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2026-08-18 - 15:59

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #3

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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 rack5slot3s.osadl.org (updated Tue Aug 18, 2026 12:44:29)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
173832236161,26sleep00-21swapper/007:08:380
172772222193,19sleep20-21swapper/207:07:162
173282204168,24sleep10-21swapper/107:07:541
173942203166,24sleep30-21swapper/307:08:463
1758799106103,2cyclictest0-21swapper/210:58:222
306002570,3sleep330603-21unixbench-2d11:15:263
140832550,1sleep00-21swapper/008:10:260
58032540,2sleep00-21swapper/011:35:130
95352530,2sleep10-21swapper/109:15:201
132192520,5sleep313222-21cpuspeed_turbos09:25:143
254972380,8sleep081ktimersoftd/012:20:120
17587993611,12cyclictest17855-21df_inode09:35:152
17587993610,8cyclictest11214-21smart_sda11:45:242
17576993611,12cyclictest9730-21munin-run11:45:010
17587993510,16cyclictest26078-21munin-run09:55:012
1757699357,13cyclictest15713-21awk10:45:020
17587993410,9cyclictest87550irq/128-enp1s0-11:50:122
1757699346,13cyclictest4724-21awk10:20:010
17587993319,5cyclictest17598-21/usr/sbin/munin12:00:202
17587993311,10cyclictest6298-21perf09:10:012
17587993310,9cyclictest11256-21df_inode09:20:142
1757699336,12cyclictest20722-21idleruntime-cro12:10:010
1757699331,24cyclictest22571-21kworker/0:312:15:480
1758799329,14cyclictest23155-21/usr/sbin/munin12:15:212
1758799328,14cyclictest30071-21missed_timers11:15:202
1758799327,16cyclictest425-21sed10:10:012
1758799324,18cyclictest579-21systemd-journal08:15:012
1758799319,14cyclictest26661-21wc12:20:242
1758799317,16cyclictest1150-21users12:35:282
1758799317,10cyclictest2111-21/usr/sbin/munin09:00:202
17587993111,11cyclictest19105-21sed07:10:232
17587993110,7cyclictest9932-21grep10:30:172
1758799310,14cyclictest0-21swapper/210:40:422
1757699311,18cyclictest13763-21kworker/0:011:51:080
1758799309,5cyclictest808-21snmpd08:00:412
1758799309,12cyclictest20383-21hddtemp_smartct09:40:162
1758799307,6cyclictest2513-21latency_hist10:15:012
1758799307,6cyclictest2513-21latency_hist10:15:012
1758799306,16cyclictest7629-21latency_hist11:40:022
17587993011,7cyclictest18874-21awk08:25:022
17587993011,10cyclictest766-21ntpd07:46:142
1758199303,15cyclictest31982-40dnf08:54:251
1757699302,13cyclictest6300-21munin-run09:10:000
1758799299,6cyclictest25170-21cpuspeed_turbos07:25:132
1758799298,9cyclictest0-21swapper/211:25:572
1758799295,13cyclictest0-21swapper/209:33:442
1758799294,14cyclictest12438-21cat10:35:192
17587992919,6cyclictest5547-40dnf07:53:412
17587992919,6cyclictest5547-40dnf07:53:412
17587992912,5cyclictest16309-21sshd08:15:412
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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