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2026-06-17 - 19:48

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 all highest latencies:
System rack5slot7s.osadl.org (updated Wed Jun 17, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
25763224362194,97sleep00-21swapper07:08:230
259889916215,119cyclictest30335-21apt-get07:36:580
259889916210,123cyclictest24684-21/usr/sbin/munin10:11:060
259889916113,124cyclictest16444-21wc09:20:560
259889916018,118cyclictest26778-21/usr/sbin/munin07:15:040
259889915913,104cyclictest7410-21apt-get08:31:310
259889915911,124cyclictest9241-21systemctl08:40:020
259889915741,22cyclictest29715-21cstates07:30:230
259889915723,31cyclictest10246-21apt-get08:45:350
259889915717,117cyclictest32393-21munin-run11:00:010
259889915616,24cyclictest22309-21apt10:00:010
259889915615,121cyclictest7416-21http08:30:050
259889915513,29cyclictest29228-21grep10:40:540
259889915416,111cyclictest27248-21apt-get10:30:190
259889915412,117cyclictest9538-21grep08:40:420
259889915411,100cyclictest19106-21munin-run09:40:020
259889915410,121cyclictest5747-21apt-get08:20:250
259889915329,102cyclictest0-21swapper11:45:430
259889915316,113cyclictest5569-21munin-run08:20:050
259889915315,37cyclictest15896-21munin-run09:20:020
259889915313,22cyclictest3727-21apt-get08:11:370
259889915312,23cyclictest3733-21cut11:20:560
259889915310,25cyclictest32004-21ls07:41:050
259889915239,21cyclictest27221-21latency_hist10:30:050
259889915221,31cyclictest621-21apt-get07:50:200
259889915220,24cyclictest32513-21apt-get11:00:260
259889915219,105cyclictest6480-21apt-get11:40:200
259889915216,25cyclictest5656-21apt-get11:35:190
259889915216,24cyclictest12675-21munin-run09:00:010
259889915215,25cyclictest31185-21/usr/sbin/munin10:52:000
259889915215,23cyclictest15085-21munin-run09:15:010
259889915215,111cyclictest15293-21/usr/sbin/munin12:35:550
259889915213,117cyclictest4319-21sort11:25:440
259889915211,42cyclictest2801-21sort08:01:000
25988991519,118cyclictest3352-21ntp_states08:05:540
259889915122,101cyclictest20020-21apt-get09:45:210
259889915121,102cyclictest9686-21apt-get12:00:210
259889915116,112cyclictest9566-21munin-run12:00:010
259889915115,24cyclictest12785-21sendmail12:20:010
259889915114,25cyclictest20926-21df_inode09:50:310
259889915113,23cyclictest12911-21diskstats09:00:350
259889915112,113cyclictest23058-21sed10:01:020
259889915111,117cyclictest17607-21apt-get09:30:160
259889915111,113cyclictest2086-21sshd07:56:180
25988991509,23cyclictest14281-21modprobe09:10:000
259889915017,29cyclictest32395-21diskstats07:45:320
259889915012,23cyclictest11385-21df_inode12:10:270
259889915011,22cyclictest11875-21munin-run08:55:010
259889914914,46cyclictest5032-21irqstats11:30:370
259889914818,104cyclictest1642-21apt-get11:10:180
259889914817,25cyclictest3087-21/usr/sbin/munin11:16:030
259889914816,110cyclictest28744-21munin-run10:40:030
259889914816,110cyclictest25753-21df10:20:240
259889914814,111cyclictest12784-21systemd-journal12:20:180
259889914814,110cyclictest8632-21ls11:51:010
259889914721,26cyclictest26953-21df07:15:150
259889914713,112cyclictest24822-21apt-get10:15:160
25988991469,116cyclictest1474-21sed11:06:020
259889914626,22cyclictest0-21swapper09:40:200
259889914613,27cyclictest28048-21/usr/sbin/munin07:20:470
259889914612,26cyclictest29657-21/usr/sbin/munin10:45:450
259889914611,96cyclictest17507-21munin-run09:30:020
259889914611,22cyclictest10667-21uname12:05:400
259889914610,26cyclictest14726-21sort12:30:380
259889914514,25cyclictest23232-21apt-get10:05:130
259889914420,27cyclictest28847-21apt-get07:25:220
259889914417,25cyclictest14399-21apt12:30:010
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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