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2026-05-08 - 17:07

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 highest latencies:
System rack5slot7s.osadl.org (updated Fri May 08, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2493224212188,87sleep00-21swapper07:07:230
28259916216,120cyclictest21847-21apt-get12:21:160
28259916016,102cyclictest12209-21munin-run11:20:020
28259915914,30cyclictest3639-21cut07:11:510
28259915821,113cyclictest11869-21apt-get08:00:230
28259915818,112cyclictest5080-21apt-get10:35:200
28259915721,115cyclictest24810-21sort12:35:420
28259915715,24cyclictest27333-21apt-get09:36:010
28259915527,21cyclictest0-21swapper08:55:040
28259915523,112cyclictest7397-21apt-get07:36:140
28259915518,23cyclictest24925-21apt09:20:020
28259915516,38cyclictest1527-21munin-run10:15:000
28259915515,23cyclictest21852-21munin-run12:20:020
2825991548,122cyclictest23321-21apt09:10:010
28259915439,23cyclictest6778-21/usr/sbin/munin07:30:230
28259915416,24cyclictest6566-21users07:26:060
28259915413,118cyclictest32134-21awk10:00:560
28259915411,119cyclictest8826-21grep10:56:000
28259915332,97cyclictest9980-21unixbench_singl07:46:020
28259915318,26cyclictest27297-21users09:31:060
28259915313,115cyclictest17004-21apt-get08:30:150
28259915220,106cyclictest12644-21ntp_states11:20:500
28259915219,27cyclictest16320-21diskstats08:25:330
28259915217,112cyclictest1525-21apt-get10:16:230
28259915213,117cyclictest401-21wc10:05:550
28259915119,108cyclictest14576-21users11:31:080
28259915119,107cyclictest22998-21apt-get12:25:260
28259915119,106cyclictest23791-21apt-get12:30:180
28259915118,28cyclictest5357-21memory07:20:430
28259915115,30cyclictest10580-21sshd11:06:590
28259915114,24cyclictest25047-21/usr/sbin/munin09:21:010
28259915111,23cyclictest4997-21munin-run07:20:030
28259915020,26cyclictest14582-21apt-get08:15:180
28259915018,21cyclictest10992-21apt-get07:55:270
28259915016,36cyclictest8850-21awk07:40:540
28259915016,113cyclictest4014-21wc10:25:570
28259915014,38cyclictest20985-21head12:11:010
28259915014,111cyclictest13487-21proc_pri11:25:530
28259915013,109cyclictest21010-21apt-get08:55:110
28259915012,115cyclictest10143-21apt-get07:50:160
28259915011,114cyclictest16771-21mailstats11:45:560
28259914917,23cyclictest8190-21munin-run10:55:020
28259914916,111cyclictest14482-21munin-run08:15:020
28259914915,110cyclictest18860-21diskstats12:00:340
28259914915,110cyclictest15417-21munin-run11:40:030
28259914836,22cyclictest28623-21if_err_eth009:40:440
28259914815,111cyclictest4395-21diskstats10:30:330
28259914813,23cyclictest10884-21/usr/sbin/munin11:10:410
28259914812,27cyclictest2331-1kworker/u3:610:20:120
28259914811,113cyclictest20069-21wc12:05:590
2825991479,32cyclictest11567-1kworker/u3:308:05:130
28259914726,96cyclictest18926-21ntpq08:40:490
28259914717,103cyclictest25845-21apt-get09:25:180
28259914713,94cyclictest15414-21apt-get08:20:150
28259914713,25cyclictest17126-21/usr/sbin/munin11:50:360
28259914713,111cyclictest9538-21fgrep11:00:560
28259914712,24cyclictest19660-21memory08:45:450
28259914712,111cyclictest22513-21sshd09:04:160
28259914712,110cyclictest29502-21latency09:45:410
28259914617,26cyclictest17926-21apt-get11:55:100
28259914614,93cyclictest31575-21munin-run10:00:030
28259914517,105cyclictest17904-21df_inode08:35:280
28259914515,22cyclictest6015-21diskstats10:40:310
28259914513,35cyclictest30073-21/usr/sbin/munin09:50:350
28259914414,26cyclictest23531-21df_inode09:10:280
28259914413,22cyclictest7301-21/usr/sbin/munin10:46:010
28259914412,111cyclictest16195-21users11:41:050
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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