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2025-11-14 - 12:34

OSADL QA Farm on Real-time of Mainline Linux

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

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
Compare latency of primary with shadow system
Characteristics of the highest latencies:
System rackfslot4s.osadl.org (updated Fri Nov 14, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1546821240,3chrt15464-21ntpq00:27:110
152821240,2chrt1526-21ssh22:06:480
3178621220,3chrt31787-21sleep21:05:200
595521170,2chrt5953-21ntp_offset21:16:460
3061621150,2chrt30617-21awk22:01:060
2579221090,2chrt25788-21telnet22:50:360
2832121040,3chrt28323-21awk19:55:250
2657721040,3chrt26579-21sort20:55:020
69721010,2chrt698-21sh20:04:440
270352890,1sleep027038-21wc19:51:290
173942890,2sleep017395-21cat23:33:110
185222880,1sleep018523-21grep21:40:010
165722860,2sleep016569-21aten2.4-expect20:35:300
77522850,1sleep07750-21aten2.4-expect21:20:360
292772800,2sleep029279-21uname22:56:100
34842797,16sleep03555-21irqstats19:05:330
187142780,1sleep018716-21cut23:35:540
130192780,2sleep013021-21grep23:25:540
40452750,3sleep04043-21if_eth020:10:450
300522630,2sleep030053-21smartctl23:56:020
264132620,2sleep026414-21sh23:49:420
204912580,2sleep020489-21grep19:40:040
5218905219,24cyclictest0-21swapper21:14:070
5218905119,23cyclictest0-21swapper22:22:410
68922500,3chrt6888-21/usr/sbin/munin22:16:170
5218905021,22cyclictest0-21swapper21:43:260
5218905019,22cyclictest0-21swapper00:37:460
5218905015,17cyclictest11418-21ssh21:26:280
240542500,2sleep024056-21sort20:50:020
188692500,2sleep018873-21rm22:37:390
5218904921,19cyclictest881-21ntpq00:01:180
5218904920,21cyclictest0-21swapper23:13:470
5218904919,21cyclictest0-21swapper00:19:060
5218904918,22cyclictest0-21swapper22:34:000
237012490,1sleep023746-21cut23:45:090
5218904818,22cyclictest0-21swapper21:53:490
5218904817,23cyclictest0-21swapper00:05:080
5218904721,17cyclictest9749-21apt-get23:20:250
5218904714,23cyclictest22914-21ssh22:45:270
213062470,2sleep021367-21grep20:45:050
5218904623,14cyclictest8110-21ssh00:15:090
5218904617,20cyclictest0-21swapper22:44:240
5218904616,20cyclictest13824-21/usr/sbin/munin20:30:420
5218904615,21cyclictest0-21swapper23:09:210
5218904613,22cyclictest0-21swapper22:25:090
5218904521,16cyclictest0-21swapper21:49:250
5218904514,22cyclictest0-21swapper22:13:310
5218904514,21cyclictest0-21swapper23:04:150
5218904513,22cyclictest12367-21ntpq20:26:030
5218904512,15cyclictest18536-21users00:32:230
5218904512,13cyclictest2443-21users20:06:320
521890444,29cyclictest26762-21ssh23:50:270
5218904420,17cyclictest8833-21ntp_kernel_err19:15:570
5218904419,16cyclictest6951-21apt-get23:15:200
5218904412,23cyclictest5334-21/usr/sbin/munin19:11:340
521890435,27cyclictest11282-21ssh00:20:280
5218904323,13cyclictest25423-21cron19:50:010
5218904320,15cyclictest15780-21diskstats19:30:310
5218904317,19cyclictest6174-21aten2.4_rfpower20:15:280
5218904313,22cyclictest29237-21/usr/sbin/munin21:00:290
5218904313,21cyclictest0-21swapper21:33:490
5218904312,22cyclictest9769-21sed20:21:340
5218904311,13cyclictest27600-21perl21:55:540
5218904220,13cyclictest10424-21/usr/sbin/munin19:20:290
5218904216,16cyclictest12944-21apt-get19:25:160
5218904212,22cyclictest21904-21mailstats19:41:320
521890415,8cyclictest26684-21apt-get20:55:190
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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