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2026-05-01 - 03:23

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 50 highest latencies:
System rack5slot7s.osadl.org (updated Fri May 01, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32592224252190,89sleep00-21swapper19:09:240
327039916242,100cyclictest17915-21/usr/sbin/munin00:15:120
327039916218,120cyclictest16372-21irqstats00:00:460
327039916016,119cyclictest6303-21apt-get19:42:040
327039915818,24cyclictest7995-21users19:51:040
327039915816,118cyclictest20314-21munin-run21:10:020
327039915815,120cyclictest6125-21apt-get23:00:280
327039915814,26cyclictest18469-21apt-get21:00:440
327039915812,122cyclictest21051-21awk21:11:390
327039915716,116cyclictest28568-21munin-run22:00:020
327039915712,27cyclictest13692-21wc20:30:040
327039915616,22cyclictest28689-21apt-get22:00:170
327039915615,25cyclictest10548-21apt-get20:10:120
327039915613,117cyclictest5378-21cron19:40:000
327039915612,27cyclictest22337-21sendmail-mta21:20:230
327039915513,19cyclictest3534-21apt-get22:45:290
327039915513,117cyclictest9426-21munin-run23:20:010
327039915512,24cyclictest4851-21wc22:51:000
327039915418,22cyclictest16077-21munin-run00:00:020
327039915417,112cyclictest31244-21irqstats22:15:380
327039915413,29cyclictest30812-21sshd22:11:020
327039915312,25cyclictest24958-21ntp_kernel_pll_21:35:460
327039915311,119cyclictest18593-21ls21:00:110
327039915217,26cyclictest16182-21apt-get20:45:170
327039915217,21cyclictest15042-21/usr/sbin/munin23:55:050
327039915214,19cyclictest13558-21dpkg23:45:130
327039915212,102cyclictest8557-21find19:55:550
327039915130,18cyclictest0-21swapper23:36:030
327039915117,93cyclictest14461-21apt20:35:020
327039915116,24cyclictest765-21find19:10:560
327039915114,24cyclictest10240-21munin-run23:25:030
327039915113,115cyclictest13462-21wc23:45:020
327039915112,27cyclictest11067-21latency_hist23:30:050
327039915111,114cyclictest21890-21mailstats21:16:080
327039915018,102cyclictest32707-21apt-get22:25:180
327039915017,107cyclictest27073-21apt-get21:50:170
327039915014,30cyclictest26275-21/usr/sbin/munin21:45:510
327039915012,114cyclictest1331-21awk22:30:480
327039915011,115cyclictest10347-21sshd20:06:020
32703991498,119cyclictest11578-21/usr/sbin/munin20:15:420
327039914936,91cyclictest5570-21ntp_kernel_pll_22:55:480
327039914917,37cyclictest3799-21munin-run19:30:020
327039914917,106cyclictest11139-21apt-get23:30:170
327039914916,25cyclictest14667-21df_inode20:35:260
327039914916,110cyclictest2188-21munin-run19:20:040
327039914915,112cyclictest21832-21munin-run00:40:060
327039914915,109cyclictest2541-21munin-run22:40:030
327039914915,107cyclictest17119-21apt-get00:10:140
327039914913,113cyclictest2951-21/usr/sbin/munin22:40:470
327039914912,24cyclictest20656-21ntp_states00:30:520
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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