User Manual

ManualsBrandsAsus ManualsServer AccessoriesPEM-FDR

Driver FeaturesRev 2.1-1.0.6

Mellanox Technologies

Usage:

The application calls the

ibv_reg_mr API which turns on the IBV_ACCESS_ALLOCATE_MR bit and

sets the input address to NULL. Upon success, the address field of the struct

ibv_mr will hold the

address to the allocated memory block. This block will be freed implicitly when the

ibv_dereg_mr() is called.

The following are environment variables that can be used to control error cases / contiguity:

4.10 Shared Memory Region

Shared Memory Region is only applicable to the mlx4 driver.

Shared Memory Region (MR) enables sharing MR among applications by implementing the

"Register Shared MR" verb which is part of the IB spec.

Sharing MR involves the following steps:

Step 1. Request to create a shared MR

The application sends a request via the

ibv_reg_mr API to create a shared MR. The application

supplies the allowed sharing access to that MR. If the MR was created successfully, a unique MR

ID is returned as part of the struct

ibv_mr which can be used by other applications to register with

that MR.

ALL Try huge fallback to contiguous if failed fallback to ANON

small pages.

1. Values are NOT case sensitive.

Table 4 - Parameters Used to Control Error Cases / Contiguity

Parameters Description

MLX_MR_ALLOC_TYPE

Configures the allocator type.

• ALL (Default) - Uses all possible allocator and selects most effi-

cient allocator.

• ANON - Enables the usage of anonymous pages and disables the

allocator

• CONTIG - Forces the usage of the contiguous pages allocator. If

contiguous pages are not available the allocation fails

MLX_MR_MAX_LOG2_CONTIG_BS

IZE

Sets the maximum contiguous block size order.

• Values: 12-23

• Default: 23

MLX_MR_MIN_LOG2_CONTIG_BS

IZE

Sets the minimum contiguous block size order.

• Values: 12-23

• Default: 12

Table 3 - Buffer Values

Possible Value

Description