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2026-01-01 - 21:29

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 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
14391223822153,174sleep00-21swapper07:08:470
145719916745,22cyclictest24134-21/usr/sbin/munin08:10:400
145719915915,122cyclictest28901-21munin-run08:40:040
145719915815,25cyclictest24824-21apt-get08:15:270
145719915716,117cyclictest29040-21apt-get08:40:250
145719915714,120cyclictest13888-21cat10:25:470
145719915619,106cyclictest31026-21diskstats12:10:340
145719915617,25cyclictest2567-21df12:35:250
145719915615,115cyclictest21322-21sort07:51:010
145719915611,121cyclictest970-21uname09:05:390
145719915538,96cyclictest15812-21timerwakeupswit10:36:010
14571991549,119cyclictest32199-21cut12:15:570
145719915415,25cyclictest17210-21irqstats10:46:090
145719915414,24cyclictest3084-21apt09:20:020
145719915410,120cyclictest28971-21sendmail_mailtr11:56:580
145719915332,35cyclictest19658-21kernelversion11:00:420
145719915314,25cyclictest20613-21pluginstate11:05:520
145719915313,117cyclictest28098-21latency_hist08:35:010
145719915311,116cyclictest7916-21sort09:50:030
145719915310,117cyclictest18200-21grep07:31:070
145719915218,24cyclictest19306-21users10:56:050
145719915211,28cyclictest2107-21ls09:10:590
145719915136,92cyclictest26880-21kernelversion11:45:400
145719915130,21cyclictest5878-21awk09:35:470
145719915116,112cyclictest16079-21diskstats07:20:330
145719915116,111cyclictest25893-21apt-get11:40:200
145719915111,115cyclictest109-21systemd-journal09:25:010
14571991509,116cyclictest27563-21wc11:50:250
145719915035,21cyclictest25771-21munin-run11:40:020
145719915021,29cyclictest21554-21apt-get07:55:180
145719915020,27cyclictest24514-21memory11:30:450
145719915019,25cyclictest17862-21apt-get10:50:290
145719915016,25cyclictest1677-21apt-get12:30:170
145719915016,112cyclictest289-21snmpd07:10:580
145719915012,25cyclictest12796-21cat10:20:050
145719915012,116cyclictest289-21snmpd08:45:190
145719915011,41cyclictest14910-21cut10:30:590
145719915011,24cyclictest4373-21wc09:25:530
145719914928,33cyclictest0-21swapper07:15:290
145719914915,25cyclictest30122-21/usr/sbin/munin12:05:480
145719914915,110cyclictest9498-21munin-run10:00:010
145719914915,110cyclictest30960-21/usr/sbin/munin08:50:360
145719914911,117cyclictest289-21snmpd09:52:100
145719914817,21cyclictest4907-21df_inode09:30:300
145719914816,28cyclictest21173-21diskstats11:10:340
145719914815,37cyclictest10316-21munin-run10:05:010
145719914812,39cyclictest16526-21cut10:40:580
145719914810,23cyclictest19536-21wc07:40:520
145719914773,50cyclictest27186-21cat08:26:020
145719914737,89cyclictest6878-21sendmail_mailtr09:40:570
145719914718,27cyclictest10834-21/usr/sbin/munin10:05:540
145719914718,26cyclictest23482-21apt-get11:25:190
145719914715,110cyclictest289-21snmpd10:14:090
145719914715,109cyclictest31733-21df_inode08:55:280
145719914713,93cyclictest26439-21sed08:21:080
145719914710,26cyclictest22552-21modprobe11:20:010
145719914633,18cyclictest0-21swapper09:00:240
145719914629,20cyclictest0-21swapper08:01:050
145719914614,108cyclictest22790-21df_inode11:20:270
145719914612,26cyclictest23892-21ls08:10:040
14571991459,115cyclictest289-21snmpd12:25:560
145719914530,18cyclictest18447-21df07:35:250
145719914516,39cyclictest29569-21memory12:00:520
145719914514,46cyclictest16864-21df07:25:250
145719914512,110cyclictest13137-21ntpq10:20:520
145719914411,106cyclictest32540-21/usr/sbin/munin12:20:510
145719914311,25cyclictest20506-21cat07:46:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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