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2026-01-01 - 12:48

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 Thu Jan 01, 2026 00:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
24982224082180,90sleep00-21swapper19:06:020
254869916720,122cyclictest24678-21apt-get22:27:010
254869916316,122cyclictest32110-21memory19:51:150
254869916018,25cyclictest31571-21munin-run19:50:020
254869916015,118cyclictest5618-21apt-get23:45:150
254869915811,122cyclictest20645-21sh22:00:010
254869915714,23cyclictest4686-21cron23:40:010
254869915711,125cyclictest5412-21diskstats20:25:340
254869915617,116cyclictest31529-21df_inode23:05:350
254869915615,117cyclictest9993-21apt-get20:56:580
254869915614,100cyclictest2973-21/usr/sbin/munin23:30:490
254869915518,23cyclictest29010-21apt-get22:50:130
254869915517,111cyclictest23987-21apt-get22:20:190
25486991549,26cyclictest27845-21wc22:40:560
254869915413,25cyclictest8060-21head23:57:050
254869915324,109cyclictest1169-21unixbench_singl23:16:040
254869915318,36cyclictest28908-21apt22:50:010
254869915318,107cyclictest29262-21apt-get19:35:220
254869915316,23cyclictest26278-21munin-run19:15:020
254869915316,113cyclictest2549-21apt-get20:11:020
254869915313,21cyclictest4825-21apt-get23:40:190
254869915311,25cyclictest9117-21apt-get00:11:520
254869915239,91cyclictest14518-21if_eth021:20:380
254869915222,28cyclictest8614-21ntp_states00:00:530
254869915220,29cyclictest7824-21diskstats20:40:350
254869915218,29cyclictest17676-21diskstats21:40:330
254869915214,24cyclictest9119-21munin-run00:10:040
254869915213,97cyclictest2565-21gpgv20:10:060
254869915117,47cyclictest9410-21diskstats20:50:310
254869915116,36cyclictest25907-21df22:30:350
254869915114,24cyclictest6648-21memory23:50:440
254869915113,113cyclictest32650-21awk23:11:120
254869915113,113cyclictest10358-21diskstats00:15:410
254869915112,22cyclictest15950-21apt-get21:30:190
25486991509,118cyclictest27345-21mailstats19:21:000
254869915031,20cyclictest7592-21munin-run20:40:010
254869915028,20cyclictest11801-21latency_hist00:25:030
254869915022,102cyclictest2182-21apt-get23:25:190
254869915017,25cyclictest26758-21munin-run19:20:020
254869915015,25cyclictest22260-21munin-run22:10:020
254869915015,21cyclictest30777-21apt19:45:010
254869915014,22cyclictest3778-21df20:15:330
254869915011,114cyclictest8618-21diskstats20:45:340
254869914918,23cyclictest12837-21df21:10:270
254869914917,113cyclictest1598-21grep20:01:010
254869914917,106cyclictest13460-21apt-get00:35:170
254869914913,95cyclictest19105-21sort21:50:040
254869914913,24cyclictest27303-21systemctl22:40:010
254869914910,24cyclictest12401-21sort00:26:010
254869914828,22cyclictest5222-21cat20:25:040
254869914820,26cyclictest19256-21df21:50:250
254869914817,24cyclictest28466-21apt-get19:30:190
254869914815,47cyclictest30506-21munin-run23:00:020
254869914815,25cyclictest11467-21ntp_states21:01:000
254869914813,28cyclictest12368-21find21:05:580
254869914812,113cyclictest463-21grep19:55:510
25486991479,24cyclictest21391-21grep22:01:030
254869914717,28cyclictest6413-21ntp_states20:30:520
254869914716,26cyclictest22943-21/usr/sbin/munin22:11:030
254869914713,111cyclictest27859-21uname19:25:420
254869914712,23cyclictest16854-21diskstats21:35:320
254869914614,108cyclictest15850-21munin-run21:30:010
254869914611,25cyclictest1912-21wc23:21:000
254869914610,27cyclictest14244-21munin-run21:20:020
254869914512,48cyclictest12664-21/usr/sbin/munin00:30:210
254869914432,91cyclictest31308-21cron23:05:000
254869914220,97cyclictest23264-21diskstats22:15:320
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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