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2026-07-14 - 10:55

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #6

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 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes
Compare latency of primary with shadow system
Characteristics of the 376 highest latencies:
System rack4slot6s.osadl.org (updated Tue Jul 14, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1966422960,3sleep019660-21cat21:55:010
1702221340,4chrt17020-21df_inode23:50:120
3269021230,3chrt32689-21awk22:45:100
303221210,3chrt3031-21/usr/sbin/munin22:55:210
801921120,5chrt8020-21cat21:10:010
223621070,3sleep02239-21users20:45:300
9083210516,71sleep09085-21sshd19:07:130
2269221040,3sleep022724-21users00:10:300
2993621020,3sleep029996-21grep22:35:020
133212990,3sleep013355-21cat19:25:020
202262966,12sleep020294-21sendmail_mailqu19:50:270
101822950,3sleep09564-21/usr/sbin/munin19:10:340
148492895,10sleep014854-21ntp_states21:35:240
57132870,4sleep05720-21missed_timers21:00:200
82142850,4sleep08246-21/usr/sbin/munin23:15:250
300512854,10sleep030102-21/usr/sbin/munin22:35:110
237932855,9sleep023841-21netstat22:10:190
115392845,12sleep0288-21snmpd19:16:110
300932820,4sleep030125-21latency_hist20:30:010
210222827,62sleep021027-21grep22:00:100
263702740,3sleep026425-21wc00:25:270
9468996319,13cyclictest183032chrt19:43:330
9468996016,15cyclictest22315-21/usr/sbin/munin22:05:270
207122600,2sleep020740-21wc00:05:010
133542600,2sleep013352-21fw_packets21:30:130
9468995934,16cyclictest23741-21/usr/sbin/munin00:15:240
9468995934,15cyclictest18551-21/usr/sbin/munin23:55:260
9468995911,19cyclictest27926-21ntpq20:20:200
9468995911,17cyclictest288-21snmpd00:06:120
946899589,22cyclictest11134-21chrt23:25:320
946899589,17cyclictest6681-21awk23:10:120
946899589,16cyclictest9389-21/usr/sbin/munin21:15:290
946899588,17cyclictest8101-21/usr/sbin/munin21:10:270
9468995835,16cyclictest26895-21/usr/sbin/munin20:15:300
9468995833,16cyclictest4460-21/usr/sbin/munin20:55:190
9468995830,17cyclictest27445-21/usr/sbin/munin00:30:170
146072580,3sleep014609-21sh19:30:000
946899579,19cyclictest32702-21sendmail-msp20:40:010
946899579,15cyclictest548-21memory20:40:190
946899579,14cyclictest18612-21/usr/sbin/munin19:45:140
946899578,15cyclictest4058-21/usr/sbin/munin23:00:180
946899577,17cyclictest11994-21/usr/sbin/munin21:25:190
946899577,16cyclictest15868-21/usr/sbin/munin21:40:300
9468995734,15cyclictest27138-21sshd22:23:130
9468995733,17cyclictest15907-21/usr/sbin/munin23:45:190
9468995733,15cyclictest25993-21runrttasks20:13:120
9468995719,15cyclictest22186-21runrttasks19:58:520
259592573,8sleep00-21swapper22:19:210
946899569,15cyclictest19717-21/usr/sbin/munin21:55:160
946899569,12cyclictest113402sleep021:20:410
9468995632,15cyclictest23093-21/usr/sbin/munin20:00:340
9468995632,15cyclictest14986-21/usr/sbin/munin19:30:210
9468995632,15cyclictest14544-21/usr/sbin/munin23:40:150
9468995632,14cyclictest24922-21/usr/sbin/munin00:20:170
9468995631,16cyclictest5499-21/usr/sbin/munin23:05:170
9468995611,15cyclictest13375-21/usr/sbin/munin23:35:220
946899558,14cyclictest9290-21df23:20:120
946899557,17cyclictest17150-21/usr/sbin/munin21:45:250
946899557,16cyclictest288-21snmpd22:41:380
946899557,14cyclictest28581-21/usr/sbin/munin00:35:160
9468995533,14cyclictest16906-21runrttasks19:37:490
9468995530,15cyclictest1615-21/usr/sbin/munin22:50:170
9468995529,16cyclictest30745-21/usr/sbin/munin20:30:280
946899549,15cyclictest2929-21/usr/sbin/munin20:50:210
946899548,19cyclictest23972-21seq20:05:210
946899548,15cyclictest27485-21/usr/sbin/munin22:25:240
946899548,14cyclictest11879-21/usr/sbin/munin23:30:130
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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