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2026-07-30 - 09:03

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 Thu Jul 30, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
225722870,3sleep02253-21cat22:25:270
367322470,3sleep03674-21cat20:25:260
2721522230,3sleep027213-21grep19:50:290
2552121530,2sleep025522-21ls23:55:290
1601321430,3chrt16008-21munin-run21:15:000
1755321380,2sleep017549-21latency_hist19:15:020
3132721260,3chrt31329-21modprobe00:20:000
878421230,4chrt8775-21timerwakeupswit22:50:280
2526521220,4chrt25266-21latency_hist19:45:020
1745821190,3chrt17459-21egrep21:20:110
1121721180,4chrt11215-21awk20:55:190
2843921050,4sleep028511-21/usr/sbin/munin19:55:280
2398121036,13sleep023898-21/usr/sbin/munin21:45:160
827521020,3sleep08323-21latency_hist20:45:020
3102521020,3sleep031023-21grep20:05:270
2674121000,2sleep026739-21grep00:00:290
173722968,11sleep017407-21irqstats23:25:150
100332945,10sleep010090-21users22:55:320
55542920,2sleep05556-21latency_hist22:40:010
21812905,11sleep02183-21users00:30:300
189592895,9sleep019025-21/usr/sbin/munin23:30:250
157752880,4sleep015776-21sshd19:06:470
1621299629,19cyclictest18737-21/usr/sbin/munin21:25:260
16212996212,18cyclictest14951-21ntp_states23:15:220
16212996111,16cyclictest3052-21/usr/sbin/munin22:30:280
16212996036,15cyclictest11094-21/usr/sbin/munin23:00:230
16212996016,14cyclictest29507-21runrttasks22:05:240
1621299599,17cyclictest13557-21/usr/sbin/munin21:05:190
16212995933,16cyclictest31992-21/usr/sbin/munin20:10:170
16212995932,18cyclictest10268-21/usr/sbin/munin20:50:300
16212995910,16cyclictest16028-21grep23:20:110
1621299589,16cyclictest482-21/usr/sbin/munin22:20:250
1621299588,18cyclictest307-21munin-node23:40:080
16212995834,15cyclictest20163-21/usr/sbin/munin23:35:250
16212995834,14cyclictest5905-21/usr/sbin/munin22:40:210
16212995830,16cyclictest25951-21/usr/sbin/munin19:45:280
16212995822,27cyclictest31919-21/usr/sbin/munin22:15:220
16212995822,12cyclictest6128-21pluginstate20:35:270
317692570,2sleep031770-21sh00:20:220
1621299578,17cyclictest20387-21memory19:25:180
1621299578,16cyclictest22766-21grep19:35:110
1621299578,16cyclictest22699-21chrt23:45:200
1621299578,14cyclictest29480-21/usr/sbin/munin00:10:300
1621299577,18cyclictest21300-21/usr/sbin/munin21:35:130
16212995710,16cyclictest22614-21/usr/sbin/munin21:40:190
1621299569,18cyclictest12265-21/usr/sbin/munin21:00:180
1621299569,16cyclictest19323-21sendmail_mailst19:20:260
1621299568,15cyclictest16128-21/usr/sbin/munin21:15:090
1621299567,16cyclictest4567-21chrt20:30:110
16212995633,15cyclictest9342-21runrttasks20:48:230
16212995631,16cyclictest32765-21/usr/sbin/munin00:25:100
16212995630,16cyclictest12450-21/usr/sbin/munin23:05:250
16212995610,14cyclictest28283-21/usr/sbin/munin22:00:270
1621299559,16cyclictest24469-21sshd23:51:470
1621299559,14cyclictest25173-21/usr/sbin/munin21:50:140
1621299559,14cyclictest21772-21ntp_states19:30:220
1621299559,12cyclictest286702sleep000:09:260
1621299558,15cyclictest4032-21chrt00:40:000
1621299558,15cyclictest2133-21memory20:20:170
1621299558,14cyclictest8093-21awk22:50:000
1621299557,16cyclictest20068-21df21:30:110
16212995532,15cyclictest673-21/usr/sbin/munin20:15:120
16212995530,15cyclictest29370-21/usr/sbin/munin20:00:150
1621299549,14cyclictest30489-21irqstats22:10:170
1621299548,15cyclictest17600-21/usr/sbin/munin19:15:220
1621299548,14cyclictest13663-21ntp_states23:10:210
1621299528,14cyclictest26543-21/usr/sbin/munin21:55:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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