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2025-11-26 - 03:06

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 Wed Nov 26, 2025 00:44:02)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2648121700,3sleep026480-21proc_pri22:55:240
1105421390,2sleep011052-21timerandwakeup00:00:300
3061421320,3chrt30615-21sendmail_mailtr21:05:260
31697212719,82sleep031737-21memory19:05:180
327559911632,71cyclictest3591-21/usr/sbin/munin19:20:300
32755991157,15cyclictest27810-21ntp_states20:55:210
327559911531,73cyclictest4605-21/usr/sbin/munin21:30:300
327559911432,72cyclictest13633-21/usr/sbin/munin22:05:280
32755991138,90cyclictest5942-21/usr/sbin/munin23:40:290
32755991138,14cyclictest9596-21/usr/sbin/munin21:50:210
32755991137,90cyclictest13575-21seq20:00:210
32755991137,15cyclictest24026-21grep20:40:260
327559911328,73cyclictest1751-21/usr/sbin/munin21:20:170
32755991128,90cyclictest12069-21df_inode19:55:140
32755991127,93cyclictest32747-21/usr/sbin/munin23:20:160
32755991127,12cyclictest26066-21seq20:49:400
32755991126,14cyclictest30096-21seq23:10:120
327559911232,71cyclictest6784-21/usr/sbin/munin21:40:120
327559911230,71cyclictest20190-21/usr/sbin/munin20:25:260
327559911211,87cyclictest3346-21users23:30:280
327559911210,88cyclictest22657-21ntp_states20:35:250
32755991119,90cyclictest8704-21chrt21:45:440
32755991117,89cyclictest19559-21/usr/sbin/munin00:35:210
32755991117,16cyclictest17387-21ntp_kernel_err22:20:200
32755991117,13cyclictest4202-21sed23:35:170
32755991108,89cyclictest31374-21df23:15:130
32755991108,88cyclictest16957-21seq20:14:130
32755991108,88cyclictest12621-21chrt00:07:120
32755991108,87cyclictest4381-21/usr/sbin/munin19:25:170
32755991108,87cyclictest14187-21chrt00:14:330
32755991108,13cyclictest23866-21ntp_states22:45:200
32755991107,88cyclictest3722-21runrttasks21:27:160
32755991107,15cyclictest26804-21sort20:50:280
32755991107,13cyclictest20880-21sort22:35:010
32755991107,12cyclictest15804-21/usr/sbin/munin22:15:250
32755991107,11cyclictest143722sleep000:15:090
327559911031,70cyclictest32098-21sshd21:10:410
32755991098,86cyclictest6977-21if_eth019:35:170
32755991098,13cyclictest2858-21munin-run19:20:010
32755991098,13cyclictest22290-21grep20:35:020
32755991098,13cyclictest1616-21irqstats23:25:170
32755991097,85cyclictest29024-21/usr/sbin/munin21:00:160
32755991097,12cyclictest10916-21ntp_states21:55:200
32755991089,86cyclictest6355-21sshd21:37:480
32755991087,86cyclictest18233-21seq20:19:060
32755991087,13cyclictest28950-21runrttasks23:05:210
32755991087,12cyclictest191162chrt00:32:280
32755991086,15cyclictest17044-21df00:25:130
32755991086,12cyclictest19006-21users22:25:290
32755991085,13cyclictest14675-21df_inode20:05:140
32755991079,85cyclictest7106-21cut23:45:280
32755991078,87cyclictest11072-21ps19:50:250
32755991077,86cyclictest9143-21runrttasks19:43:380
32755991077,86cyclictest28692-21latency_hist23:05:010
32755991077,13cyclictest15843-21irqstats00:20:160
32755991076,11cyclictest5825-21/usr/sbin/munin19:30:220
32755991068,14cyclictest18564-21df_inode20:20:140
32755991067,86cyclictest7981-21df_inode23:50:130
32755991067,12cyclictest12089-21irqstats22:00:160
32755991066,87cyclictest21574-21users22:35:280
32755991059,84cyclictest15434-21runrttasks22:13:000
32755991059,82cyclictest9507-21runrttasks19:45:130
32755991058,85cyclictest1479-21munin-run21:20:010
32755991057,86cyclictest9260-21df_inode23:55:120
32755991056,13cyclictest1588-21latency_hist19:15:010
32755991055,13cyclictest22406-21if_err_eth022:40:170
327559910529,66cyclictest26078-21latency_hist22:55:020
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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