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2026-06-23 - 15:23

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Tue Jun 23, 2026 12:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
374923030,2sleep03748-21wc08:10:280
2036122550,3sleep020358-21ps09:15:250
1200622490,2sleep012009-21latency_hist10:50:010
1981622450,2sleep019812-21latency_hist11:20:030
2185022140,2sleep021851-21timerandwakeup09:20:260
1068121370,3sleep010683-21sh10:44:590
2773921310,4sleep027740-21wc11:50:160
19848212616,24sleep0288-21snmpd07:08:230
1641121250,2sleep016413-21awk11:05:240
209521230,3sleep02093-21cat12:15:260
294021190,4chrt2941-21latency_hist10:15:010
200979911810,92cyclictest24183-21ntp_states09:30:220
200979911725,83cyclictest5364-21latency_hist12:30:020
20097991168,92cyclictest30625-21ntp_states09:55:210
2421121130,4chrt24212-21grep11:35:260
200979911311,89cyclictest8395-21grep08:30:100
20097991128,90cyclictest17431-21/usr/sbin/munin09:05:220
200979911210,88cyclictest29157-21ntp_states11:55:220
20097991118,90cyclictest10579-21chrt08:37:570
20097991115,92cyclictest29646-21/usr/sbin/munin07:45:260
200979911110,87cyclictest5102-21users08:15:300
20097991108,89cyclictest25103-21/usr/sbin/munin11:40:140
20097991108,88cyclictest26563-21/usr/sbin/munin09:40:140
200979911010,87cyclictest26256-21chrt07:32:530
200979911010,87cyclictest21666-21memory07:15:180
20097991098,87cyclictest24154-21/usr/sbin/munin07:25:140
20097991098,86cyclictest30464-21ntp_states12:00:220
20097991097,88cyclictest30704-21/usr/sbin/munin07:50:170
200979910926,71cyclictest25439-21/usr/sbin/munin09:35:200
20097991089,87cyclictest423-21grep10:05:020
20097991089,86cyclictest31747-21/usr/sbin/munin12:05:220
20097991087,88cyclictest14829-21/usr/sbin/munin08:55:100
20097991086,89cyclictest717-21/usr/sbin/munin08:00:130
20097991086,89cyclictest17528-21ntpq11:10:220
200979910813,82cyclictest216-21rs:main0
20097991079,87cyclictest6240-21users10:25:300
20097991078,86cyclictest114-21systemd-journal11:45:010
20097991077,87cyclictest27841-21/usr/sbin/munin09:45:140
20097991077,86cyclictest21335-21/usr/sbin/munin11:25:180
20097991069,85cyclictest20257-21df_inode07:10:140
20097991068,86cyclictest22618-21/usr/sbin/munin09:25:180
20097991068,83cyclictest6276-21mailstats08:20:260
20097991068,82cyclictest9406-21sendmail-msp10:40:010
20097991067,86cyclictest2557-21chrt08:05:340
200979910627,69cyclictest1-21systemd09:15:010
200979910613,82cyclictest17369-21cat09:05:020
200979910613,82cyclictest13499-21grep08:50:010
20097991059,83cyclictest14799-21latency_hist08:55:020
20097991058,86cyclictest1616-21chrt10:09:530
20097991058,85cyclictest5603-21latency_hist10:25:020
20097991058,84cyclictest5644-21memory12:30:170
20097991057,87cyclictest6812-21/usr/sbin/munin12:35:140
20097991057,84cyclictest22515-21chrt11:30:140
20097991049,84cyclictest348-21df_inode12:10:140
20097991048,85cyclictest3194-21ntpq12:20:250
20097991047,85cyclictest26830-21memory07:35:180
20097991038,82cyclictest22849-21df07:20:120
20097991037,83cyclictest3354-21awk10:15:260
20097991037,83cyclictest29239-21/usr/sbin/munin09:50:180
20097991037,82cyclictest13372-21/usr/sbin/munin10:55:310
20097991036,84cyclictest15941-21latency_hist11:05:020
200979910326,66cyclictest29098-21runrttasks07:44:570
200979910311,78cyclictest32423-21chrt07:55:370
20097991025,86cyclictest20377-21timerandwakeup11:20:260
200979910225,65cyclictest7209-21/usr/sbin/munin08:25:150
20097991018,83cyclictest12153-21df_inode10:50:130
20097991006,83cyclictest11270-21ntp_states08:40:220
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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