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2025-09-16 - 06:20

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 376 highest latencies:
System rackfslot4s.osadl.org (updated Tue Sep 16, 2025 00:44:34)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
2654321220,2chrt26544-21ssh21:24:360
2089021180,2chrt20888-21ntpq22:11:450
422821170,3chrt4229-21sleep00:37:070
1257821070,2chrt12579-21sleep23:54:060
3070221010,2sleep030703-21ssh22:30:160
2280121000,2sleep022805-21uniq19:10:350
273042960,2sleep027306-21cut21:25:510
9782920,1sleep0979-21latency21:36:120
143082860,2sleep014307-21ld23:56:400
288652840,2sleep028867-21grep19:21:270
91242830,2sleep09125-21uname20:50:490
271622800,2sleep027163-21gcc23:21:340
51042790,1sleep05105-21sh21:43:320
212122730,2sleep021215-21cut23:11:060
81752720,2sleep08177-21grep22:47:160
321202720,1sleep032121-21sh21:34:350
115902680,2sleep011592-21grep21:55:400
137152670,2sleep013718-21sort22:57:150
9692600,1sleep0968-21sed00:31:120
205522542,43sleep020593-21cut20:10:270
157922542,5sleep015694-21ssh00:00:060
50202533,42sleep05024-21ssh22:41:370
178792533,7sleep017832-21ssh22:06:130
259022502,7sleep025899-21users00:17:230
288442490,2sleep028849-21uname22:26:080
22247904917,25cyclictest0-21swapper22:18:210
5832480,1sleep0632-21if_eth219:30:420
321792483,38sleep032182-21ssh00:29:390
22247904817,23cyclictest0-21swapper23:49:470
141682480,3chrt14166-21/usr/sbin/munin19:56:210
97402473,34sleep09732-21ntpq21:51:390
241822472,36sleep024184-21ntp_states20:16:150
22247904717,21cyclictest0-21swapper23:08:340
182652472,6sleep018257-21ssh21:10:020
166292470,4chrt16507-21ssh23:02:220
78782462,5sleep07854-21apt-get19:45:180
22247904619,20cyclictest0-21swapper22:38:120
22247904616,21cyclictest0-21swapper23:19:540
22247904613,26cyclictest0-21swapper20:05:410
2092024612,19sleep020929-21ntpq19:05:570
22247904520,18cyclictest16637-21ssh22:05:010
22247904518,19cyclictest0-21swapper00:24:260
22247904516,22cyclictest0-21swapper22:24:510
22247904516,21cyclictest0-21swapper00:05:060
2224790445,19cyclictest9862-21hddtemp_smartct22:50:550
22247904416,22cyclictest0-21swapper23:37:350
22247904415,22cyclictest0-21swapper19:36:070
22247904414,22cyclictest0-21swapper00:12:580
2224790436,10cyclictest16536-21ntpq20:01:050
2224790435,19cyclictest29091-21df_inode23:25:420
22247904318,17cyclictest18848-21ssh21:10:550
22247904315,21cyclictest0-21swapper21:17:390
22247904314,22cyclictest0-21swapper23:33:070
2224790424,18cyclictest10701-21diskstats19:50:330
22247904215,10cyclictest4498-21ssh23:40:070
2224790415,8cyclictest11095-21df20:55:260
2224790415,18cyclictest6969-21ntpq21:46:390
2224790414,10cyclictest923-21grep20:35:280
2224790414,10cyclictest4391-21ntpq20:41:130
58372400,2sleep05838-21aten2.4_rfpower20:45:240
2224790405,27cyclictest13360-21/usr/sbin/munin21:01:060
22247904014,9cyclictest28567-21hddtemp_smartct20:25:370
2224790397,11cyclictest25355-21hddtemp_smartct19:15:380
2224790393,17cyclictest5655-21diskstats19:40:330
22247903815,17cyclictest27443-21runrttasks20:23:000
22247903814,9cyclictest31023-21gcc19:26:020
22247903811,10cyclictest31677-21ntpq20:31:000
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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