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2025-06-18 - 17:52

OSADL QA Farm on Real-time of Mainline Linux

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Default latency plot of shadow in rack #5, slot #7

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: 50.5 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 50 highest latencies:
System rack5slot7s.osadl.org (updated Wed Jun 18, 2025 12:45:08)
Delayed (victim)Switcher (culprit)TimestampCPU
PIDPrioTotal
latency
(µs)
T*(,W**)
latency
(µs)
CmdPIDPrioCmd
17858224492195,97sleep00-21swapper07:07:400
181639916618,28cyclictest32268-21memory08:35:450
181639916414,25cyclictest705-21sshd11:54:340
181639916116,121cyclictest8980-21/usr/sbin/munin09:30:050
181639915716,98cyclictest3700-21apt-get09:01:590
181639915713,120cyclictest26977-21awk08:02:060
18163991568,124cyclictest6335-21apt-get09:15:420
181639915618,115cyclictest2336-21munin-run12:05:010
181639915516,41cyclictest30186-21diskstats11:35:340
181639915516,25cyclictest29526-21munin-run08:20:020
181639915515,100cyclictest19896-21apt-get10:36:050
181639915514,116cyclictest19004-21apt-key07:15:100
181639915419,93cyclictest16408-21apt-get10:15:300
181639915418,107cyclictest6448-21apt-get12:30:170
181639915417,98cyclictest3704-21munin-run09:00:030
181639915416,115cyclictest11618-21munin-plugin-st09:45:010
181639915415,25cyclictest13236-21sort09:55:030
181639915414,25cyclictest5555-21munin-run12:25:010
181639915316,115cyclictest27326-21df08:05:340
181639915316,112cyclictest19898-21munin-run10:35:040
181639915310,119cyclictest8111-21grep09:21:130
181639915310,115cyclictest28158-21apt-get11:26:280
181639915310,104cyclictest13973-21sshd09:56:340
18163991529,119cyclictest23496-21wc10:55:240
181639915217,24cyclictest20680-21/usr/sbin/munin07:25:260
181639915216,112cyclictest9100-21apt-get09:30:280
181639915215,21cyclictest24695-21diskstats07:50:340
181639915215,114cyclictest31135-21munin-run08:30:010
181639915214,25cyclictest3130-21munin-run12:10:010
181639915122,102cyclictest1280-21apt-get08:45:360
181639915111,22cyclictest15612-21apt10:10:010
181639915111,114cyclictest32178-21mailstats11:45:590
181639915036,22cyclictest25333-21/usr/sbin/munin11:05:500
181639915020,25cyclictest18969-21munin-node07:15:150
181639915019,24cyclictest1134-21ntp_states11:55:510
181639915016,23cyclictest501-21diskstats08:40:330
181639915014,25cyclictest11958-21memory09:45:440
181639915014,23cyclictest25491-21diskstats07:55:340
181639915014,23cyclictest10806-21munin-run09:40:030
181639915013,97cyclictest112-21systemd-journal10:41:330
181639915013,114cyclictest22746-21diskstats10:50:330
181639915010,23cyclictest14123-21/usr/sbin/munin10:00:140
181639914916,36cyclictest2322-21diskstats08:50:410
181639914915,113cyclictest30999-21df_inode11:40:280
181639914914,113cyclictest23902-21diskstats07:45:340
18163991489,27cyclictest31939-21latency_hist08:35:030
18163991489,114cyclictest4452-21wc12:15:590
181639914817,30cyclictest5766-21diskstats12:25:360
181639914816,23cyclictest15812-21df10:10:290
181639914814,25cyclictest28727-21latency_hist08:15:030
*Timer  **Wakeup  (latency=timer+wakeup+contextswitch)

 

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