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2026-03-22 - 02:01

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 all highest latencies:
System rack4slot6s.osadl.org (updated Sun Mar 22, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1679421690,2sleep016795-21who19:20:290
2419221400,3sleep024255-21wc21:55:270
1509221210,3chrt15090-21proc_pri21:20:250
198821170,4chrt1987-21/usr/sbin/munin22:35:260
2142721150,4chrt21425-21entropy19:40:140
2241121120,2sleep022412-21if_eth023:55:150
3152521080,4sleep031575-21df22:25:120
2672721050,3chrt26728-21timerwakeupswit00:10:290
3271921020,4sleep032766-21irqstats00:35:170
124132980,4sleep012424-21ntp_states21:10:210
18782970,4sleep01924-21if_eth020:30:140
229832920,3sleep023052-21uptime21:50:270
268162906,9sleep026814-21ntp_states20:00:240
200092850,4sleep020014-21/usr/sbin/munin23:45:220
176892850,4sleep017747-21ntp_kernel_pll_19:25:200
55622840,4sleep05608-21wc20:45:010
285572845,8sleep0114-21systemd-journal22:13:060
161442845,8sleep016164-21open_inodes23:30:240
44092835,67sleep04472-21awk22:45:160
255052825,65sleep025534-21awk19:55:240
307532810,3sleep030754-21cat22:20:270
265462806,62sleep026356-21/usr/sbin/munin22:05:190
16432795,9sleep0288-21snmpd20:29:500
111722750,2sleep011169-21cat23:10:250
1230026918,28sleep012350-21df19:05:110
164632640,2sleep016465-21cut21:25:250
207172633,8sleep00-21swapper19:35:590
1350099628,20cyclictest23926-21/usr/sbin/munin19:50:260
1350099608,17cyclictest21785-21sshd23:51:560
13500996022,10cyclictest68142sleep020:49:550
1350099599,16cyclictest30888-21/usr/sbin/munin20:15:270
1350099589,15cyclictest8098-21/usr/sbin/munin23:00:270
1350099588,26cyclictest27863-21df20:05:130
1350099588,17cyclictest17130-21/usr/sbin/munin23:35:170
13500995832,17cyclictest8328-21/usr/sbin/munin20:55:150
1350099579,14cyclictest30059-21/usr/sbin/munin00:25:250
1350099578,18cyclictest14881-21/usr/sbin/munin19:15:110
1350099578,17cyclictest21193-21seq21:45:120
1350099578,14cyclictest24890-21/usr/sbin/munin00:05:130
13500995734,15cyclictest6096-21/usr/sbin/munin22:50:290
13500995732,17cyclictest14273-21runrttasks21:17:240
13500995711,14cyclictest11012-21/usr/sbin/munin21:05:180
13500995710,17cyclictest31401-21df_inode00:30:130
190622560,2sleep019080-21open_files19:30:240
1350099569,15cyclictest4262-21systemctl20:40:010
1350099568,17cyclictest20492-21uptime21:40:270
1350099568,17cyclictest18939-21ps21:35:230
1350099567,14cyclictest293932sleep000:20:350
13500995629,18cyclictest9388-21munin-node23:05:090
13500995610,17cyclictest29388-21ntp_states20:10:230
13500995610,16cyclictest14564-21/usr/sbin/munin23:25:180
13500995610,15cyclictest8070-21ls23:00:010
13500995610,14cyclictest13884-21ntp_states19:10:220
13500995610,13cyclictest28922-21/usr/sbin/munin22:15:300
1350099558,17cyclictest6959-21/usr/sbin/munin20:50:190
1350099558,14cyclictest598-21/usr/sbin/munin22:30:200
13500995532,15cyclictest12213-21/usr/sbin/munin23:15:200
13500995531,14cyclictest18646-21/usr/sbin/munin23:40:180
13500995528,16cyclictest25142-21/usr/sbin/munin22:00:150
1350099549,16cyclictest2987-21df22:40:110
1350099548,15cyclictest22642-21/usr/sbin/munin19:45:180
1350099548,13cyclictest182262sleep021:33:020
1350099547,15cyclictest9555-21/usr/sbin/munin21:00:260
1350099547,15cyclictest23600-21chrt00:00:110
13500995431,15cyclictest32307-21runrttasks20:20:300
13500995429,15cyclictest28265-21runrttasks00:17:050
1350099538,16cyclictest13361-21/usr/sbin/munin23:20:140
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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