Contiguous Pages improves performance by allocating user memory regions over physical contiguous pages. It enables a user application to ask low level drivers to allocate contiguous memory for it as part of ibv_reg_mr.
Contiguous Pages Environmental Variables
| Environmental Variables | Value |
|---|---|
MLX_QP_ALLOC_TYPE | CONTIG, PREFER_CONTIG |
MLX_CQ_ALLOC_TYPE | CONTIG, PREFER_CONTIG |
MLX_MR_MAX_LOG2_CONTIG_BSIZE | _MAX_LOG2_CONTIG_BLOCK_SIZE (23) |
MLX_MR_MIN_LOG2_CONTIG_BSIZE | _MIN_LOG2_CONTIG_BLOCK_SIZE (12) |
HUGE_CQ | |
qp_huge_key |
Contiguous Pages Experimental Verbs
- ibv_exp_reg_mr
- IBV_EXP_ACCESS_ALLOCATE_MR
- ibv_exp_rereg_mr
- IBV_EXP_ACCESS_ALLOCATE_MR
Contiguous Pages RDMA-Core Support
Contiguous memory in RDMA-Core is achieved using huge pages.
