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2026-05-31 - 02:32

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 100 highest latencies:
System rack5slot7s.osadl.org (updated Sun May 31, 2026 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21018224592198,90sleep00-21swapper19:08:070
212779916110,125cyclictest22688-21apt-get19:20:240
212779915919,26cyclictest5111-21apt-get20:50:180
212779915917,117cyclictest15502-21awk21:50:470
212779915914,55cyclictest300-21sshd22:41:320
212779915816,117cyclictest25988-21munin-run19:40:030
212779915815,118cyclictest22603-21latency_hist19:20:080
212779915716,24cyclictest22060-21modprobe19:15:020
212779915619,22cyclictest7109-21apt-get00:20:250
212779915614,117cyclictest28604-21diskstats19:55:330
212779915614,117cyclictest11764-21/usr/sbin/munin21:30:110
212779915613,22cyclictest9066-21sort21:11:070
212779915612,119cyclictest4372-21cat20:45:230
212779915611,103cyclictest28897-21unixbench_singl23:11:030
212779915515,116cyclictest6971-21munin-run00:20:030
212779915514,26cyclictest18413-21/usr/sbin/munin22:10:560
212779915514,117cyclictest13416-21apt-get21:40:290
212779915512,25cyclictest9782-21mailstats21:15:590
212779915420,26cyclictest11085-21diskstats21:25:360
212779915415,115cyclictest24772-21/usr/sbin/munin19:30:470
212779915415,115cyclictest24746-21apt-get22:51:230
212779915415,113cyclictest23136-21munin-run22:40:020
212779915414,117cyclictest3365-21grep23:55:520
212779915412,119cyclictest27438-21sort23:05:040
212779915412,118cyclictest31796-21awk23:30:470
212779915343,90cyclictest21285-21mailstats22:25:560
212779915335,96cyclictest3777-21missed_timers20:40:450
212779915319,105cyclictest17620-21apt-get22:05:180
212779915315,115cyclictest6019-21diskstats20:55:320
212779915314,40cyclictest29791-21munin-run23:20:030
212779915314,26cyclictest17494-21awk22:01:080
212779915313,101cyclictest2950-21sh23:55:000
212779915312,117cyclictest7427-21apt-get21:05:550
212779915238,21cyclictest30234-21/usr/sbin/munin20:05:350
212779915215,25cyclictest5324-21users00:06:050
212779915215,24cyclictest7429-21munin-run21:05:050
212779915212,101cyclictest10872-21munin-run21:25:030
212779915211,26cyclictest28129-21sed23:06:020
212779915211,116cyclictest14709-21awk21:46:030
212779915135,22cyclictest27522-21grep19:46:020
212779915129,18cyclictest0-21swapper19:52:150
212779915128,107cyclictest6995-1kworker/u3:100:25:170
212779915120,106cyclictest32540-21memory23:35:460
212779915117,37cyclictest16706-21munin-run22:00:030
212779915115,26cyclictest3872-21/usr/sbin/munin00:00:360
212779915114,116cyclictest20042-21snmpd00:32:330
212779915112,99cyclictest19636-21find22:15:590
212779915112,25cyclictest31325-21head23:26:030
212779915016,97cyclictest32648-21munin-run20:20:030
212779915016,25cyclictest23799-21df19:25:330
212779915015,24cyclictest13264-21apt-get21:40:030
212779915014,109cyclictest1212-21df_inode20:25:300
212779915013,114cyclictest30938-21apt-get20:10:290
212779914937,21cyclictest24522-21mailstats22:45:590
212779914917,26cyclictest764-21df23:40:260
212779914916,26cyclictest5573-21diskstats00:10:320
212779914912,28cyclictest26386-21/usr/sbin/munin19:40:460
212779914814,111cyclictest980-21awk20:21:070
212779914811,25cyclictest10406-21sh00:40:010
212779914617,28cyclictest20154-21diskstats22:20:330
212779914615,46cyclictest2071-21irqstats20:30:360
212779914614,107cyclictest2155-21munin-run23:50:010
21277991459,113cyclictest3412-21basename20:40:030
212779914520,26cyclictest21746-21diskstats22:30:320
212779914519,102cyclictest30012-21munin-run20:05:020
212779914513,107cyclictest30011-21/usr/sbin/munin23:20:260
212779914313,28cyclictest26178-21ntpq22:55:570
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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