Re: [RFC PATCH 3/3] mm/map_contig: Add mmap(MAP_CONTIG) support

On 10/16/2017 10:32 PM, Mike Kravetz wrote:

Agree.  I only wanted to point out the similarities.
But, it does make me wonder how much of a benefit hugetlb 1G pages would
make in the the RDMA performance comparison.  The table in the presentation
show a average speedup of something like 27% (or so) for contiguous allocation
which I assume are 2GB in size.  Certainly, using hugetlb is not the ideal
case, just wondering if it does help and how much.

Good point. If somebody cares about performance benefits of contiguous
memory wrt device access, they would probably want also the TLB
performance benefits of huge pages.