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2026-06-02 - 05:00

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 Tue Jun 02, 2026 00:44:00)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2768723010,3sleep027690-21open_inodes21:50:240
2213722600,3sleep022136-21latency_hist21:30:010
773022380,2sleep07728-21ls22:40:020
1203722160,2sleep012035-21load20:50:160
1076321560,3sleep010785-21cat20:45:200
2518721430,2sleep025188-21ntpq19:35:230
1434521200,4chrt14343-21df_inode23:05:140
2023121170,2sleep020232-21cat19:15:250
435221140,3chrt4350-21ntp_kernel_pll_20:20:220
3127521120,3chrt31274-21wc20:00:010
550721090,3chrt5510-21if_err_eth020:25:120
153921010,5sleep01610-21fgrep00:20:260
1858821000,3sleep018603-21latency19:10:170
63242960,3sleep06325-21cut00:40:020
147772900,3sleep014849-21grep21:00:250
132842895,9sleep013142-21/usr/sbin/munin20:55:200
81572870,4sleep08226-21processes22:40:250
299412870,4sleep030005-21latency_hist19:55:010
168572846,9sleep016905-21df23:15:130
283782830,2sleep028379-21modprobe00:00:010
156322836,64sleep015568-21/usr/sbin/munin23:10:160
233072770,2sleep023308-21cat23:40:020
1735427519,32sleep017410-21ntpq19:05:180
316672735,56sleep018340-21cyclictest20:00:250
290152730,3sleep029017-21timerandwakeup00:00:270
18345997231,16cyclictest4252-21/usr/sbin/munin00:30:260
1834599609,19cyclictest23489-21/usr/sbin/munin21:35:290
1834599609,16cyclictest22202-21/usr/sbin/munin21:30:290
1834599599,16cyclictest24800-21/usr/sbin/munin21:40:140
18345995923,28cyclictest17501-21/usr/sbin/munin21:10:270
126512593,5sleep00-21swapper22:58:310
1834599589,17cyclictest23387-21/usr/sbin/munin23:40:110
1834599589,15cyclictest32655-21/usr/sbin/munin20:05:180
1834599588,17cyclictest3957-21tr20:20:000
1834599587,20cyclictest5241-21/usr/sbin/munin22:30:300
18345995835,15cyclictest21331-21/usr/sbin/munin23:30:290
18345995833,18cyclictest28731-21/usr/sbin/munin21:55:150
1834599579,17cyclictest9118-21/usr/sbin/munin22:45:180
1834599578,16cyclictest4145-21memory22:25:200
18345995734,15cyclictest32581-21runrttasks22:10:110
18345995733,15cyclictest27972-21/usr/sbin/munin19:45:280
18345995733,15cyclictest13317-21/usr/sbin/munin23:00:230
18345995732,17cyclictest18503-21/usr/sbin/munin23:20:240
18345995732,16cyclictest26287-21/usr/sbin/munin19:40:150
18345995730,16cyclictest29913-21/usr/sbin/munin00:05:160
18345995716,14cyclictest276-21runrttasks00:11:210
18345995710,15cyclictest976-21sshd00:19:260
1834599569,13cyclictest9291-21/usr/sbin/munin20:40:330
1834599568,14cyclictest2545-21df00:25:130
18345995632,15cyclictest25187-21/usr/sbin/munin23:45:300
18345995630,15cyclictest31972-21runrttasks22:06:270
18345995625,22cyclictest24854-21latency_hist19:35:020
18345995611,18cyclictest23495-21awk19:30:000
18345995610,16cyclictest26429-21/usr/sbin/munin21:45:260
18345995610,15cyclictest1479-21/usr/sbin/munin20:10:250
1834599558,14cyclictest7978-21/usr/sbin/munin20:35:260
1834599558,14cyclictest22211-21munin-run19:25:010
1834599557,16cyclictest30142-21load22:00:170
1834599556,17cyclictest19639-21/usr/sbin/munin21:20:150
18345995531,16cyclictest7092-21/usr/sbin/munin20:30:260
18345995531,15cyclictest27145-21latency_hist23:55:020
18345995530,16cyclictest18391-21df_inode21:15:170
18345995510,15cyclictest1355-21/usr/sbin/munin22:15:210
1834599547,15cyclictest20279-21seq23:27:170
18345995432,15cyclictest11367-21runrttasks22:53:290
18345995429,16cyclictest15923-21/usr/sbin/munin21:05:200
1834599539,16cyclictest2820-21irqstats22:20:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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