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2026-05-13 - 11:09

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 all highest latencies:
System rackfslot4s.osadl.org (updated Wed May 13, 2026 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
1829721310,2chrt18299-21aten2.4_rfpower23:05:340
546221300,2sleep05465-21latency_hist23:35:090
3113921240,3chrt31140-21cpu19:15:260
1180721210,2chrt11806-21/usr/sbin/munin22:55:460
1633921200,2chrt16338-21/usr/sbin/munin21:25:570
1165721180,2sleep011658-21seq23:43:550
2333821170,2sleep023339-21seq23:12:230
1987621160,2chrt19872-21ssh22:19:430
3259521150,2sleep032596-21runrttasks22:37:560
2836121140,3chrt28362-21seq22:31:510
2834321140,2chrt28345-21sleep21:43:440
2188921130,3chrt21888-21chrt22:22:080
2833821110,2chrt28339-21sleep20:01:240
550321100,2sleep05504-21runrttasks00:23:140
320421100,4chrt3205-21sh20:14:110
3032921090,2chrt30330-21ssh23:23:080
1755221090,4chrt17553-21runrttasks19:45:170
1525421090,2chrt15256-21sh23:49:370
690121080,1sleep06902-21irqrtprio21:12:060
191821070,2chrt1921-21switchtime21:52:250
1084621070,2chrt10848-21sh22:06:040
2646321060,3sleep026464-21sendmail_mailtr23:17:150
2085221060,1sleep020853-21cat23:57:200
1611021050,3chrt16111-21runrttasks00:39:470
2172421040,2chrt21725-21sh21:33:590
2516521030,2chrt25166-21sh21:39:130
2499821030,2chrt24999-21sh20:49:170
28422990,2sleep02843-21seq00:19:520
84962970,2sleep08497-21seq23:39:210
123572970,2sleep012358-21chrt00:33:420
274882950,2sleep027491-21grep00:07:210
246692940,1sleep024670-21cut22:26:110
109222910,1sleep010924-21runrttasks19:35:030
179202840,2sleep017921-21seq23:53:030
175152820,2sleep017516-21chrt23:04:180
163492820,2sleep016350-21seq22:14:380
314612810,3sleep031462-21cat20:06:260
51802750,2sleep05182-21tr21:57:190
289092740,2sleep028910-21runrttasks19:11:010
2763690745,11cyclictest2572-21ntpq22:41:310
2763690735,9cyclictest26784-21ntpq20:51:210
2763690735,12cyclictest7437-21ssh22:01:050
2763690735,11cyclictest14436-21seq19:40:150
27636907313,16cyclictest13825-21ntpq21:21:500
27636907312,16cyclictest0-21swapper00:03:420
2763690726,19cyclictest6539-21ssh00:25:290
2763690725,12cyclictest29565-21diskstats21:45:510
2763690725,11cyclictest7875-21sleep22:50:020
170522720,2sleep017053-21/usr/sbin/munin20:35:460
2763690715,10cyclictest8140-21ntp_states20:21:190
2763690713,10cyclictest9932-21/usr/sbin/munin20:25:240
27636907011,17cyclictest1320-21ssh23:28:300
2763690695,12cyclictest30420-21ntpq00:11:510
2763690694,11cyclictest2844-21ntp_states19:21:160
2763690694,10cyclictest3691-21/usr/sbin/munin20:15:500
2763690685,10cyclictest511-21ntpq21:01:140
27636906817,11cyclictest15519-21runrttasks20:33:490
27636906816,16cyclictest8963-21apt-get21:15:200
2763690666,10cyclictest2693-21diskstats21:05:310
2763690664,9cyclictest12883-21ntp_states19:37:080
2763690664,12cyclictest24809-21ntpq19:55:580
2763690654,10cyclictest9285-21ntpq22:51:230
2763690654,10cyclictest6154-21python319:26:270
2763690654,10cyclictest20971-21diskstats19:50:310
255022617,41sleep024625-21/usr/sbin/munin19:05:360
296012550,1sleep029602-21chrt20:55:510
2763690434,11cyclictest20506-21ntp_states20:41:170
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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