:35:230
32468995810,14cyclictest4160-21ntp_states21:30:240
3246899579,19cyclictest6565-21ntp_states23:45:230
3246899578,18cyclictest31250-21ntp_states23:15:210
3246899578,16cyclictest2714-21/usr/sbin/munin19:20:200
3246899577,18cyclictest6460-21/usr/sbin/munin21:40:280
32468995736,13cyclictest23890-21/usr/sbin/munin20:40:260
32468995726,23cyclictest31054-21latency_hist21:10:000
32468995712,18cyclictest28863-21/usr/sbin/munin21:00:220
32468995710,17cyclictest19491-21/usr/sbin/munin20:25:290
32468995710,14cyclictest5720-21mailstats19:30:240
3246899569,17cyclictest288-21snmpd19:41:260
3246899569,15cyclictest13320-21/usr/sbin/munin22:05:270
3246899568,16cyclictest11884-21cat19:55:160
3246899567,16cyclictest13124-21ls20:00:170
32468995632,16cyclictest29951-21/usr/sbin/munin23:10:180
32468995632,15cyclictest14965-21runrttasks22:11:520
32468995631,16cyclictest2898-21/usr/sbin/munin21:25:240
32468995618,15cyclictest11873-21mailstats00:05:270
3246899559,15cyclictest17936-21seq22:24:580
3246899559,14cyclictest5149-21/usr/sbin/munin21:35:250
3246899557,18cyclictest21949-21/usr/sbin/munin22:40:170
32468995531,15cyclictest5241-21/usr/sbin/munin23:40:200
32468995530,16cyclictest9737-21runrttasks21:51:210
32468995510,15cyclictest17769-21munin-run00:30:010
32468995510,14cyclictest27304-21memory23:00:180
3246899549,15cyclictest10153-21/usr/sbin/munin00:00:350
3246899549,13cyclictest6560-21/usr/sbin/munin19:35:130
3246899548,15cyclictest288-21snmpd23:07:090
3246899547,14cyclictest19360-21/usr/sbin/munin22:30:160
32468995417,13cyclictest15578-21cut20:10:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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