---
name: "nvme_cmb_size-libnvme3"
section: "2"
platform: "linux"
package: "nvme-cli"
version: "3.2-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/nvme_cmb_size-libnvme3"
---

# nvme\_cmb\_size-libnvme3(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