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2026-09-15 - 15:00

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 Tue Sep 15, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2455621910,3sleep024554-21grep07:50:190
1886521660,2sleep018868-21cpu11:40:120
2907821350,3chrt29074-21latency_hist12:20:010
2211721280,3chrt22116-21/usr/sbin/munin09:45:260
13933991258,103cyclictest22152-21sshd11:51:380
2318821220,3sleep023189-21switchtime11:55:260
139339912120,88cyclictest7789-21users10:55:300
13933991207,99cyclictest25627-21irqstats10:00:170
139339911810,92cyclictest19344-21proc_pri09:35:260
13933991168,95cyclictest27994-21runrttasks10:10:010
139339911632,73cyclictest19780-21runrttasks07:30:270
13933991159,91cyclictest8511-21/usr/sbin/munin11:00:250
139339911410,91cyclictest5791-21latency_hist10:50:010
13933991139,90cyclictest5107-21ntp_states08:40:220
13933991137,92cyclictest30806-21/usr/sbin/munin08:15:170
13933991128,90cyclictest24172-21/usr/sbin/munin09:55:290
13933991128,88cyclictest13973-21date07:10:010
13933991119,90cyclictest27345-21awk08:00:250
13933991119,88cyclictest29800-21sshd12:20:370
13933991118,89cyclictest32532-21/usr/sbin/munin10:25:290
13933991117,90cyclictest23961-21runrttasks09:54:250
139339911110,88cyclictest31938-21memory12:30:210
13933991108,90cyclictest4613-21sshd08:39:370
13933991108,89cyclictest25457-21/usr/sbin/munin12:05:170
13933991108,88cyclictest16505-21/usr/sbin/munin11:30:210
13933991107,89cyclictest17890-21/usr/sbin/munin11:35:250
13933991107,89cyclictest1363-21/usr/sbin/munin10:30:290
13933991106,91cyclictest3966-21seq10:40:330
13933991099,87cyclictest1547-21sshd12:38:380
13933991098,86cyclictest32335-21/usr/sbin/munin08:20:210
13933991096,89cyclictest20321-21/usr/sbin/munin09:40:130
139339910933,65cyclictest28754-21/usr/sbin/munin08:05:290
139339910910,85cyclictest15928-21chrt11:28:250
13933991089,85cyclictest23069-21/usr/sbin/munin07:45:130
13933991088,89cyclictest20185-21df11:45:130
13933991088,87cyclictest16330-21chrt07:18:490
13933991088,85cyclictest29522-21memory10:15:170
13933991087,88cyclictest31060-21fgrep10:20:260
13933991087,87cyclictest27176-21users12:10:330
139339910810,86cyclictest28342-21ntp_states10:10:220
13933991078,87cyclictest276-21runrttasks08:30:170
13933991078,87cyclictest13796-21latency_hist09:15:010
13933991078,86cyclictest30648-21memory12:25:180
13933991078,86cyclictest11137-21runrttasks11:10:130
13933991078,85cyclictest8722-21df08:55:130
13933991078,84cyclictest276-21runrttasks07:25:050
13933991077,87cyclictest23002-21latency_hist07:45:010
13933991077,87cyclictest13746-21df_inode11:20:130
13933991077,86cyclictest3264-21cat10:40:010
13933991077,86cyclictest1090-21irqstats08:25:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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