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2026-04-21 - 21:56

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 100 highest latencies:
System rack5slot7s.osadl.org (updated Tue Apr 21, 2026 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
28602224332181,89sleep00-21swapper07:09:570
286529916515,104cyclictest5600-21/usr/sbin/munin11:25:380
286529916130,19cyclictest0-21swapper07:16:140
286529915838,23cyclictest9447-21latency_hist08:30:050
286529915812,122cyclictest6242-21wc08:10:050
286529915717,24cyclictest24567-21/usr/sbin/munin10:00:370
286529915712,21cyclictest11897-21apt-get08:45:170
286529915625,94cyclictest22375-21grep09:46:020
286529915611,104cyclictest23513-21grep09:55:040
286529915516,114cyclictest1469-21munin-run11:00:030
286529915515,115cyclictest1464-21apt-get07:40:150
286529915514,25cyclictest8530-21grep11:40:530
286529915512,118cyclictest31930-21tr10:45:480
286529915427,18cyclictest0-21swapper09:05:410
286529915415,24cyclictest20848-21munin-run09:40:030
286529915414,115cyclictest19348-21apt-get09:30:160
286529915412,25cyclictest16464-21/usr/sbin/munin09:11:410
28652991538,124cyclictest32612-21uname10:50:410
286529915312,116cyclictest27152-21grep10:15:530
286529915311,118cyclictest21661-21sh09:45:010
286529915219,30cyclictest641-21apt-get07:35:170
286529915214,114cyclictest14420-21cat12:16:010
286529915212,24cyclictest7768-21munin-run08:20:030
286529915212,115cyclictest13486-21/usr/sbin/munin08:55:480
286529915139,91cyclictest3760-21timerwakeupswit11:11:030
286529915116,112cyclictest29457-21munin-node07:15:060
286529915115,28cyclictest2255-21/usr/sbin/munin07:46:010
286529915115,22cyclictest29213-21apt-get10:30:200
286529915115,112cyclictest17640-21munin-run09:20:020
286529915113,115cyclictest8047-21if_eth008:20:360
286529915111,116cyclictest16947-21sed12:31:040
286529915031,20cyclictest0-21swapper07:50:120
286529915015,113cyclictest25200-21apt-get10:05:150
286529915015,111cyclictest12112-21users12:01:050
286529915011,36cyclictest7476-21expr11:35:370
286529915011,24cyclictest5099-21find08:00:560
286529915011,24cyclictest11797-21munin-run08:45:010
286529915010,97cyclictest27910-21/usr/sbin/munin10:20:480
28652991499,29cyclictest9328-21/usr/sbin/munin11:45:480
28652991499,116cyclictest19248-21munin-run09:30:010
28652991498,116cyclictest15103-21find12:20:560
286529914921,100cyclictest15520-21apt-get12:25:220
286529914914,112cyclictest11011-21latency_hist08:40:040
286529914912,116cyclictest9905-21find08:30:570
286529914911,24cyclictest272-21snmpd11:06:000
28652991488,117cyclictest12996-21wc12:10:040
286529914832,22cyclictest31455-21sed10:41:060
286529914818,103cyclictest17760-21apt-get09:20:170
286529914817,24cyclictest30251-21memory10:35:450
286529914815,24cyclictest11330-21apt12:00:010
286529914814,112cyclictest4913-21/usr/sbin/munin11:20:270
286529914813,115cyclictest14310-21apt-get09:00:160
286529914813,112cyclictest26663-21sshd10:11:150
286529914812,98cyclictest12784-21systemd-journal12:40:000
286529914739,88cyclictest28580-21interrupts10:25:370
286529914718,24cyclictest23692-21df_inode09:55:370
286529914715,108cyclictest10492-21users11:51:070
286529914714,110cyclictest6868-21/usr/sbin/munin08:11:020
286529914713,23cyclictest7091-21munin-run11:35:000
286529914712,26cyclictest306-21mailstats07:30:570
286529914711,27cyclictest4211-21proc_pri07:55:550
286529914615,36cyclictest2269-21sshd11:03:160
286529914615,27cyclictest13234-21/usr/sbin/munin08:51:000
286529914517,26cyclictest30955-21memory07:20:430
286529914513,21cyclictest13743-21latency_hist12:15:050
286529914511,24cyclictest32041-21switchtime07:26:000
28652991438,114cyclictest4599-21grep11:16:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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