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2026-09-15 - 00:15

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 Mon Sep 14, 2026 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
3905224442203,98sleep00-21swapper07:10:000
39519916017,26cyclictest31518-21apt-get09:56:270
39519915916,118cyclictest19001-21apt-get11:57:020
39519915915,25cyclictest20491-21irqstats08:46:090
39519915911,28cyclictest19159-21/usr/sbin/munin08:36:070
39519915843,94cyclictest9802-21timerwakeupswit07:41:020
39519915815,118cyclictest8331-21apt-get10:51:110
39519915717,115cyclictest11945-21df07:55:350
39519915713,119cyclictest15649-21wc08:15:540
39519915615,119cyclictest8134-21sort07:31:000
39519915614,28cyclictest12541-21apt-get08:01:280
39519915614,117cyclictest8429-21cat10:50:090
39519915611,120cyclictest1841-21sshd10:06:100
39519915541,23cyclictest1187-21latency_hist10:05:050
39519915523,28cyclictest21162-21apt-get12:05:260
39519915516,37cyclictest20033-21apt-get12:01:380
39519915516,21cyclictest10886-21apt-get07:50:230
39519915516,115cyclictest6724-21munin-run10:40:020
39519915515,115cyclictest5297-21diskstats07:15:520
39519915418,109cyclictest29237-21apt-get09:40:160
39519915416,114cyclictest17624-21diskstats11:45:330
39519915415,98cyclictest5341-21diskstats10:30:310
3951991539,123cyclictest16882-21snmpd08:31:030
39519915336,22cyclictest4399-21sort10:25:050
39519915317,29cyclictest11190-21diskstats11:05:330
39519915316,39cyclictest24475-21df12:25:260
39519915316,25cyclictest23686-21df_inode12:20:290
39519915315,113cyclictest22867-21df09:00:280
39519915312,27cyclictest14730-21sshd08:10:430
39519915312,118cyclictest22528-21wc12:10:590
39519915311,29cyclictest30506-21tr09:45:580
3951991529,121cyclictest9541-21wc10:55:290
39519915217,113cyclictest17153-21memory08:25:450
39519915214,116cyclictest19429-21df_inode08:40:280
39519915211,43cyclictest17002-21tr11:40:470
39519915210,22cyclictest26677-21munin-run09:25:010
39519915210,119cyclictest12138-21grep11:10:450
3951991519,117cyclictest5064-21head10:26:020
39519915118,24cyclictest26068-21df_inode12:35:280
39519915116,94cyclictest28311-21apt09:35:010
39519915115,115cyclictest25794-21sed12:31:020
39519915114,113cyclictest19003-21munin-run11:55:020
39519915112,115cyclictest24353-21/usr/sbin/munin09:11:080
39519915111,114cyclictest28935-21cat09:36:000
39519915039,92cyclictest16449-21timerandwakeup11:36:030
39519915014,24cyclictest3216-21grep10:15:540
39519915013,108cyclictest16115-21/usr/sbin/munin08:20:350
39519915012,28cyclictest7503-21munin-plugin-st07:30:020
39519915012,114cyclictest15461-21proc_pri11:30:530
39519914918,26cyclictest10718-21munin-run07:50:020
39519914916,23cyclictest8824-21grep07:35:570
39519914916,106cyclictest6843-21/usr/sbin/munin10:40:200
39519914911,113cyclictest21578-21sendmail_mailqu08:51:020
39519914910,100cyclictest13806-21diskstats08:05:400
3951991488,102cyclictest14119-21grep11:21:020
39519914830,96cyclictest22803-21/usr/sbin/munin12:15:230
39519914819,25cyclictest10287-21apt-get11:00:180
39519914812,95cyclictest4124-21cstates07:10:230
39519914810,112cyclictest6609-21grep07:21:020
3951991479,104cyclictest22769-1kworker/u3:109:05:130
39519914716,24cyclictest14306-21apt-get11:25:130
39519914713,25cyclictest22226-21awk08:55:450
39519914713,22cyclictest25152-21apt-get09:15:170
39519914713,111cyclictest13106-21wc11:15:570
39519914712,24cyclictest26907-21/usr/sbin/munin09:25:350
39519914615,28cyclictest31335-21wc09:50:580
39519914615,23cyclictest2176-21irqstats10:10:370
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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