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2025-11-16 - 13:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 highest latencies:
System rack5slot7s.osadl.org (updated Sun Nov 16, 2025 00:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
32703224342176,97sleep00-21swapper19:09:420
3159916516,26cyclictest1831-21munin-run19:20:030
3159916212,126cyclictest9395-21apt-get20:05:190
3159915915,24cyclictest24360-21tr21:35:470
3159915912,121cyclictest19749-21latency_hist21:10:030
3159915817,118cyclictest10254-21munin-run23:30:010
3159915811,122cyclictest18862-21/usr/sbin/munin00:20:470
315991579,107cyclictest6184-21wc23:05:220
3159915715,117cyclictest12612-21awk23:40:550
3159915618,23cyclictest16623-21apt-get20:50:190
3159915617,112cyclictest4233-21apt-get19:35:360
3159915610,117cyclictest15849-21awk00:00:570
3159915522,28cyclictest12724-21diskstats20:25:350
3159915516,46cyclictest13963-21irqstats23:50:380
3159915513,119cyclictest6971-21apt-get23:10:310
3159915431,24cyclictest15670-21sed20:41:050
3159915416,24cyclictest21251-21apt-get00:35:180
3159915416,116cyclictest32375-21memory22:25:460
3159915415,96cyclictest1978-21munin-run22:40:020
3159915412,26cyclictest1130-21munin-node19:15:050
3159915335,24cyclictest7946-21irqstats19:55:420
3159915330,24cyclictest14042-21sed20:31:100
3159915316,39cyclictest10252-21apt-get23:31:590
3159915315,23cyclictest20530-21apt-get21:15:480
3159915312,101cyclictest11697-21munin-run20:20:020
3159915311,28cyclictest6801-21grep19:46:120
3159915272,38cyclictest27580-21/usr/sbin/munin21:55:500
3159915227,34cyclictest0-21swapper19:41:050
3159915216,29cyclictest26354-21users21:46:080
3159915216,110cyclictest8599-21apt-get20:00:200
3159915215,113cyclictest31524-21uname22:20:430
3159915212,29cyclictest22848-21ps21:25:530
3159915212,28cyclictest31185-21kworker/u2:322:17:000
3159915211,23cyclictest6976-21/usr/sbin/munin19:50:130
3159915114,113cyclictest20363-21sort21:10:580
3159915113,26cyclictest23971-21modprobe21:35:010
3159915111,27cyclictest17136-21sshd00:10:180
3159915110,25cyclictest15075-21mailstats23:55:590
315991509,26cyclictest8739-21cat23:20:050
3159915018,109cyclictest12080-21munin-run23:40:020
3159915013,38cyclictest31863-21snmpd23:25:000
3159915011,23cyclictest17580-21/usr/sbin/munin20:55:420
3159915010,39cyclictest13245-21wc23:45:460
315991499,26cyclictest3453-21sort19:30:030
3159914932,18cyclictest0-21swapper22:55:410
3159914915,22cyclictest22389-21munin-run21:25:030
3159914914,27cyclictest24899-21/usr/sbin/munin21:40:520
3159914913,37cyclictest18872-21head21:01:040
3159914913,113cyclictest2794-21latency_hist22:45:010
3159914912,25cyclictest18652-21unixbench_singl00:16:140
3159914828,98cyclictest0-21swapper20:39:480
3159914814,110cyclictest16901-21munin-run00:10:020
3159914812,113cyclictest29976-21sort22:10:470
3159914811,115cyclictest31863-21snmpd20:50:010
3159914810,24cyclictest12080-21wc20:20:480
3159914717,29cyclictest10299-21diskstats20:10:350
3159914712,97cyclictest2644-21munin-plugin-st19:25:020
3159914712,93cyclictest21136-21cron00:35:000
3159914712,110cyclictest19942-21/usr/sbin/munin00:25:490
315991469,114cyclictest26606-21diskstats21:50:350
3159914619,28cyclictest3638-21df19:30:280
3159914611,96cyclictest5942-21sed23:01:030
3159914523,22cyclictest716-21memory22:30:460
3159914511,22cyclictest28843-21sort22:05:030
3159914511,110cyclictest29172-21cat22:05:460
3159914415,24cyclictest2895-21apt-get22:45:180
3159914312,94cyclictest4386-21munin-run22:55:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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