nvme\_cmb\_size(9) libnvme API manual nvme\_cmb\_size(9)

# [NAME](#NAME)

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

# [SYNOPSIS](#SYNOPSIS)

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

# [ARGUMENTS](#ARGUMENTS)

[cmbsz](#cmbsz)

Value from controller register NVME\_REG\_CMBSZ

# [RETURN](#RETURN)

size of controller memory buffer in bytes

nvme\_cmb\_size October 2026

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Document: nvme_cmb_size-libnvme3(2) from nvme-cli 3.2-r0 (Chainguard OS)
Source: https://github.com/linux-nvme/nvme-cli