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2026-09-28 - 17:36

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 50 highest latencies:
System rack4slot6s.osadl.org (updated Mon Sep 28, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1951622530,2sleep019518-21latency_hist09:05:020
2081321230,3chrt20814-21latency_hist09:10:010
2658721220,2sleep026590-21sort09:30:260
3220721180,3chrt32205-21munin-run11:59:590
2240521180,2sleep022406-21ls07:10:150
222189911721,85cyclictest31416-21grep09:50:170
222189911712,90cyclictest9376-21/usr/sbin/munin08:25:140
22218991169,91cyclictest7809-21/usr/sbin/munin10:25:250
22218991149,91cyclictest2932-21ntpq10:05:220
2615021130,3chrt26149-21latency_hist07:25:020
222189911310,88cyclictest716-21sshd12:02:220
1611221130,3sleep016114-21fgrep08:50:240
22218991129,89cyclictest24851-21ntpq11:30:210
22218991119,89cyclictest642-21/usr/sbin/munin09:55:300
22218991119,87cyclictest7807-21memory12:30:180
22218991117,91cyclictest14222-21chrt08:44:210
22218991117,90cyclictest4020-21ntp_states12:15:210
22218991116,92cyclictest5114-21/usr/sbin/munin12:20:140
222189911132,69cyclictest16987-21irqstats11:00:160
222189911127,71cyclictest28740-21/usr/sbin/munin09:40:150
22218991109,87cyclictest24092-21users09:20:300
22218991108,88cyclictest3978-21latency_hist08:05:010
22218991108,87cyclictest32640-21/usr/sbin/munin07:50:180
22218991107,90cyclictest27244-21seq07:29:090
22218991106,89cyclictest20770-21/usr/sbin/munin11:15:140
22218991099,87cyclictest27679-21memory07:30:220
22218991099,87cyclictest14739-21sort10:50:260
22218991098,87cyclictest6415-21sshd08:14:210
22218991098,87cyclictest32571-21ls07:50:010
22218991098,87cyclictest23386-21/usr/sbin/munin11:25:140
22218991098,86cyclictest29999-21df_inode09:45:140
22218991097,90cyclictest8958-21df12:35:140
22218991097,88cyclictest4121-21df08:05:140
22218991097,88cyclictest26059-21memory11:35:180
22218991096,89cyclictest22310-21ntp_states11:20:210
222189910930,69cyclictest15790-21/usr/sbin/munin10:55:200
222189910912,82cyclictest22464-21sshd09:15:210
222189910910,87cyclictest29052-21ntp_states07:35:210
222189910910,72cyclictest28525-21df_inode11:45:130
22218991087,88cyclictest1873-21sendmail_mailst07:55:250
22218991086,90cyclictest15344-21chrt08:48:010
22218991086,89cyclictest8295-21ps08:20:250
22218991086,88cyclictest7622-21runrttasks10:24:340
22218991079,86cyclictest10431-21/usr/sbin/munin10:35:130
22218991079,84cyclictest10620-21df_inode08:30:130
22218991077,88cyclictest19748-21open_inodes11:10:250
22218991077,86cyclictest30811-21seq07:41:340
222189910711,79cyclictest9277-21memory10:30:180
22218991069,84cyclictest11840-21/usr/sbin/munin08:35:180
22218991068,86cyclictest29750-21grep11:50:100
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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