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2025-08-21 - 21:35

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 Thu Aug 21, 2025 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21159224542197,91sleep00-21swapper07:07:440
214579916212,126cyclictest25179-21sed07:27:060
214579916035,100cyclictest26139-21/usr/sbin/munin07:35:140
214579916014,122cyclictest14727-21apt09:45:020
214579916014,120cyclictest4475-21munin-run12:00:020
214579915933,105cyclictest8734-21mailstats12:21:060
214579915714,101cyclictest11288-21apt-get09:26:260
214579915615,101cyclictest31440-21cat11:25:490
214579915614,25cyclictest11357-21munin-run12:40:030
214579915610,121cyclictest16040-21sed09:51:190
214579915515,114cyclictest29257-21munin-run07:55:010
214579915510,117cyclictest9345-21ntp_kernel_err12:25:490
21457991549,29cyclictest31602-21grep08:06:040
21457991549,121cyclictest26070-21wc07:35:030
214579915419,27cyclictest25554-21apt-get10:50:190
214579915418,51cyclictest27054-21munin-run11:00:010
214579915414,40cyclictest30873-21apt08:05:010
214579915414,117cyclictest624-21grep11:35:470
214579915410,120cyclictest21066-21wc10:20:560
214579915341,20cyclictest22399-21df10:30:290
214579915318,110cyclictest30274-21munin-run11:20:010
214579915316,39cyclictest6143-21apt-get12:07:000
214579915316,23cyclictest17358-21munin-run10:00:020
214579915315,40cyclictest10474-21munin-run09:20:030
214579915314,23cyclictest7404-21sed12:15:270
214579915313,37cyclictest5362-21apt-config12:05:080
214579915313,112cyclictest3502-21/usr/sbin/munin08:35:380
214579915312,116cyclictest2949-21zcat08:30:560
214579915312,100cyclictest2297-21grep08:26:050
214579915311,26cyclictest28450-21modprobe07:50:000
214579915223,37cyclictest0-21swapper09:45:460
214579915219,27cyclictest21554-21apt-get07:10:220
214579915216,26cyclictest32678-21diskstats08:15:340
214579915215,23cyclictest7106-21munin-run12:15:040
214579915214,24cyclictest8107-21cat09:05:040
214579915214,114cyclictest23522-21apt-get07:20:140
214579915213,23cyclictest27174-21apt-get11:00:200
214579915212,115cyclictest12667-21missed_timers09:30:520
214579915211,97cyclictest3437-21munin-run11:55:010
214579915120,104cyclictest22264-21munin-node07:15:100
214579915116,23cyclictest20581-21munin-run10:20:020
214579915116,113cyclictest11290-21munin-run09:25:030
214579915112,26cyclictest1796-21unixbench_singl11:41:040
214579915019,25cyclictest13914-21munin-run09:40:020
214579915016,22cyclictest29460-21munin-run11:15:010
214579915014,23cyclictest30391-21/usr/sbin/munin11:20:500
214579915013,113cyclictest19555-21cut10:10:590
214579915012,113cyclictest8726-21ls09:06:010
214579915010,25cyclictest18689-21grep10:05:560
214579915010,116cyclictest6268-21grep08:51:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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