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2026-09-16 - 06:06

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 Wed Sep 16, 2026 00:44:01)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
370722510,3sleep03704-21cat20:30:200
2513522230,2sleep025136-21readlink00:00:000
2106421550,3sleep021063-21vmstat19:30:300
2362221220,2sleep023624-21wc19:40:280
1403121210,3chrt14033-21fgrep23:15:270
753421200,3sleep07530-21ps22:50:240
3239221110,3sleep031914-21/usr/sbin/munin22:20:260
2142221090,3sleep021449-21awk21:40:010
302782970,4sleep030306-21sendmail00:20:000
112712950,3sleep011326-21ntpq23:05:200
221012920,3sleep022103-21awk21:40:280
203422905,12sleep020384-21latency_hist19:30:020
64812870,4sleep06532-21mailstats20:40:270
324062870,3sleep032063-21/usr/sbin/munin20:15:250
269572870,3sleep027021-21mailstats00:05:260
310292860,3sleep031093-21sed22:15:280
298422840,3sleep029907-21sendmail_mailst20:05:270
280872845,66sleep028114-21ntpq00:10:180
163292760,3sleep016331-21latency_hist21:20:020
48762750,3sleep04875-21tr22:40:190
1514127520,33sleep015166-21munin-run19:10:000
71302720,3sleep07127-21cat22:50:020
1518899668,24cyclictest15291-21/usr/sbin/munin19:10:120
15188996634,23cyclictest1014-21/usr/sbin/munin20:20:170
15188996533,22cyclictest19261-21/usr/sbin/munin21:30:210
1518899598,18cyclictest31724-21/usr/sbin/munin00:25:270
1518899598,16cyclictest24199-21df21:50:130
15188995928,23cyclictest26427-21runrttasks21:58:430
15188995911,16cyclictest8862-21/usr/sbin/munin22:55:290
1518899589,16cyclictest21393-21/usr/sbin/munin23:45:200
1518899589,15cyclictest29314-21/usr/sbin/munin22:10:150
1518899588,17cyclictest18803-21/usr/sbin/munin23:35:270
1518899588,16cyclictest10039-21ntpq23:00:180
1518899586,19cyclictest2209-21/usr/sbin/munin20:25:160
15188995834,16cyclictest27434-21/usr/sbin/munin19:55:300
15188995810,17cyclictest4771-21/usr/sbin/munin20:35:270
1518899579,17cyclictest25840-21/usr/sbin/munin19:50:190
1518899578,17cyclictest23266-21find21:45:250
1518899578,17cyclictest17519-21/usr/sbin/munin23:30:200
1518899578,16cyclictest13823-21/usr/sbin/munin21:10:280
1518899578,15cyclictest11506-21ntpq21:00:240
15188995734,15cyclictest29328-21runrttasks20:04:410
15188995733,16cyclictest30428-21runrttasks00:20:030
15188995733,15cyclictest2425-21/usr/sbin/munin00:35:300
15188995724,23cyclictest114-21systemd-journal23:26:370
15188995710,16cyclictest22004-21ntpq19:35:190
1518899569,18cyclictest17754-21munin-run19:20:000
1518899569,16cyclictest307-21munin-node20:50:110
1518899569,15cyclictest3301-21/usr/sbin/munin22:35:130
1518899568,15cyclictest30785-21/usr/sbin/munin20:10:300
1518899567,17cyclictest25271-21/usr/sbin/munin00:00:280
1518899567,16cyclictest14946-21/usr/sbin/munin23:20:270
1518899567,15cyclictest24624-21ntp_states19:45:240
15188995633,15cyclictest18151-21/usr/sbin/munin19:20:200
15188995633,15cyclictest1009-21/usr/sbin/munin22:25:190
15188995632,15cyclictest10075-21/usr/sbin/munin20:55:170
15188995631,17cyclictest23867-21latency_hist23:55:010
15188995630,16cyclictest17281-21runrttasks21:22:310
15188995630,16cyclictest1028-21/usr/sbin/munin00:30:290
15188995610,17cyclictest3187-21modprobe22:35:010
15188995610,16cyclictest20547-21sendmail_mailtr23:40:250
1518899558,21cyclictest28039-21wc22:05:100
1518899558,14cyclictest12346-21/usr/sbin/munin23:10:270
15188995530,16cyclictest27090-21/usr/sbin/munin22:00:270
15188995530,16cyclictest18420-21runrttasks21:26:210
15188995410,14cyclictest7510-21irqstats20:45:170
15188995333,13cyclictest12717-21runrttasks21:05:180
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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