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Add kernel options which apply during the boot:
- isolcpus
- nohz_full
- rcu_nocbs
- default_hugepagesz
- hugepages
- hugepagesz
- numa_balancing
- hpet
- mce
- nosoftlockup
- nmi_watchdog
CLI:
```
set system option kernel cpu disable-nmi-watchdog
set system option kernel cpu isolate-cpus '1,2,4-5'
set system option kernel cpu nohz-full '1,2,4-5'
set system option kernel cpu rcu-no-cbs '1,2,4-5'
set system option kernel disable-hpet
set system option kernel disable-mce
set system option kernel disable-softlockup
set system option kernel memory default-hugepage-size '2M'
set system option kernel memory disable-numa-balancing
set system option kernel memory hugepage-size 1G hugepage-count '2'
set system option kernel memory hugepage-size 2M hugepage-count '512'
```
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Add option to limit the number of messages that are displayed on the console
during the boot process and to persist this setting with image upgrades.
set system option kernel quiet
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When performing an image upgrade and Linux Kernel command-line option that
should be passed via GRUB to the Linux Kernel are missing on the first boot.
This is because when generating the GRUB command-line via the op-mode scripts
the CLI nodes defining the options are not honored.
This commit re-implements the code-path in op-mode which generates the strings
passed via GRUB to the Linux Kernel command-line.
NOTE: If (for a yet unknown reason) a Kernel command-line option string changes
during a major - or minor - upgrade of the Linux Kernel, we will need to adapt
that logic and possibly call a helper from within the NEW updated image rootfs.
Thus we can ship future information back into the past like the "Grays Sports
Almanac" from Back to the Future Part II.
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Fix for system option ssh-client source-interface
For the `verify_source_interface` the key `ifname` if required
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The function verify_interface_exists requires a reference to the ambient
config_dict rather than creating an instance. As access is required to
the 'interfaces' path, provide as attribute of class ConfigDict, so as
not to confuse path searches of script-specific config_dict instances.
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by TuneD
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* Use interface_exists() outside of verify()
* Use verify_interface_exists() in verify() to drop common error message
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Lower available CPU C states to a minimum if this option set. This will set
Kernel commandline options "intel_idle.max_cstate=0 processor.max_cstate=1".
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We will use _ as CLI level divider. The XML definition filename and also
the Python helper should match the CLI node.
Example:
set interfaces ethernet -> interfaces_ethernet.xml.in
set interfaces bond -> interfaces_bond.xml.in
set service dhcp-server -> service_dhcp-server-xml.in
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