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2026-06-17 - 12:29

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot6s.osadl.org (updated Wed Jun 17, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2497121380,2sleep024968-21cat22:15:280
1573921350,3chrt15740-21/usr/sbin/munin19:35:160
239321300,3chrt2387-21munin-run20:50:000
933121230,4chrt9330-21sed23:20:270
90459912329,17cyclictest29949-21/usr/sbin/munin20:30:160
643421230,4chrt6435-21/usr/sbin/munin21:05:120
90459912026,16cyclictest9286-21/usr/sbin/munin19:10:170
90459911825,14cyclictest23278-21latency_hist20:05:010
90459911816,15cyclictest18862-21runrttasks21:52:300
1209321180,3chrt12089-21ps19:20:230
90459911731,13cyclictest27322-21/usr/sbin/munin20:20:140
90459911724,15cyclictest16543-21munin-node23:50:110
2743721170,4chrt27438-21timerwakeupswit00:30:300
9045991169,17cyclictest23281-21chrt00:15:220
90459911634,72cyclictest11654-21/usr/sbin/munin21:25:160
90459911629,15cyclictest17763-21runrttasks19:42:320
90459911629,14cyclictest22609-21runrttasks22:06:210
90459911628,16cyclictest13829-21sshd21:33:320
90459911616,14cyclictest11248-21runrttasks21:23:250
1811621160,4sleep018120-21ntp_states23:55:230
9045991159,17cyclictest28589-21chrt20:25:130
90459911529,75cyclictest15779-21/usr/sbin/munin21:40:240
90459911526,14cyclictest8635-21runrttasks23:19:510
90459911427,16cyclictest3502-21awk23:00:010
90459911427,16cyclictest14977-21runrttasks23:43:450
90459911423,16cyclictest23484-21if_eth020:05:170
9045991139,22cyclictest29330-21munin-run00:40:010
9045991138,25cyclictest27111-21modprobe20:20:000
9045991138,14cyclictest26376-21users22:20:300
90459911327,74cyclictest19555-21/usr/sbin/munin19:50:130
90459911324,14cyclictest18493-21/usr/sbin/munin19:45:250
9045991128,16cyclictest1168-21latency_hist20:45:020
90459911231,69cyclictest14658-21/usr/sbin/munin19:30:240
90459911210,18cyclictest24607-21ntp_states00:20:240
9045991118,22cyclictest21049-21sshd00:05:360
90459911125,15cyclictest11220-21runrttasks23:29:420
90459911125,12cyclictest15135-21runrttasks21:38:440
90459911124,15cyclictest21366-21runrttasks19:55:310
90459911117,17cyclictest12950-21ntpq23:35:190
90459911111,18cyclictest31341-21ntpq20:35:190
9045991108,16cyclictest17992-21date21:50:010
90459911027,16cyclictest4437-21runrttasks23:01:590
90459911026,13cyclictest19952-21runrttasks00:02:090
90459911023,12cyclictest12211-21runrttasks23:32:180
90459911021,14cyclictest27938-21runrttasks22:27:420
90459911010,18cyclictest10722-21ntp_states19:15:230
9045991099,27cyclictest2792-21ntp_states20:50:230
9045991099,24cyclictest19299-21/usr/sbin/munin21:55:140
90459910926,12cyclictest23177-21/usr/sbin/munin22:10:220
90459910923,14cyclictest13936-21runrttasks19:27:580
90459910922,14cyclictest1786-21runrttasks22:51:340
90459910921,14cyclictest32754-21timerandwakeup22:45:280
90459910911,20cyclictest28538-21memory22:30:190
90459910910,17cyclictest25802-21munin-run20:15:010
9045991089,16cyclictest5157-21df_inode21:00:120
9045991089,16cyclictest21182-21grep22:00:300
9045991088,15cyclictest8274-21/usr/sbin/munin21:10:280
90459910823,12cyclictest4748-21runrttasks20:58:250
90459910811,16cyclictest26186-21users00:25:300
90459910712,19cyclictest6497-21ntp_states23:10:220
90459910710,15cyclictest6093-21idleruntime-cro23:10:010
9045991067,28cyclictest217052chrt00:10:070
90459910626,14cyclictest9952-21runrttasks21:18:330
90459910620,14cyclictest297782chrt22:35:180
90459910611,17cyclictest31236-21ntp_states22:40:240
9045991049,15cyclictest15262-21/usr/sbin/munin23:45:260
9045991009,17cyclictest9052-21latency_hist19:10:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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