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2026-05-14 - 05:21

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #2, 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.
Unexpectedly long latencies may be caused by SMIs
Total number of samples: 100 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 50 highest latencies:
System rack2slot7s.osadl.org (updated Thu May 14, 2026 00:43:05)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1955155995547,5cyclictest2015255-21awk21:40:011
195515699543,37cyclictest2060896-21ssh22:35:582
1955156995130,16cyclictest421-21dbus-daemon22:20:532
1955156995041,5cyclictest2117344-21mailstats23:46:002
1955154994943,3cyclictest0-21swapper/020:35:010
1955154994942,4cyclictest2003217-21grep21:25:010
1955154994926,14cyclictest1472737-21kworker/u8:1+events_unbound20:50:520
1955156994537,5cyclictest1054-21mta-sts-daemon23:53:252
195515699453,34cyclictest2093027-21ssh23:15:572
1955156994434,5cyclictest0-21swapper/223:20:522
1955156994433,8cyclictest421-21dbus-daemon21:30:452
195515699443,34cyclictest2157192-21sendmail-mta00:35:502
1955155994436,5cyclictest2020192-21fschecks_time21:45:451
1955155994436,5cyclictest0-21swapper/100:00:011
1955155994435,6cyclictest96104-21cups-browsed21:30:561
1955155994435,5cyclictest2135925-21munin-plugin-st00:10:011
1955155994434,7cyclictest421-21dbus-daemon22:10:011
1955155994434,6cyclictest421-21dbus-daemon23:40:001
1955155994430,9cyclictest2028634-21rm21:55:531
1955156994335,5cyclictest2019322-21systemd-run21:45:022
1955156994332,7cyclictest0-21swapper/222:45:012
1955156994331,9cyclictest1-21systemd00:30:012
1955156994331,9cyclictest1-21systemd00:30:012
1955155994334,6cyclictest1968654-21systemd-run19:55:011
1955156994234,5cyclictest1961169-21systemd-run19:30:012
1955156994232,6cyclictest1-21systemd22:55:012
1955156994232,6cyclictest1-21systemd22:55:012
1955155994234,4cyclictest0-21swapper/100:20:021
1955154994233,5cyclictest2024870-21sendmail_mailqu21:51:020
1955154994229,3cyclictest0-21swapper/023:31:030
1955154994221,15cyclictest12450irq/33-eth000:15:560
1955155994133,4cyclictest2051784-21kworker/u8:1-xprtiod22:35:011
1955155994131,6cyclictest2115899-21latency_hist23:45:021
1955154994134,4cyclictest2071513-21systemd-run22:50:020
1955156994032,5cyclictest2127901-21ssh00:00:012
1955156994032,5cyclictest2056212-21aten_r2power_vo22:30:442
1955156994032,5cyclictest1955159-21systemd-run19:10:012
1955156994031,5cyclictest2079524-21cron23:00:002
1955155994032,5cyclictest2100570-21fschecks_count23:25:471
1955155994032,5cyclictest1960175-21fschecks_count19:25:451
1955155994032,4cyclictest0-21swapper/122:55:571
1955155994031,5cyclictest0-21swapper/123:51:031
1955154994033,4cyclictest1-21systemd22:05:010
1955154994030,8cyclictest1979161-21true20:30:010
1955154994030,8cyclictest1979161-21true20:30:010
1955156993931,5cyclictest1-21systemd21:00:022
1955156993930,5cyclictest261-21systemd-journal22:30:002
1955156993928,8cyclictest2045072-21switchtime22:16:022
1955156993928,6cyclictest0-21swapper/223:25:542
195515699391,31cyclictest2153241-21ssh00:30:572
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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