[dpdk-dev] [PATCH v5 2/2] build: add meson options of max_memseg_lists

[Bruce Richardson]

On Thu, Oct 14, 2021 at 04:54:19AM +0800, Kefu Chai wrote:
> RTE_MAX_MEMSEG_LISTS = 128 is not enough for many-core machines, in our
> case, we need to increase it to 8192. so add an option so user can
> override it.
> 
> Signed-off-by: Kefu Chai <tchaikov at gmail.com>

This seems a very low-level option to be exposing to the user. Some
thoughts/questions:

- can you give some more detail on why you need such a massive number, 64
  times the default?
- what would be the impact of increasing the default to 8192? I assume this
  is only used in a few places in EAL, so would the memory footprint
  increase be large?
- rather than a single specified value, would an alternative be to make
  this be a computed value at config time, scaled by number of lcores (or
  number of numa nodes)?

Regards,
/Bruce