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2026-07-17 - 16:44

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 792 highest latencies:
System rack5slot7s.osadl.org (updated Fri Jul 17, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
19866224322201,86sleep00-21swapper07:09:160
199929916819,26cyclictest7108-21ntp_states12:26:310
199929916715,127cyclictest20784-21/usr/sbin/munin07:15:060
199929916042,23cyclictest2065-21/usr/sbin/munin11:55:500
199929916035,22cyclictest29746-21apt-get08:11:480
199929915917,117cyclictest21081-21munin-node07:15:230
199929915915,117cyclictest3372-21apt-get12:05:190
199929915911,110cyclictest32017-21ntp_states08:20:520
199929915818,98cyclictest2326-21apt08:40:010
199929915813,118cyclictest711-21grep11:46:000
199929915718,112cyclictest5796-21apt-get12:20:160
199929915715,119cyclictest14474-21apt09:55:140
199929915712,122cyclictest27862-21/usr/sbin/munin07:56:580
199929915710,103cyclictest26404-21munin-node07:50:120
199929915638,97cyclictest5346-21switchtime08:56:020
199929915617,26cyclictest5657-21/usr/sbin/munin09:00:270
199929915614,22cyclictest16963-21apt-get10:10:310
199929915517,27cyclictest4165-21/usr/sbin/munin12:11:110
199929915514,116cyclictest4150-21df_inode08:50:320
199929915513,25cyclictest25052-21munin-run11:00:010
199929915416,116cyclictest1068-21diskstats11:50:310
199929915415,115cyclictest2690-21memory08:40:450
199929915411,117cyclictest22666-21cat07:25:470
199929915338,22cyclictest25719-21ls11:01:030
199929915325,92cyclictest0-21swapper10:50:020
199929915316,113cyclictest19442-21apt10:25:000
199929915315,115cyclictest3354-21diskstats08:45:310
199929915313,116cyclictest19974-21wc10:25:590
199929915312,102cyclictest28484-21sort08:00:510
199929915238,22cyclictest24557-21timerandwakeup07:36:050
199929915221,103cyclictest13681-21apt-get09:50:210
199929915216,109cyclictest23199-21apt-get07:30:200
199929915213,24cyclictest5072-21diskstats12:15:310
199929915213,23cyclictest10656-21uname09:30:410
199929915212,26cyclictest20341-21/usr/sbin/munin10:30:360
199929915210,117cyclictest29706-21/usr/sbin/munin11:26:330
199929915117,108cyclictest832-21apt-get08:30:190
199929915116,38cyclictest21251-21diskstats10:35:320
199929915116,25cyclictest26867-21df_inode11:10:310
199929915115,114cyclictest7895-21head09:11:070
199929915114,26cyclictest18624-21latency_hist10:20:020
199929915023,22cyclictest21612-21apt-get07:20:140
199929915019,30cyclictest30864-21users11:31:150
199929915016,37cyclictest29084-21munin-run11:25:000
199929915016,24cyclictest8411-21apt-get12:35:160
199929915014,37cyclictest349-21ntpq08:25:510
199929915014,27cyclictest27553-21/usr/sbin/munin11:15:450
199929915014,113cyclictest8991-21diskstats09:20:310
199929914920,25cyclictest31175-21irqstats11:35:370
199929914919,24cyclictest8023-21/usr/sbin/munin12:31:010
199929914918,28cyclictest29165-21diskstats08:05:390
199929914916,24cyclictest8155-21df_inode09:15:320
199929914913,96cyclictest6563-21df_inode09:05:310
199929914911,38cyclictest2575-21/usr/sbin/munin12:01:080
199929914910,26cyclictest24247-21sh10:55:020
199929914818,27cyclictest15539-21memory10:00:440
199929914816,107cyclictest24814-21/usr/sbin/munin07:40:540
199929914815,108cyclictest26207-21memory11:05:460
199929914813,112cyclictest22073-21diskstats10:40:300
19992991478,119cyclictest13578-21latency_hist09:50:010
199929914719,26cyclictest30871-21apt-get08:15:300
199929914716,106cyclictest16793-21munin-run10:10:010
199929914713,21cyclictest11372-21df_inode09:35:310
199929914712,25cyclictest26391-21latency_hist07:50:060
199929914615,23cyclictest9780-21df_inode09:25:280
199929914477,48cyclictest12518-21find09:40:580
199929914412,23cyclictest32194-21grep11:40:560
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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