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2026-08-09 - 06:44

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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: 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 rack4slot1s.osadl.org (updated Sun Aug 09, 2026 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
264802920,4sleep30-21swapper/320:13:583
247522920,2sleep30-21swapper/320:09:003
310772790,1chrt0-21swapper/023:19:000
310772790,1chrt0-21swapper/023:19:000
266802660,2chrt0-21swapper/323:08:493
244072660,3sleep024408-21fschecks_time20:08:570
27032640,3sleep30-21swapper/320:38:443
191442630,4sleep30-21swapper/319:54:013
3792995946,10cyclictest1346-21avahi-daemon00:03:470
3792995946,10cyclictest1346-21avahi-daemon00:03:470
3792995946,10cyclictest1346-21avahi-daemon00:03:470
38502540,2chrt0-21swapper/323:33:583
288092540,3sleep30-21swapper/323:13:563
288092540,3sleep30-21swapper/323:13:563
61252490,3sleep00-21swapper/022:13:510
229052420,3sleep00-21swapper/020:04:030
379299402,29cyclictest15090-21df_inode00:03:570
192852400,4sleep20-21swapper/222:48:552
273382390,2sleep30-21swapper/321:43:553
3792993829,7cyclictest5553-21netstat20:44:020
3792993829,7cyclictest5553-21netstat20:44:020
70212370,4sleep0545-21in:imuxsock23:41:270
70212370,4sleep0545-21in:imuxsock23:41:270
3798993616,13cyclictest15084-21df00:03:561
290732360,4sleep30-21swapper/300:39:063
290732360,4sleep30-21swapper/300:39:063
290732360,4sleep30-21swapper/300:39:063
3792993528,5cyclictest5419-21unixbench-2d22:09:050
3792993527,6cyclictest12794-21threads22:29:080
3792993522,12cyclictest3772-21cyclictest21:59:430
3792993522,12cyclictest3772-21cyclictest21:59:430
3792993427,5cyclictest20824-21fschecks_time00:18:580
3792993427,5cyclictest20824-21fschecks_time00:18:580
3792993425,7cyclictest8701-21netstat22:19:010
3792993425,7cyclictest8701-21netstat22:19:010
3798993326,5cyclictest550-21cron20:33:431
3792993324,7cyclictest30206-21threads21:49:050
3792993324,7cyclictest30206-21threads21:49:050
196292330,1sleep119808-21/usr/sbin/munin19:54:081
167172330,3sleep1271rcuc/122:39:091
167172330,3sleep1271rcuc/122:39:091
3798993225,5cyclictest25732-21sshd00:30:541
3798993223,7cyclictest10632-21tr22:24:031
3798993223,7cyclictest10632-21tr22:24:031
3798993223,6cyclictest15532-21netstat19:44:021
3792993226,4cyclictest20672-21processes21:24:050
3792993226,4cyclictest20672-21processes21:24:050
3792993224,6cyclictest9499-21cut23:48:570
3792993224,6cyclictest9499-21cut23:48:570
3792993224,6cyclictest17076-21cut00:08:590
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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