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2026-08-20 - 11:14

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #4, slot #1

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: 100 million
Resolution of latency scale: normal
Duration: 5 hours, 33 minutes, lowest P state: performance
Compare latency of primary with shadow system
Characteristics of the 100 highest latencies:
System rack4slot1s.osadl.org (updated Thu Aug 20, 2026 00:44:12)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
843521330,3chrt0-21swapper/222:44:072
2086321220,2chrt0-21swapper/020:24:120
2086321220,2chrt0-21swapper/020:24:120
161002930,2sleep20-21swapper/223:04:132
90612920,2sleep20-21swapper/200:14:002
90612920,2sleep20-21swapper/200:14:002
23442840,3sleep30-21swapper/322:29:053
90702660,2sleep10-21swapper/122:44:151
10232650,2sleep11024-21sh22:24:131
10232650,2sleep11024-21sh22:24:131
248392620,3sleep30-21swapper/322:02:123
248392620,3sleep30-21swapper/322:02:123
319742540,1chrt31975-21/usr/sbin/munin20:54:081
207182540,4sleep30-21swapper/321:49:133
207182540,4sleep30-21swapper/321:49:133
228812530,3sleep022054-21/usr/sbin/munin20:29:140
33832510,3sleep30-21swapper/321:04:113
26643995132,14cyclictest0-21swapper/000:03:560
26643995132,14cyclictest0-21swapper/000:03:560
183722490,8sleep20-21swapper/221:44:112
183722490,8sleep20-21swapper/221:44:112
26643994841,4cyclictest0-21swapper/000:04:140
26643994841,4cyclictest0-21swapper/000:04:140
247982450,6sleep124797-21df_inode23:29:051
247982450,6sleep124797-21df_inode23:29:051
22562450,3sleep20-21swapper/222:29:052
304522430,3sleep026642-21cyclictest23:44:070
181752410,2sleep018246-21kernelversion21:44:090
181752410,2sleep018246-21kernelversion21:44:090
169572410,3sleep20-21swapper/220:14:102
2664699398,12cyclictest5160-40mandb00:04:171
2664699398,12cyclictest5160-40mandb00:04:171
214652390,2sleep10-21swapper/123:19:081
214652390,2sleep10-21swapper/123:19:081
26643993829,7cyclictest13163-21cron22:58:540
26643993829,7cyclictest13163-21cron22:58:540
246212380,3sleep10-21swapper/120:34:101
246212380,3sleep10-21swapper/120:34:101
17982380,3sleep30-21swapper/319:34:063
17982380,3sleep30-21swapper/319:34:063
87602370,1sleep00-21swapper/021:19:070
87602370,1sleep00-21swapper/021:19:070
240082370,2sleep124003-21grep21:59:121
240082370,2sleep124003-21grep21:59:121
36502360,2chrt3651-21/usr/sbin/munin19:39:061
36502360,2chrt3651-21/usr/sbin/munin19:39:061
267512360,2sleep126754-21fschecks_count23:34:031
26646993529,4cyclictest735-21systemd-logind00:03:551
26646993529,4cyclictest735-21systemd-logind00:03:551
26646993428,4cyclictest7554-21systemctl22:43:541
26646993428,4cyclictest7554-21systemctl22:43:541
26643993428,4cyclictest7619-21cut00:09:100
26643993428,4cyclictest7619-21cut00:09:100
26646993325,6cyclictest0-21swapper/123:24:121
26646993325,6cyclictest0-21swapper/123:24:121
26643993324,7cyclictest404-21netstat23:49:110
127152330,3chrt0-21swapper/000:23:550
127152330,3chrt0-21swapper/000:23:550
296382320,3sleep128954-21/usr/sbin/munin22:14:121
296382320,3sleep128954-21/usr/sbin/munin22:14:121
2664699328,11cyclictest20407-21taskset23:14:571
26646993225,5cyclictest1410-21/usr/sbin/munin19:34:111
26646993225,5cyclictest1410-21/usr/sbin/munin19:34:111
26643993227,3cyclictest31171-21cut22:19:070
26643993227,3cyclictest31171-21cut22:19:070
26643993225,5cyclictest9235-21sshd22:46:130
26643993222,8cyclictest24940-21fschecks_time23:29:060
26643993222,8cyclictest24940-21fschecks_time23:29:060
26643993222,7cyclictest28477-21processes20:44:130
26643993222,7cyclictest28477-21processes20:44:130
2664699316,11cyclictest3067-21seq23:56:371
26646993125,5cyclictest9750-21processes19:54:131
26646993125,3cyclictest0-21swapper/121:28:531
26646993110,7cyclictest31584-21/usr/sbin/munin23:44:181
26643993127,3cyclictest19369-21gltestperf23:14:070
26646993025,3cyclictest0-21swapper/122:13:541
26646993025,3cyclictest0-21swapper/122:13:541
26646993023,5cyclictest11161-21cut00:19:051
26646993023,5cyclictest11161-21cut00:19:051
26646993021,7cyclictest0-21swapper/100:14:131
26646993021,7cyclictest0-21swapper/100:14:131
26643993023,5cyclictest30385-21sshd22:16:130
26643993023,5cyclictest30385-21sshd22:16:130
2666199293,17cyclictest5285-21chrt00:03:592
2666199293,17cyclictest5285-21chrt00:03:592
2664699295,8cyclictest17392-21/usr/sbin/munin20:14:151
26646992925,3cyclictest12446-21wc20:03:531
26646992925,3cyclictest12446-21wc20:03:531
26646992925,3cyclictest12446-21wc20:03:531
26646992924,3cyclictest28218-21latency20:44:091
26646992924,3cyclictest28218-21latency20:44:091
26646992922,5cyclictest22314-21fschecks_time20:29:071
26646992920,7cyclictest20514-21cut21:49:111
26646992920,7cyclictest20514-21cut21:49:111
26643992923,5cyclictest23536-21ntp_kernel_err23:24:100
26643992923,5cyclictest23536-21ntp_kernel_err23:24:100
26643992923,4cyclictest12470-21sendmail20:03:530
26643992923,4cyclictest12470-21sendmail20:03:530
26643992923,4cyclictest12470-21sendmail20:03:530
26643992922,5cyclictest30058-21cron23:43:540
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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