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2026-05-20 - 18:02

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 all highest latencies:
System rack5slot7s.osadl.org (updated Wed May 20, 2026 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
21744224402181,99sleep00-21swapper07:08:130
219869915920,114cyclictest29330-21apt-get11:10:420
219869915716,24cyclictest22777-21munin-run07:15:030
219869915712,121cyclictest32254-21apt-key08:10:280
219869915616,99cyclictest21232-21apt10:20:130
219869915614,25cyclictest31950-21munin-run08:10:050
219869915611,119cyclictest14646-21systemctl09:40:010
219869915539,21cyclictest3740-21apt-get08:36:260
219869915535,98cyclictest6138-21mailstats08:45:580
219869915517,38cyclictest10071-21irqstats09:11:100
219869915517,24cyclictest3628-21apt-get11:50:110
219869915515,116cyclictest8880-21zcat12:20:530
219869915418,113cyclictest29015-21irqstats07:50:380
219869915416,115cyclictest3154-21df_inode08:30:290
219869915415,117cyclictest6747-21sort12:10:020
219869915415,112cyclictest22886-21munin-node09:55:110
219869915413,39cyclictest27134-21munin-run07:40:040
219869915324,106cyclictest0-21swapper11:00:060
219869915321,105cyclictest31292-21apt-get11:20:180
219869915313,25cyclictest20259-21munin-run10:15:000
219869915312,40cyclictest3027-21cat08:30:050
219869915312,25cyclictest5117-21latency_hist12:00:000
219869915221,104cyclictest23327-21diskstats07:15:490
219869915219,103cyclictest22334-21diskstats10:25:400
219869915218,26cyclictest7283-21apt-get08:55:180
219869915213,96cyclictest24221-21irqstats07:20:380
219869915138,19cyclictest21116-21cut10:20:070
219869915114,48cyclictest31105-21/usr/sbin/munin11:16:090
219869915111,60cyclictest15782-21cat09:45:400
219869915110,27cyclictest6788-21ntp_kernel_pll_08:50:500
219869915036,22cyclictest1754-21ntp_kernel_pll_08:20:470
219869915015,114cyclictest28082-21memory11:00:450
219869915014,113cyclictest18550-21cat10:00:590
219869915012,25cyclictest16981-21head09:51:030
219869915012,113cyclictest5492-21grep12:00:460
219869915011,114cyclictest26319-21cron07:35:010
219869914917,27cyclictest24745-21diskstats10:40:320
219869914917,23cyclictest24951-21df_inode07:25:300
219869914913,98cyclictest11549-21munin-run12:40:030
219869914913,26cyclictest417-21/usr/sbin/munin11:30:460
219869914913,113cyclictest2777-21wc11:45:030
219869914913,111cyclictest24096-21grep10:35:440
219869914912,21cyclictest30343-21munin-run08:00:020
219869914911,98cyclictest30703-21memory08:00:420
219869914910,23cyclictest20042-21snmpd09:20:110
219869914818,106cyclictest10162-21diskstats12:30:320
219869914815,23cyclictest13842-21apt09:35:020
219869914814,112cyclictest8178-21sort12:15:590
219869914811,27cyclictest27603-21/usr/sbin/munin07:40:520
219869914810,116cyclictest32682-1kworker/u3:608:15:200
21986991478,115cyclictest11377-21users09:16:120
219869914719,27cyclictest19425-21users10:06:060
219869914716,23cyclictest23019-21apt-get10:30:180
219869914715,22cyclictest6834-21apt12:10:120
219869914714,111cyclictest2828-21/usr/sbin/munin11:45:450
219869914711,28cyclictest4897-21/usr/sbin/munin08:41:110
219869914710,113cyclictest29268-21sed11:06:070
219869914618,103cyclictest8216-21diskstats09:00:350
219869914614,96cyclictest12457-21df_inode09:25:260
219869914614,27cyclictest32677-21sort11:26:010
219869914614,108cyclictest1911-21apt11:40:010
219869914613,110cyclictest9366-21df_inode12:25:290
219869914611,108cyclictest26225-21apt-get10:50:190
219869914524,20cyclictest0-21swapper09:43:110
219869914512,40cyclictest9534-21grep09:06:030
219869914412,46cyclictest28395-21/usr/sbin/munin07:45:520
219869914311,41cyclictest25539-21diskstats10:45:300
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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