RFC: Hiding per-CPU kernel output behind bootverbose

[Julian Elischer]

On 20/4/18 4:48 am, Steven Hartland wrote:
> Sounds good to me, I think we could actually benefit from even quieter
> modes if I’m honest.
>
> On Thu, 19 Apr 2018 at 21:09, Colin Percival <cperciva at tarsnap.com> wrote:
>
>> On large systems (e.g., EC2's x1e.32xlarge instance type, with 128 vCPUs)
>> the boot time console output contains a large number of lines of the forms
>>
>> SMP: AP CPU #N Launched!
>> cpuN: <ACPI CPU> on acpi0
>> estN: <Enhanced SpeedStep Frequency Control> on cpuN
>>
>> Having 128 almost-identical lines of output doesn't seem very useful, and
>> it actually has a nontrivial impact on the time spent booting.
>>
>> Does anyone mind if I hide these by default, having them only show up if
>> boot verbosity is requested?

make them single line and just type a CR at the end so they cycle 
through on the same line.
or "previous line repeated N times  with only 3 characters different"


>> --
>> Colin Percival
>> Security Officer Emeritus, FreeBSD | The power to serve
>> Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
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