Contiguous Pages

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.

Last updated: June 26, 2026