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2025-12-06 - 01:55

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 Fri Dec 05, 2025 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
16266224412199,96sleep00-21swapper07:07:270
166029916414,107cyclictest22634-21munin-run08:25:010
166029916316,121cyclictest17403-21munin-run07:15:030
166029916313,125cyclictest19128-21modprobe07:40:010
166029916016,117cyclictest24240-21wc12:15:230
166029915719,99cyclictest3512-21apt-get10:10:360
166029915714,116cyclictest26115-21apt-get12:25:370
166029915615,97cyclictest19470-21df_inode11:45:290
166029915613,27cyclictest28324-21grep09:21:280
166029915613,24cyclictest19966-21latency_hist07:45:060
166029915519,23cyclictest8567-21munin-run10:40:020
166029915516,114cyclictest24881-21apt-get12:21:230
166029915514,118cyclictest27694-21munin-run09:20:070
166029915514,116cyclictest24983-21diskstats08:55:300
166029915418,111cyclictest17932-21munin-run07:20:020
166029915417,113cyclictest17055-21df_inode11:30:290
166029915416,23cyclictest31137-21munin-run09:40:020
166029915414,100cyclictest21667-21munin-run12:00:020
166029915318,111cyclictest8795-21diskstats10:40:300
166029915317,113cyclictest10387-21df_inode10:50:290
166029915316,23cyclictest13784-21df_inode11:10:390
166029915316,22cyclictest17856-21diskstats11:35:300
166029915313,23cyclictest28535-21munin-run12:40:020
166029915210,118cyclictest10111-21sed10:46:030
16602991519,119cyclictest12803-21/usr/sbin/munin11:05:290
166029915118,24cyclictest21882-21df12:00:230
166029915111,23cyclictest27035-21/usr/sbin/munin12:31:030
166029915017,26cyclictest23698-21munin-run08:40:020
166029915016,106cyclictest5716-21memory10:20:450
166029915015,108cyclictest24118-21ntpq08:40:490
166029915014,25cyclictest29538-21apt09:30:010
166029915011,117cyclictest30103-21mailstats09:30:590
166029915011,115cyclictest7484-21zcat10:30:560
16602991499,25cyclictest23643-21latency_hist08:35:050
166029914934,22cyclictest5078-21mailstats10:16:030
166029914931,19cyclictest23161-21sendmail_mailqu08:25:560
166029914915,111cyclictest20850-21awk07:55:520
166029914913,25cyclictest22006-21wc08:10:530
166029914912,115cyclictest11781-21munin-run11:00:040
166029914910,121cyclictest26028-1kworker/u3:409:10:100
166029914829,24cyclictest477-21expr09:50:220
166029914819,36cyclictest14523-21apt-get11:15:170
166029914814,30cyclictest22582-21apt-get12:05:160
166029914813,26cyclictest3572-21latency_hist10:10:070
166029914812,26cyclictest20263-1kworker/u3:507:45:480
16602991479,115cyclictest112-21systemd-journal07:30:010
16602991478,119cyclictest2320-21grep10:00:520
166029914725,103cyclictest18994-21wc11:40:540
166029914715,110cyclictest1302-21df_inode09:55:310
166029914714,29cyclictest25775-21apt-config09:05:070
166029914712,111cyclictest24769-21latency_hist08:55:010
166029914621,25cyclictest12141-21memory11:00:440
166029914618,26cyclictest6512-21memory10:25:460
166029914617,24cyclictest15526-21irqstats11:20:400
166029914616,27cyclictest25723-21apt-get09:05:450
166029914612,25cyclictest20790-21sed11:51:030
166029914611,50cyclictest299-21sshd07:23:190
16602991459,24cyclictest31366-21df_inode09:40:290
166029914520,26cyclictest32057-21apt-get09:45:210
166029914514,25cyclictest16146-21/usr/sbin/munin11:25:410
16602991448,22cyclictest24102-21wc12:15:030
166029914417,25cyclictest19007-21munin-run07:35:030
16602991428,25cyclictest21542-21munin-plugin-st08:10:010
166029914214,25cyclictest24645-21munin-run08:50:020
166029914213,28cyclictest22442-21cron08:17:000
166029913812,23cyclictest21458-21latency_hist08:05:040
166029913811,26cyclictest20447-21modprobe07:55:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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