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2025-10-28 - 05:04

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 Oct 28, 2025 00:45:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
13673224272200,85sleep00-21swapper19:09:490
137399916120,24cyclictest17849-21wc19:31:250
137399916114,25cyclictest4298-21irqstats21:25:380
137399915843,94cyclictest23271-21apt-config20:05:100
137399915811,104cyclictest3427-21df21:20:250
137399915810,124cyclictest750-21apt-get21:05:170
137399915717,99cyclictest18347-21df22:50:250
137399915639,23cyclictest21000-21open_inodes23:05:530
137399915616,23cyclictest6419-21apt21:40:010
137399915612,117cyclictest245-21cron23:16:000
137399915519,109cyclictest20839-21apt-get19:50:220
137399915512,117cyclictest31893-21ls00:11:030
137399915423,110cyclictest0-21swapper23:30:470
137399915413,28cyclictest19613-21wc19:40:550
137399915317,113cyclictest10044-21snmpd21:42:430
137399915316,112cyclictest28416-21diskstats20:35:360
137399915314,38cyclictest13935-21df19:10:250
137399915314,115cyclictest24296-21awk23:25:550
137399915312,22cyclictest11252-21/usr/sbin/munin22:10:050
13739991528,119cyclictest16032-21grep22:35:410
137399915231,16cyclictest0-21swapper21:58:260
137399915218,23cyclictest29393-21munin-run00:00:030
137399915217,111cyclictest29388-21apt-get00:01:200
137399915214,99cyclictest19748-21munin-run23:00:010
137399915214,23cyclictest30030-21df_inode20:45:290
137399915212,26cyclictest3058-21timerandwakeup21:16:020
137399915212,116cyclictest26525-21grep23:40:410
137399915212,115cyclictest17167-21sort19:26:040
137399915210,120cyclictest1898-21sort00:26:050
13739991519,118cyclictest25795-21munin-run20:20:030
137399915124,20cyclictest0-21swapper20:15:000
137399915118,23cyclictest11250-21apt-get22:11:320
137399915116,111cyclictest574-21apt21:05:010
137399915113,112cyclictest18552-21/usr/sbin/munin19:35:440
137399915110,118cyclictest31108-21ls00:06:070
137399915110,118cyclictest1-21systemd23:35:260
13739991509,26cyclictest20341-21ntpq19:45:500
137399915020,27cyclictest1703-21apt-get21:10:300
137399915015,40cyclictest10452-21apt22:05:000
137399915015,36cyclictest32555-21zcat00:15:580
137399915013,27cyclictest26568-21/usr/sbin/munin20:21:050
137399915011,116cyclictest31355-21sed20:51:040
137399914915,24cyclictest5028-21df_inode21:30:310
137399914911,113cyclictest22752-21grep20:00:500
137399914911,112cyclictest16080-21cat19:20:480
13739991489,115cyclictest2199-21ls00:30:250
137399914815,112cyclictest3615-21munin-run00:40:010
137399914813,114cyclictest13085-21apt-get22:21:340
137399914813,113cyclictest27994-21df23:50:250
137399914812,108cyclictest29125-21/usr/sbin/munin20:40:430
137399914811,24cyclictest17117-21awk22:40:590
137399914811,114cyclictest22062-21fgrep19:55:570
137399914811,112cyclictest12947-21/usr/sbin/munin22:16:110
137399914718,103cyclictest27508-21apt-get20:30:160
137399914716,103cyclictest14237-21apt-get22:25:160
137399914628,17cyclictest0-21swapper23:21:000
137399914619,27cyclictest15214-21memory19:16:020
137399914615,27cyclictest511-21/usr/sbin/munin00:20:420
137399914614,25cyclictest31685-21irqstats20:55:390
137399914613,111cyclictest15028-21/usr/sbin/munin22:30:420
13739991458,26cyclictest8602-21mailstats21:51:010
137399914512,47cyclictest7643-21ntpq21:45:510
137399914512,23cyclictest17816-21grep22:45:570
137399914510,27cyclictest22019-21grep23:11:020
137399914411,108cyclictest20170-21/usr/sbin/munin23:00:510
137399914315,106cyclictest27794-21munin-run23:50:020
137399914119,100cyclictest26885-21irqstats20:25:390
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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