Increase DPDK's virtual memory to more than 512 GiB

[Lucas <lucascrijns@gmail.com>]

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Hello,

I am creating an application where I want to cache packets in a ring for a
certain duration. To do so at high speed (100 Gb/s) for tens of seconds, I
would like to create a mempool with a size bigger than 500 GiB.
I know that in rte_config.h, we have this excerpt:
```
#define RTE_MAX_MEMSEG_LISTS 128
...
#define RTE_MAX_MEM_MB_PER_LIST 32768
```
4'194'304 MiB of addressable memory, which is more than enough. However,
there is a virtual memory limit on DPDK processes on x86_64, which appears
to be 512 GiB.
at https://doc.dpdk.org/guides/prog_guide/env_abstraction_layer.html it is
listed that RTE_MAX_MEM_MB controls that.
In the meson.build file in the config directory, we have:
```
if dpdk_conf.get('RTE_ARCH_64')
    dpdk_conf.set('RTE_MAX_MEM_MB', 524288)
else # for 32-bit we need smaller reserved memory areas
    dpdk_conf.set('RTE_MAX_MEM_MB', 2048)
endif
```
Changing this value does not seem to change the amount of virtual memory
that DPDK allocates. It appears that no headers or C-files actually
reference this value.
What would I need to change to allow more virtual memory than 512 GiB and
be able to allocate a mempool with a size bigger than that?

Thank you in advance for any pointers!

Kind regards,
Lucas Crijns

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