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2025-12-21 - 16:36

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 Dec 21, 2025 12:45:07)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
9121224062178,84sleep00-21swapper07:08:520
92939916113,125cyclictest25270-21sort08:46:010
92939916036,27cyclictest26597-21ntpq12:10:480
92939916030,34cyclictest0-21swapper10:57:000
9293991589,67cyclictest10961-21apt-key07:20:140
92939915720,28cyclictest15927-21apt-get07:50:220
92939915719,23cyclictest18790-21/usr/sbin/munin11:20:590
92939915718,115cyclictest6681-21apt-get10:10:170
92939915717,118cyclictest27860-21/usr/sbin/munin09:05:060
92939915639,23cyclictest10520-21mailstats10:31:040
92939915621,106cyclictest23964-21apt-get08:40:220
92939915620,27cyclictest20681-21apt-get11:35:220
92939915518,27cyclictest22343-21apt-get08:30:180
92939915514,99cyclictest10500-21irqstats07:15:350
92939915412,118cyclictest13932-21/usr/sbin/munin10:55:040
92939915411,25cyclictest32498-21tr09:30:500
92939915340,22cyclictest22573-21/usr/sbin/munin11:45:450
92939915329,105cyclictest7610-21apt-get10:15:240
92939915316,114cyclictest18176-21munin-run11:20:030
92939915315,98cyclictest27858-21apt-get09:06:320
92939915314,116cyclictest28580-21users12:21:050
92939915313,117cyclictest4455-21cut09:56:070
92939915312,121cyclictest18849-21sort08:06:010
92939915312,114cyclictest20744-21latency_hist08:20:070
92939915311,118cyclictest5154-21wc10:00:550
92939915311,116cyclictest5479-21apt-get10:06:380
92939915219,23cyclictest3014-21apt-get09:50:280
92939915218,25cyclictest25552-21apt-get08:50:190
92939915216,98cyclictest2845-21munin-run09:50:040
92939915215,25cyclictest15261-21/usr/sbin/munin07:45:380
92939915215,116cyclictest28715-21apt12:25:120
92939915213,27cyclictest27670-21wc12:16:020
92939915213,117cyclictest10824-21apt-get10:35:160
92939915211,40cyclictest16522-21grep11:06:050
92939915210,100cyclictest23946-21wc08:40:060
92939915112,21cyclictest24142-21sort11:55:470
92939915112,114cyclictest20355-21awk11:30:590
92939915111,118cyclictest18234-21latency_hist08:05:020
92939915038,91cyclictest31589-21kernelversion09:25:410
92939915030,21cyclictest0-21swapper08:10:240
92939915018,23cyclictest30487-21apt09:20:020
92939915017,106cyclictest30611-21apt-get09:20:170
92939915013,111cyclictest25499-21/usr/sbin/munin12:05:360
92939915011,38cyclictest14653-21kworker/u2:911:00:200
92939915010,29cyclictest1996-21head09:41:030
9293991498,26cyclictest14164-21sed07:36:050
92939914928,21cyclictest0-21swapper07:40:450
92939914916,104cyclictest12723-21apt-get07:30:200
92939914913,112cyclictest21960-21awk08:25:530
92939914912,27cyclictest9312-21/usr/sbin/munin10:25:250
92939914833,92cyclictest12193-21grep07:25:550
92939914814,22cyclictest13131-21apt10:50:010
92939914811,112cyclictest29507-21/usr/sbin/munin12:30:500
92939914810,95cyclictest19829-21grep11:30:040
92939914771,37cyclictest26610-21wc08:55:450
92939914718,100cyclictest30417-21diskstats12:35:350
92939914715,28cyclictest23087-21/usr/sbin/munin11:50:380
92939914713,46cyclictest11654-21/usr/sbin/munin10:40:230
92939914712,113cyclictest10098-21munin-node07:15:080
92939914711,112cyclictest17294-21grep11:11:010
92939914612,96cyclictest24820-21diskstats12:00:350
92939914611,112cyclictest289-21snmpd11:40:470
92939914610,51cyclictest17419-21apt08:00:010
92939914513,108cyclictest28987-21apt-get09:10:140
92939914512,93cyclictest21007-21missed_timers08:20:470
92939914414,24cyclictest648-21diskstats09:35:320
92939914115,21cyclictest8437-21apt-get10:20:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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