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2025-11-25 - 20:07

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 Tue Nov 25, 2025 12:45:09)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
7402224292200,86sleep00-21swapper07:07:380
77129916117,101cyclictest17634-21apt-get11:30:260
77129916025,117cyclictest27111-21df09:10:280
77129916017,118cyclictest14042-21apt07:50:020
77129915880,53cyclictest29358-21sshd09:22:000
77129915842,24cyclictest20836-21unixbench_singl11:46:020
77129915810,122cyclictest1118-21apt-get09:51:580
77129915713,103cyclictest21022-21awk08:30:560
77129915637,98cyclictest15939-21latency_hist11:20:060
77129915616,116cyclictest14250-21df_inode07:50:280
7712991559,122cyclictest24869-21head12:11:040
7712991559,121cyclictest18870-21ls11:35:520
77129915575,57cyclictest24167-21grep08:50:540
77129915533,22cyclictest16341-21timerwakeupswit08:01:050
77129915516,115cyclictest8952-21memory07:15:350
77129915511,26cyclictest28450-21sshd12:35:280
77129915511,103cyclictest8506-21cat10:31:060
77129915437,22cyclictest1035-21grep09:46:030
77129915416,98cyclictest28148-21/usr/sbin/munin12:35:040
77129915416,24cyclictest6171-21munin-run10:20:020
77129915412,117cyclictest25300-21munin-run09:00:030
77129915319,28cyclictest18258-21df08:15:270
77129915314,99cyclictest23243-21memory08:45:440
77129915313,118cyclictest31542-21awk09:35:480
77129915311,27cyclictest19359-21ps08:20:550
77129915311,118cyclictest10657-21sort07:26:000
77129915215,113cyclictest30564-21df_inode09:30:290
7712991518,119cyclictest23096-21cut12:01:000
77129915114,39cyclictest20121-21apt11:45:020
77129915114,114cyclictest11627-21cut10:50:590
77129915113,115cyclictest2952-21munin-run10:00:030
77129915113,115cyclictest26883-21awk09:06:140
77129915112,114cyclictest9561-21latency07:20:480
77129915111,95cyclictest3941-21cstates10:05:250
77129915111,118cyclictest22599-21cat12:00:050
77129915031,22cyclictest0-21swapper08:35:560
77129915020,104cyclictest16780-21apt-get11:25:170
77129915019,104cyclictest17360-21apt-get08:10:170
77129915018,105cyclictest8841-21diskstats10:35:350
77129915015,22cyclictest25130-21df_inode12:15:280
77129915015,112cyclictest11039-21apt10:50:000
77129915012,114cyclictest30036-21grep09:26:010
77129915011,117cyclictest32494-21awk09:40:560
7712991499,25cyclictest16641-21wc08:05:240
77129914934,20cyclictest112-21systemd-journal09:01:520
77129914921,30cyclictest25972-21diskstats12:20:370
77129914921,102cyclictest7086-21apt-get10:25:190
77129914920,103cyclictest3072-21apt-get10:00:210
77129914916,113cyclictest14315-21cat11:10:050
77129914913,20cyclictest10197-21unixbench_singl10:41:030
77129914818,105cyclictest11033-21df_inode07:30:300
77129914817,105cyclictest11725-21apt-get07:35:180
77129914815,23cyclictest22468-21grep08:40:480
77129914815,110cyclictest6393-21df_inode10:20:280
77129914813,111cyclictest16157-21irqstats11:20:400
77129914811,97cyclictest14655-21tr11:10:480
77129914718,102cyclictest4661-21apt-get10:10:170
77129914713,23cyclictest24127-21apt12:10:000
77129914713,111cyclictest12391-21basename10:55:580
7712991469,23cyclictest27072-21grep12:25:570
77129914621,26cyclictest27808-21apt-get09:15:220
77129914618,25cyclictest15049-21df_inode07:55:290
77129914616,25cyclictest21259-21memory11:50:420
77129914615,27cyclictest12546-21/usr/sbin/munin07:40:240
77129914613,45cyclictest13439-21sshd11:02:310
77129914613,109cyclictest19902-21diskstats08:25:340
77129914612,109cyclictest8172-21wc07:10:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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