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2026-03-11 - 02:09

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 100 highest latencies:
System rack4slot6s.osadl.org (updated Wed Mar 11, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
63821420,3sleep0639-21modprobe22:35:000
1426221160,4chrt14261-21/usr/sbin/munin19:15:220
3132621150,3chrt31328-21ls20:20:280
581621130,3chrt5814-21sort22:55:010
2964021110,4chrt29641-21/usr/sbin/munin22:20:190
2538921090,4sleep025300-21/usr/sbin/munin00:10:150
2951221060,3chrt29513-21egrep20:15:120
1536921060,4sleep015368-21tr21:25:180
2172621045,10sleep021775-21/usr/sbin/munin23:55:260
1145621020,3sleep011504-21if_eth019:05:150
25732920,3sleep02617-21mailstats20:35:270
25352916,12sleep02593-21timerandwakeup22:40:260
72162890,3sleep07261-21grep20:55:020
164482896,11sleep016454-21df_inode21:30:120
219192880,3sleep021944-21grep19:45:180
124032876,66sleep012404-21munin-node23:20:100
83872866,9sleep08402-21munin-run23:05:000
110412850,2sleep011042-21cat23:15:020
255412750,3sleep025538-21ls20:00:010
3852725,12sleep0288-21snmpd00:39:360
37572680,3sleep03759-21awk20:40:200
12583996225,15cyclictest31747-21runrttasks22:29:330
12583996221,29cyclictest17918-21/usr/sbin/munin19:30:130
1258399608,19cyclictest21557-21/usr/sbin/munin21:50:270
12583996035,16cyclictest13913-21/usr/sbin/munin21:20:130
12583996018,13cyclictest30349-21munin-run00:30:010
1258399599,18cyclictest8889-21ntpq21:00:180
1258399599,18cyclictest5922-21/usr/sbin/munin22:55:190
12583995935,16cyclictest20751-21/usr/sbin/munin21:45:250
12583995932,17cyclictest27254-21/usr/sbin/munin20:05:250
1258399589,16cyclictest18851-21/usr/sbin/munin23:45:170
1258399589,15cyclictest7331-21/usr/sbin/munin20:55:170
12583995831,17cyclictest27601-21runrttasks22:12:220
12583995831,17cyclictest26452-21runrttasks20:02:230
12583995821,15cyclictest13907-21latency_hist19:15:010
12583995810,16cyclictest1078-21sshd20:30:180
12583995810,14cyclictest24023-21/usr/sbin/munin00:05:200
1258399579,17cyclictest28234-21/usr/sbin/munin00:20:250
1258399579,16cyclictest11226-21/usr/sbin/munin21:10:260
1258399578,17cyclictest16569-21/usr/sbin/munin19:25:270
1258399578,16cyclictest17869-21sshd21:35:180
1258399578,16cyclictest10123-21memory21:05:180
1258399577,16cyclictest32580-21/usr/sbin/munin20:25:250
12583995733,16cyclictest15291-21/usr/sbin/munin23:30:220
12583995733,15cyclictest24228-21/usr/sbin/munin22:00:140
12583995733,15cyclictest11785-21runrttasks23:16:150
12583995732,16cyclictest16366-21/usr/sbin/munin23:35:160
12583995732,14cyclictest18087-21/usr/sbin/munin23:40:270
12583995713,17cyclictest23347-21/usr/sbin/munin19:50:250
1258399568,18cyclictest20133-21/usr/sbin/munin23:50:150
1258399568,17cyclictest5026-21ntpq20:45:190
1258399568,16cyclictest751-21/usr/sbin/munin22:35:290
1258399568,15cyclictest27801-21ls00:20:020
1258399568,14cyclictest28238-21/usr/sbin/munin22:15:180
1258399566,17cyclictest19139-21/usr/sbin/munin19:35:160
12583995633,14cyclictest19087-21/usr/sbin/munin21:40:150
12583995629,16cyclictest21524-21runrttasks19:44:230
1258399559,16cyclictest13745-21df23:25:120
1258399559,15cyclictest12510-21/usr/sbin/munin21:15:280
1258399558,20cyclictest25757-21ntpq22:05:200
1258399558,16cyclictest8523-21/usr/sbin/munin23:05:270
1258399558,15cyclictest30468-21/usr/sbin/munin00:30:130
12583995531,14cyclictest16150-21runrttasks19:22:370
12583995530,15cyclictest3944-21/usr/sbin/munin22:45:270
12583995528,16cyclictest22909-21/usr/sbin/munin00:00:180
1258399548,14cyclictest23125-21ntp_states21:55:220
12583995430,15cyclictest28244-21/usr/sbin/munin20:10:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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