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2026-07-21 - 05:57

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 792 highest latencies:
System rack4slot6s.osadl.org (updated Tue Jul 21, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1552122410,3sleep015523-21switchtime21:40:290
71022140,3sleep0709-21latency_hist20:45:000
780421690,2sleep07807-21sort21:10:280
2813121390,2sleep028128-21grep00:35:250
525521360,4chrt5253-21users21:00:290
2344221350,3sleep023440-21threads20:05:290
178021240,4chrt1773-21munin-run22:55:010
1114721140,4sleep011172-21munin-run19:20:010
1394221020,4sleep014005-21mailstats23:40:250
1182821000,3sleep011827-21awk19:20:270
186732960,3sleep018669-21latency_hist00:00:020
309302950,2sleep030926-21ntpq20:35:220
271282894,9sleep026631-21/usr/sbin/munin22:25:290
69442860,3sleep07001-21latency_hist23:15:020
8609997627,16cyclictest12880-21/usr/sbin/munin19:25:230
137542754,8sleep013757-21df21:35:140
89042730,2sleep08903-21timerandwakeup23:20:290
858327317,33sleep08598-21wc19:10:010
193402680,3sleep019388-21wc19:50:260
100882650,2sleep010091-21tr23:25:260
860999639,20cyclictest20803-21sshd00:07:150
8609996114,23cyclictest29848-21switchtime20:30:240
8609996034,17cyclictest28215-21/usr/sbin/munin22:30:240
860999598,18cyclictest20604-21ntp_states19:55:210
8609995933,16cyclictest6036-21/usr/sbin/munin21:05:150
92252580,3sleep09223-21grep19:10:260
860999589,17cyclictest30377-21sendmail22:40:010
860999589,14cyclictest106202sleep021:21:500
860999588,19cyclictest21627-21/usr/sbin/munin20:00:170
8609995834,15cyclictest15410-21/usr/sbin/munin23:45:290
8609995820,11cyclictest16658-21timerwakeupswit23:50:290
860999579,16cyclictest12419-21/usr/sbin/munin21:30:160
860999579,15cyclictest4269-21sshd23:04:150
860999579,15cyclictest24027-21/usr/sbin/munin22:15:140
860999579,15cyclictest17752-21/usr/sbin/munin19:45:190
860999578,16cyclictest25488-21/usr/sbin/munin20:15:160
860999578,16cyclictest11136-21/usr/sbin/munin21:25:190
8609995733,16cyclictest21738-21/usr/sbin/munin22:05:200
8609995718,15cyclictest173052chrt19:42:230
8609995710,18cyclictest16357-21df_inode21:45:140
8609995710,15cyclictest16356-21modprobe19:40:010
860999568,16cyclictest4544-21grep23:05:130
860999568,15cyclictest18058-21/usr/sbin/munin21:50:280
860999568,14cyclictest22747-21munin-node22:10:110
860999567,17cyclictest24202-21/usr/sbin/munin20:10:250
8609995633,14cyclictest27322-21/usr/sbin/munin20:20:290
8609995632,15cyclictest834-21runrttasks20:45:120
8609995631,16cyclictest30569-21df_inode22:40:140
8609995630,17cyclictest19192-21/usr/sbin/munin21:55:260
8609995624,23cyclictest2062-21/usr/sbin/munin22:55:190
8609995610,14cyclictest26440-21/usr/sbin/munin00:30:180
860999559,13cyclictest18695-21/usr/sbin/munin00:00:190
860999558,16cyclictest23878-21/usr/sbin/munin00:20:320
860999558,15cyclictest13402-21systemctl23:40:000
860999557,17cyclictest7059-21/usr/sbin/munin23:15:270
860999557,16cyclictest28086-21/usr/sbin/munin20:25:110
860999557,16cyclictest25158-21/usr/sbin/munin00:25:280
8609995532,15cyclictest23478-21runrttasks00:18:030
8609995532,15cyclictest22399-21runrttasks00:14:490
8609995531,15cyclictest8680-21irqstats21:15:170
8609995530,16cyclictest11087-21/usr/sbin/munin23:30:160
8609995529,16cyclictest397-21runrttasks22:49:230
8609995516,12cyclictest2346-21awk20:50:210
860999549,15cyclictest3417-21df_inode20:55:150
8609995431,14cyclictest25417-21/usr/sbin/munin22:20:150
860999539,15cyclictest20751-21timerwakeupswit22:00:290
860999538,14cyclictest13877-21/usr/sbin/munin19:30:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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