Re: Limit on max_entries of CPU_ARRAY_MAP

[Alexei Starovoitov <alexei.starovoitov@xxxxxxxxx>]

On Mon, Jan 29, 2018 at 11:00:27AM -0800, Zvi Effron wrote:
> Would it make sense to increase that limit for 64-bit systems? All of
> the comments on why that limit exists that I saw mentioned that
> userspace wouldn't be able to access all of the elements if it were
> bigger. But on a 64-bit system, shouldn't userspace be able to access
> more than 4GB?

What is the _real_ use case for more than 4Gbyte maps?

So far I've seen only one such case that had use to map-in-map
as a workaround to grow the total map size to ~20Gbyte,
but it eventually it was scaled down because at such sizes
performance was bad.