Re: [PATCH v3 0/5] add persistent huge zero folio support

[Pankaj Raghav (Samsung)]

> > Sorry, RFC v2 I think. It got a bit confusing with series names/versions.
> 
> Well, my worry is that 2M can be a high tax for smaller machines.
> Compile-time might be cleaner, but it has downsides.
> 
> It is also not clear if these users actually need physical HZP or virtual
> is enough. Virtual is cheap.

We do need physical as the main usecase was for block IO where we will
be DMAing. The main reason I was seeing an improvement in perf was we
were sending bigger chunks of memory in a single bio_vec instead of
using multiple bio_vec.

--
Pankaj