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2026-11-10 - 23:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rack5slot7s.osadl.org (updated Tue Nov 10, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
22331224222187,93sleep00-21swapper07:06:550
227169916342,24cyclictest31899-21mailstats09:30:590
227169916231,21cyclictest17213-21munin-run11:20:010
227169915816,24cyclictest11362-21apt-get10:46:140
227169915715,23cyclictest5499-21apt-get10:11:320
22716991569,121cyclictest502-21sort09:40:050
227169915617,39cyclictest17208-21apt-get11:21:230
227169915616,117cyclictest10549-21munin-run10:40:020
227169915612,122cyclictest27067-21apt-get09:06:240
22716991559,122cyclictest26243-21cat09:00:010
227169915518,112cyclictest20880-21diskstats11:40:310
227169915510,28cyclictest27114-21latency_hist12:20:050
227169915429,36cyclictest0-21swapper10:41:010
227169915418,109cyclictest24887-21diskstats12:05:310
227169915415,115cyclictest23299-21munin-run07:20:030
227169915336,97cyclictest24548-21latency_hist08:00:050
227169915317,111cyclictest28093-21df12:25:240
227169915316,115cyclictest5501-21munin-run10:10:020
227169915315,25cyclictest9156-21df_inode10:30:290
227169915315,24cyclictest24160-21munin-run07:45:020
227169915312,25cyclictest2058-21apt-get09:51:390
227169915310,120cyclictest30798-21uname09:25:400
227169915216,114cyclictest7342-21munin-run10:20:030
227169915215,25cyclictest19946-21/usr/sbin/munin11:35:470
227169915132,99cyclictest23432-21apt-get07:25:120
227169915117,24cyclictest30475-21users09:21:040
227169915117,107cyclictest28988-21apt-get09:15:170
227169915116,25cyclictest28289-21df09:10:280
227169915110,118cyclictest25345-21dpkg08:30:080
227169915027,101cyclictest0-21swapper08:55:040
227169915017,27cyclictest15820-21/usr/sbin/munin11:10:350
227169915016,109cyclictest23983-21apt-get12:00:190
227169915015,93cyclictest14109-21apt-get11:00:180
227169915015,25cyclictest19393-21memory11:30:420
227169915013,24cyclictest2022-21users09:46:050
227169915012,99cyclictest27838-21unixbench_singl12:21:010
227169915012,23cyclictest13273-21ls10:55:050
227169914916,22cyclictest23434-21/usr/sbin/munin07:25:050
227169914915,36cyclictest28898-21diskstats12:30:300
227169914872,36cyclictest30290-21munin-run12:40:020
227169914819,26cyclictest22466-21df_inode11:50:280
227169914817,109cyclictest23160-21apt-get11:55:100
227169914811,115cyclictest26789-21zcat09:01:240
22716991479,116cyclictest24876-1kworker/u3:008:30:540
227169914726,95cyclictest8680-21fgrep10:25:550
227169914716,23cyclictest571-21apt-get09:40:190
227169914715,23cyclictest25154-21apt08:25:000
227169914714,26cyclictest18360-21/usr/sbin/munin11:25:270
227169914714,112cyclictest25015-21apt08:20:020
227169914710,113cyclictest7526-21ls10:20:240
227169914710,112cyclictest21869-21/usr/sbin/munin11:45:480
22716991469,25cyclictest4055-21/usr/sbin/munin10:00:200
227169914620,24cyclictest25884-21munin-run08:45:010
227169914615,106cyclictest25788-21cat08:40:050
227169914614,23cyclictest22844-21munin-node07:15:090
227169914614,111cyclictest3470-21grep09:55:550
227169914612,24cyclictest24448-21date07:55:050
227169914517,28cyclictest13943-21users10:56:050
227169914517,106cyclictest0-21swapper07:30:060
227169914513,23cyclictest24874-21kworker/u2:008:15:000
227169914512,112cyclictest24651-21latency_hist08:05:010
227169914511,28cyclictest25861-21/usr/sbin/munin12:10:460
227169914435,89cyclictest24023-21sendmail07:40:010
227169914311,109cyclictest15016-21df_inode11:05:300
227169914215,26cyclictest24315-21latency_hist07:50:040
227169914112,24cyclictest16882-21snmpd08:47:300
227169913716,22cyclictest16882-21snmpd08:07:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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