arrange: system configration

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-.. _system_option:
-
-#######
-Options
-#######
-
-This chapter describe the possibilities of advanced system behavior.
-
-*******
-General
-*******
-
-.. cfgcmd:: set system option ctrl-alt-delete <ignore | reboot | poweroff>
-
-   Action which will be run once the ctrl-alt-del keystroke is received.
-
-.. cfgcmd:: set system option reboot-on-panic
-
-   Automatically reboot system on kernel panic after 60 seconds.
-
-.. cfgcmd:: set system option startup-beep
-
-    Play an audible beep to the system speaker when system is ready.
-
-***********
-HTTP client
-***********
-
-.. cfgcmd:: set system option http-client source-address <address>
-
-   Several commands utilize curl to initiate transfers. Configure the local
-   source IPv4/IPv6 address used for all CURL operations.
-
-.. cfgcmd:: set system option http-client source-interface <interface>
-
-   Several commands utilize curl to initiate transfers. Configure the local
-   source interface used for all CURL operations.
-
-.. note:: `source-address` and `source-interface` can not be used at the same time.
-
-***************
-Keyboard Layout
-***************
-
-When starting a VyOS live system (the installation CD) the configured keyboard
-layout defaults to US. As this might not suite everyones use case you can adjust
-the used keyboard layout on the system console.
-
-.. cfgcmd:: set system option keyboard-layout <us | fr | de | fi | no | dk>
-
-  Change system keyboard layout to given language.
-
-  Defaults to ``us``.
-
-  .. note:: Changing the keymap only has an effect on the system console, using
-    SSH oder Serial remote access to the device is not affected as the keyboard
-    layout here corresponds to your access system.
-
-.. _system_options_performance:
-
-***********
-Performance
-***********
-
-As more and more routers run on Hypervisors, expecially with a :abbr:`NOS
-(Network Operating System)` as VyOS, it makes fewer and fewer sense to use
-static resource bindings like ``smp-affinity`` as present in VyOS 1.2 and
-earlier to pin certain interrupt handlers to specific CPUs.
-
-We now utilize `tuned` for dynamic resource balancing based on profiles.
-
-  .. seealso:: https://access.redhat.com/sites/default/files/attachments/201501-perf-brief-low-latency-tuning-rhel7-v2.1.pdf
-
-.. cfgcmd:: set system option performance < throughput | latency >
-
-  Configure one of the predefined system performance profiles.
-
-  * ``throughput``: A server profile focused on improving network throughput.
-    This profile favors performance over power savings by setting ``intel_pstate``
-    and ``max_perf_pct=100`` and increasing kernel network buffer sizes.
-
-    It enables transparent huge pages, and uses cpupower to set the performance
-    cpufreq governor. It also sets ``kernel.sched_min_granularity_ns`` to 10 us,
-    ``kernel.sched_wakeup_granularity_ns`` to 15 uss, and ``vm.dirty_ratio`` to
-    40%.
-
-  * ``latency``: A server profile focused on lowering network latency.
-    This profile favors performance over power savings by setting ``intel_pstate``
-    and ``min_perf_pct=100``.
-
-    It disables transparent huge pages, and automatic NUMA balancing. It also
-    uses cpupower to set the performance cpufreq governor, and requests a
-    cpu_dma_latency value of 1. It also sets busy_read and busy_poll times to
-    50 us, and tcp_fastopen to 3.