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2026-07-17 - 13:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #e, 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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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
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rackeslot6s.osadl.org (updated Fri Jul 17, 2026 00:44:45)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
148131997064,3cyclictest14-21rcu_preempt19:25:012
14812999703,41cyclictest22-21rcuc/119:15:021
14813199671,3cyclictest0-21swapper/221:05:012
14812999671,22cyclictest183635-21/usr/sbin/munin22:35:191
148127995929,12cyclictest0-21swapper/022:15:010
14812799579,43cyclictest191806-21unixbench_multi23:20:280
14812799563,44cyclictest152600-21latency_hist19:35:010
148127995613,7cyclictest158778-21df_inode20:10:170
148127995522,13cyclictest15-21rcuc/021:40:020
148129995444,5cyclictest0-21swapper/120:05:291
148127995411,26cyclictest0-21swapper/023:50:010
148127995338,13cyclictest131ktimers/019:15:010
14812799531,10cyclictest12-21ksoftirqd/019:40:010
14812799531,10cyclictest12-21ksoftirqd/019:40:010
148127995231,13cyclictest0-21swapper/020:50:010
148129995141,6cyclictest0-21swapper/121:10:001
148127995138,9cyclictest161143-21munin-plugin-st20:25:000
14812799513,46cyclictest0-21swapper/021:30:320
148127995130,14cyclictest167350irq/118-8000000.ethernet-tx021:00:020
148131994941,4cyclictest161982-21munin-plugin-st20:30:002
148131994940,6cyclictest155972-21munin-plugin-st19:55:012
148131994936,10cyclictest204735-21munin-plugin-st00:40:002
14813199492,20cyclictest30-21rcuc/220:05:012
148129994938,6cyclictest178212-21grep22:00:291
14812799495,7cyclictest169778-21latency_hist21:15:010
14812799495,37cyclictest157796-21cat20:05:010
148127994936,8cyclictest164497-21grep20:40:280
14812799493,38cyclictest0-21swapper/000:20:010
14812799492,7cyclictest184620-21sh22:40:210
14812799492,7cyclictest180776-21unixbench_singl22:15:320
14812799492,42cyclictest181403-21grep22:20:270
14812799492,41cyclictest160321-21latency_hist20:20:010
148127994839,6cyclictest0-21swapper/021:25:140
148127994828,13cyclictest0-21swapper/019:40:200
148127994818,8cyclictest0-21swapper/023:35:010
14812799481,3cyclictest149406-21grep19:15:060
148131994738,6cyclictest185137-21munin-plugin-st22:45:012
14813199472,3cyclictest0-21swapper/220:35:012
148129994733,10cyclictest0-21swapper/121:59:591
14812799474,40cyclictest176348-21processes21:50:280
14812799474,40cyclictest176348-21processes21:50:280
148127994734,7cyclictest155873-21grep19:50:280
148127994731,9cyclictest0-21swapper/020:30:010
148127994727,14cyclictest0-21swapper/023:55:190
148131994637,6cyclictest170589-21cron21:20:002
148131994632,7cyclictest150075-21sendmail19:20:002
148131994631,10cyclictest0-21swapper/222:15:322
148129994625,10cyclictest0-21swapper/123:50:021
14812799463,3cyclictest0-21swapper/023:00:300
148127994632,9cyclictest20650irq/252-8000000.ethernet22:00:000
148127994632,9cyclictest0-21swapper/023:05:290
14812799461,17cyclictest12-21ksoftirqd/023:45:010
14812799461,12cyclictest0-21swapper/023:20:010
148131994538,4cyclictest190083-21unixbench_multi23:10:302
148131994535,7cyclictest173053-21unixbench_multi21:30:462
148131994534,6cyclictest0-21swapper/221:05:002
148131994531,10cyclictest0-21swapper/223:20:002
148131994530,8cyclictest0-21swapper/221:55:192
148129994534,7cyclictest0-21swapper/123:10:001
148129994531,10cyclictest0-21swapper/120:20:011
148129994528,12cyclictest231ktimers/119:45:161
148129994527,9cyclictest0-21swapper/120:30:291
14812799458,3cyclictest199192-21cut00:05:240
14812799458,3cyclictest199192-21cut00:05:240
14812799454,13cyclictest12-21ksoftirqd/000:25:020
148127994536,5cyclictest158076-21if_err_eth020:05:220
148127994533,8cyclictest162819-21grep20:30:290
148127994527,12cyclictest0-21swapper/021:40:280
148127994510,33cyclictest189655-21/usr/sbin/munin23:10:210
148131994432,9cyclictest0-21swapper/222:10:292
14812799447,7cyclictest175696-21grep21:45:320
148127994438,3cyclictest0-21swapper/000:00:380
148127994432,7cyclictest0-21swapper/020:35:280
148127994430,8cyclictest0-21swapper/021:15:220
148127994425,14cyclictest0-21swapper/022:55:260
148131994333,6cyclictest0-21swapper/222:55:292
148131994331,8cyclictest0-21swapper/223:20:272
148131994326,8cyclictest0-21swapper/222:05:302
148129994328,12cyclictest231ktimers/100:30:111
148127994328,8cyclictest0-21swapper/022:30:010
14812799432,36cyclictest192242-21fschecks_time23:25:220
14812799431,7cyclictest0-21swapper/000:15:000
148127994313,27cyclictest154810-21/usr/sbin/munin19:45:280
148131994233,5cyclictest0-21swapper/220:15:312
148131994230,7cyclictest0-21swapper/221:45:322
148131994229,6cyclictest0-21swapper/220:05:292
148127994235,4cyclictest20650irq/252-8000000.ethernet22:30:160
148127994230,6cyclictest0-21swapper/022:00:290
148127994229,6cyclictest0-21swapper/000:25:270
148127994215,25cyclictest184262-21sshd22:37:450
148131994132,5cyclictest0-21swapper/223:05:002
148131994129,9cyclictest0-21swapper/200:05:342
148131994129,9cyclictest0-21swapper/200:05:342
148131994129,8cyclictest0-21swapper/200:20:002
148131994117,12cyclictest311ktimers/221:20:132
148129994125,10cyclictest0-21swapper/100:05:351
148129994125,10cyclictest0-21swapper/100:05:341
14812799413,4cyclictest166783-21meminfo20:55:240
14812799412,34cyclictest0-21swapper/023:35:280
14812799411,4cyclictest156968-21date20:00:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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