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145 lines
4.6 KiB
ReStructuredText
145 lines
4.6 KiB
ReStructuredText
.. _system_option:
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######
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Option
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######
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This chapter describe the possibilities of advanced system behavior.
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*******
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General
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*******
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.. cfgcmd:: set system option ctrl-alt-delete <ignore | reboot | poweroff>
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Action which will be run once the ctrl-alt-del keystroke is received.
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.. cfgcmd:: set system option reboot-on-panic
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Automatically reboot system on kernel panic after 60 seconds.
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.. cfgcmd:: set system option startup-beep
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Play an audible beep to the system speaker when system is ready.
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.. cfgcmd:: set system option root-partition-auto-resize
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Enables the root partition auto-extension and resizes to the maximum
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available space on system boot.
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Kernel
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======
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.. cfgcmd:: set system option kernel disable-mitigations
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Disable all optional CPU mitigations. This improves system performance,
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but it may also expose users to several CPU vulnerabilities.
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This will add the following option to the Kernel commandline:
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* ``mitigations=off``
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.. note:: Setting will only become active with the next reboot!
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.. cfgcmd:: set system option kernel disable-power-saving
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Disable CPU power saving mechanisms also known as C states.
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This will add the following two options to the Kernel commandline:
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* ``intel_idle.max_cstate=0`` Disable intel_idle and fall back on acpi_idle
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* ``processor.max_cstate=1`` Limit processor to maximum C-state 1
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.. note:: Setting will only become active with the next reboot!
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***********
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HTTP client
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***********
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.. cfgcmd:: set system option http-client source-address <address>
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Several commands utilize cURL to initiate transfers. Configure the local
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source IPv4/IPv6 address used for all cURL operations.
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.. cfgcmd:: set system option http-client source-interface <interface>
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Several commands utilize curl to initiate transfers. Configure the local
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source interface used for all CURL operations.
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.. note:: `source-address` and `source-interface` can not be used at the same
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time.
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**********
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SSH client
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**********
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.. cfgcmd:: set system option ssh-client source-address <address>
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Use the specified address on the local machine as the source address of the
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connection. Only useful on systems with more than one address.
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.. cfgcmd:: set system option ssh-client source-interface <interface>
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Use the address of the specified interface on the local machine as the
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source address of the connection.
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***************
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Keyboard Layout
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***************
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When starting a VyOS live system (the installation CD) the configured keyboard
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layout defaults to US. As this might not suite everyone's use case you can adjust
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the used keyboard layout on the system console.
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.. cfgcmd:: set system option keyboard-layout <us | fr | de | fi | no | dk>
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Change system keyboard layout to given language.
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Defaults to ``us``.
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.. note:: Changing the keymap only has an effect on the system console, using
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SSH or Serial remote access to the device is not affected as the keyboard
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layout here corresponds to your access system.
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.. _system_options_performance:
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***********
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Performance
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***********
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As more and more routers run on Hypervisors, expecially with a :abbr:`NOS
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(Network Operating System)` as VyOS, it makes fewer and fewer sense to use
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static resource bindings like ``smp-affinity`` as present in VyOS 1.2 and
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earlier to pin certain interrupt handlers to specific CPUs.
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We now utilize `tuned` for dynamic resource balancing based on profiles.
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.. stop_vyoslinter
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.. seealso:: https://access.redhat.com/sites/default/files/attachments/201501-perf-brief-low-latency-tuning-rhel7-v2.1.pdf
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.. start_vyoslinter
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.. cfgcmd:: set system option performance < throughput | latency >
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Configure one of the predefined system performance profiles.
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* ``throughput``: A server profile focused on improving network throughput.
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This profile favors performance over power savings by setting
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``intel_pstate`` and ``max_perf_pct=100`` and increasing kernel network
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buffer sizes.
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It enables transparent huge pages, and uses cpupower to set the performance
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cpufreq governor. It also sets ``kernel.sched_min_granularity_ns`` to 10 us,
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``kernel.sched_wakeup_granularity_ns`` to 15 uss, and ``vm.dirty_ratio`` to
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40%.
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* ``latency``: A server profile focused on lowering network latency.
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This profile favors performance over power savings by setting
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``intel_pstate`` and ``min_perf_pct=100``.
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It disables transparent huge pages, and automatic NUMA balancing. It also
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uses cpupower to set the performance cpufreq governor, and requests a
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cpu_dma_latency value of 1. It also sets busy_read and busy_poll times to
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50 us, and tcp_fastopen to 3.
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