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.. _system_options:
#######
Options
#######
This chapter describe the possibilities of advanced system behavior.
*******
General
*******
.. cfgcmd:: set system options beep-if-fully-booted
Send an audible beep to the system speaker when system is ready.
.. cfgcmd:: set system options ctrl-alt-del-action [ ignore | reboot | poweroff ]
Action which will be run once the ctrl-alt-del keystroke is received.
.. cfgcmd:: set system options reboot-on-panic
Automatically teboot system on kernel panic after 60 seconds.
***********
HTTP client
***********
.. cfgcmd:: set system options 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 options 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.
***********
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 options 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.
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