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wiki:system_configuration [2025/04/13 16:41] – [rtcqs] autostaticwiki:system_configuration [2026/01/29 20:45] (current) – [cyclictest] autostatic
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   rtcqs - version 0.6.6   rtcqs - version 0.6.6
 +  
   Root User   Root User
   =========   =========
   [ OK ] Not running as root.   [ OK ] Not running as root.
 +  
   Group Limits   Group Limits
   ============   ============
   [ OK ] User music is member of a group that has sufficient rtprio (95) and memlock (unlimited) limits set.   [ OK ] User music is member of a group that has sufficient rtprio (95) and memlock (unlimited) limits set.
 +  
   CPU Frequency Scaling   CPU Frequency Scaling
   =====================   =====================
   [ OK ] The scaling governor of all CPUs is set to performance.   [ OK ] The scaling governor of all CPUs is set to performance.
 +  
   Simultaneous Multithreading   Simultaneous Multithreading
   ===========================   ===========================
   [ OK ] Simultaneous Multithreading (SMT, also called hyper-threading) is disabled.   [ OK ] Simultaneous Multithreading (SMT, also called hyper-threading) is disabled.
 +  
   Kernel Configuration   Kernel Configuration
   ====================   ====================
   [ OK ] Valid kernel configuration found.   [ OK ] Valid kernel configuration found.
 +  
   High Resolution Timers   High Resolution Timers
   ======================   ======================
   [ OK ] High resolution timers are enabled.   [ OK ] High resolution timers are enabled.
 +  
   Tickless Kernel   Tickless Kernel
   ===============   ===============
   [ OK ] System is using a tickless kernel.   [ OK ] System is using a tickless kernel.
 +  
   Preempt RT   Preempt RT
   ==========   ==========
   [ OK ] Kernel 6.13.8-4-liquorix-amd64 is using threaded IRQs.   [ OK ] Kernel 6.13.8-4-liquorix-amd64 is using threaded IRQs.
 +  
   Spectre/Meltdown Mitigations   Spectre/Meltdown Mitigations
   ============================   ============================
   [ OK ] Spectre/Meltdown mitigations are disabled. Be warned that this makes your system more vulnerable to Spectre/Meltdown attacks.   [ OK ] Spectre/Meltdown mitigations are disabled. Be warned that this makes your system more vulnerable to Spectre/Meltdown attacks.
 +  
   RT Priorities   RT Priorities
   =============   =============
   [ OK ] Realtime priorities can be set.   [ OK ] Realtime priorities can be set.
 +  
   Swappiness   Swappiness
   ==========   ==========
   [ OK ] Your system is configured without swap, setting swappiness does not apply.   [ OK ] Your system is configured without swap, setting swappiness does not apply.
 +  
   Filesystems   Filesystems
   ===========   ===========
   [ OK ] The following mounts can be used for audio purposes: /   [ OK ] The following mounts can be used for audio purposes: /
 +  
   IRQs   IRQs
   ====   ====
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   [ OK ] USB port xhci_hcd with IRQ 49 does not share its IRQ.   [ OK ] USB port xhci_hcd with IRQ 49 does not share its IRQ.
   [ OK ] USB port xhci_hcd with IRQ 47 does not share its IRQ.   [ OK ] USB port xhci_hcd with IRQ 47 does not share its IRQ.
 +  
   Power Management   Power Management
   ================   ================
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 {{:wiki:htop_2023-10-15.png|Terminal running htop}} {{:wiki:htop_2023-10-15.png|Terminal running htop}}
  
-==== latencytop ====+==== LatencyTOP ====
  
-''latencytop'' is a very useful tool to find out what process is causing system latency to happen.+[[https://www.latencytop.org/|LatencyTOP]] is a very useful tool to find out what processes are causing system latency to happen. LatencyTOP only works on kernels that have ''CONFIG_LATENCYTOP'' enabled. This would mean building your own kernel as practically all packaged kernels do not have this feature enabled by default.
  
 {{:wiki:latencytop.png|latencytop}} {{:wiki:latencytop.png|latencytop}}
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 Just as ''latencytop'' measures system latencies, ''[[https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/cyclictest/start|cyclictest]]'' measures kernel latencies. ''cyclictest'' has quite some options but one of the most used ways to run the command is: Just as ''latencytop'' measures system latencies, ''[[https://wiki.linuxfoundation.org/realtime/documentation/howto/tools/cyclictest/start|cyclictest]]'' measures kernel latencies. ''cyclictest'' has quite some options but one of the most used ways to run the command is:
-  #  cyclictest -t1 -p 80 -n -i 10000 -l 10000 -m +  #  cyclictest -t1 -p 80 -i 10000 -l 10000 -m 
-One single thread (''-t1''), priority of 80 (''-p 80''), use clock_nanosleep (''-n''), use 10000 us base interval of thread (''-i 1000''), use 1000 loops and then exit (''-l 10000''), lock current and future memory allocations (''-m''). More on clock_nanosleep can be found in its manpage (''man clock_nanosleep'').+One single thread (''-t1''), priority of 80 (''-p 80''), use 10000 µs base interval of thread (''-i 10000''), use 10000 loops and then exit (''-l 10000''), lock current and future memory allocations (''-m''). ''cyclictest'' uses clock_nanosleep by default. More on clock_nanosleep can be found in its manpage (''man clock_nanosleep'').
  
 Other examples of the usage of ''cyclictest'': Other examples of the usage of ''cyclictest'':
wiki/system_configuration.1744562491.txt.gz · Last modified: by autostatic