---
name: "nvme_cmb_size"
section: "2"
platform: "linux"
package: "libnvme-dev"
version: "1.13-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/nvme_cmb_size"
---

# nvme\_cmb\_size(2)

Calculate size of the controller memory buffer

## NAME

nvme\_cmb\_size - Calculate size of the controller memory buffer

## SYNOPSIS

**\_\_u64 nvme\_cmb\_size** **(\_\_u32 cmbsz** *);*

## ARGUMENTS

- cmbsz

  Value from controller register NVME\_REG\_CMBSZ

## RETURN

size of controller memory buffer in bytes