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2026-04-08 - 22:00

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 50 highest latencies:
System rack5slot7s.osadl.org (updated Wed Apr 08, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
30118224352193,96sleep00-21swapper07:06:410
305359916313,125cyclictest15506-21cut12:06:590
305359916212,126cyclictest16603-21/usr/sbin/munin12:15:560
305359915916,119cyclictest13663-21memory08:40:440
305359915913,25cyclictest9627-21apt-get11:36:130
305359915730,20cyclictest0-21swapper10:30:450
305359915718,114cyclictest11908-21df_inode08:30:270
305359915713,28cyclictest22874-21unixbench_singl09:36:040
305359915713,100cyclictest4893-21apt-get07:46:590
305359915615,116cyclictest16506-21apt09:00:010
305359915614,117cyclictest26311-21grep09:57:040
305359915613,115cyclictest32596-21/usr/sbin/munin07:20:250
305359915612,101cyclictest18231-21/usr/sbin/munin12:25:110
305359915523,29cyclictest10787-21apt-get11:40:260
305359915516,22cyclictest8689-21df_inode08:10:290
305359915515,99cyclictest27979-21apt-get10:11:250
305359915514,24cyclictest14687-21munin-run12:05:040
305359915514,117cyclictest2977-21munin-run10:55:020
305359915421,103cyclictest6998-21apt-get08:00:210
305359915419,36cyclictest4593-21apt-get11:06:030
305359915419,109cyclictest15013-21apt-get08:50:120
305359915417,112cyclictest11111-21df08:25:280
305359915413,120cyclictest17413-21sort09:05:050
305359915320,29cyclictest21724-21munin-node07:15:040
305359915317,24cyclictest5725-21apt-get11:10:230
305359915317,20cyclictest2378-21sed07:31:070
305359915315,116cyclictest2184-21munin-run10:50:010
305359915315,113cyclictest5202-21apt-get07:50:350
305359915314,24cyclictest17540-21df12:20:250
305359915313,25cyclictest29405-21ntpq10:15:540
305359915313,103cyclictest16250-21mailstats12:11:020
305359915312,117cyclictest8161-21wc08:05:520
305359915311,119cyclictest19257-21sort12:30:410
305359915231,99cyclictest21059-21zcat09:25:550
305359915216,22cyclictest25342-21munin-run09:55:010
305359915212,118cyclictest10094-21munin-run08:20:010
305359915212,116cyclictest6628-21diskstats11:15:330
305359915210,119cyclictest19014-21/usr/sbin/munin09:15:280
30535991519,119cyclictest272-21snmpd10:56:050
305359915143,86cyclictest2932-21/usr/sbin/munin07:35:520
305359915117,24cyclictest12703-21df_inode08:35:280
305359915117,111cyclictest32551-21ls10:35:420
305359915116,23cyclictest20524-21munin-run12:40:030
305359915116,21cyclictest6176-21apt-get07:55:240
305359915114,112cyclictest27981-21munin-run10:10:020
30535991509,115cyclictest14581-21grep08:45:530
305359915017,25cyclictest18224-21apt-get09:10:180
305359915015,95cyclictest31430-21munin-run10:30:020
305359915015,22cyclictest21804-21grep09:30:530
305359915015,22cyclictest17532-21df_inode09:05:270
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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