[mdlug] Linux Kernel 6.1

[Carl T. Miller]

I haven't compiled my own kernels for several years,
although I used to every time.  Thanks for mentioning
these new options, in case I need to use them in the
future.

c


On 12/17/22 08:34 AM, LAP wrote:
> To those of you, like me, who compiles his own kernel there
> are some interesting changes in the latest 6.1 release.  Usually --
> for me anyway -- a new kernel doesn't seem to differ much from
> the previous versions but not this time.
>
> Doing the usual "make oldconfig" the first noteworthy feature
> that appears is:
>
>   Multi-Gen LRU (LRU_GEN) [N/y/?] (NEW)
>
> Multi-Gen LRU is a new high-performance memory management
> implementation that is intended to replace the old one.
>
> But it is not enabled by default and so I enabled it.
>
> Next along was this:
>
>   NR_CPUS is set to an actual number of CPUs (FORCE_NR_CPUS) [N/y/?] (NEW)
>
> I had to do some checking and I found that the usual .config
> entry for NR_CPUS involves a range, with the default being 64:
>
> CONFIG_NR_CPUS_RANGE_BEGIN=2
> CONFIG_NR_CPUS_RANGE_END=512
> CONFIG_NR_CPUS_DEFAULT=64
>
> Supposedly, forcing the NR_CPUS to be a specific value will allow
> optimization of kernel routines.
>
> https://www.spinics.net/lists/kernel/msg4493525.html
>
> More optimization, in my assessment is always better and so I enabled
> this option as well.
>
> Ideally, every Linux user should at least build his own kernel.  The
> distros can only offer a generic, lowest-common-denominator type product.
>
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