---
name: "nvme_power_meas_log-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_power_meas_log-libnvme3"
---

# nvme\_power\_meas\_log-libnvme3(2)

Power Measurement Log Page (Log Identifier 25h)

## NAME

struct nvme\_power\_meas\_log - Power Measurement Log Page (Log Identifier 25h)

## SYNOPSIS

struct nvme\_power\_meas\_log {\
     **\_\_u8 ver;**\
     **\_\_u8 pmgn;**\
     **\_\_le16 pma;**\
     **\_\_le32 sze;**\
     **\_\_le32 pmc;**\
     **\_\_le16 nphd;**\
     **\_\_le16 smtr;**\
     **struct nvme\_timestamp   smts;**\
     **\_\_le16 phds;**\
     **\_\_le16 phbs;**\
     **\_\_le16 nphds;**\
     **\_\_le16 vss;**\
     **\_\_le32 phdoc;**\
     **\_\_u8 rsvd36\[4\];**\
     **\_\_le32 aipwr;**\
     **\_\_le32 mipwr;**\
     **struct nvme\_timestamp   mipwrt;**\
     **\_\_u8 ipwrpe;**\
     **\_\_u8 rsvd57\[7\];**\
     **struct nvme\_power\_histogram\_desc descs\[\];**\
 };\

## Members

- ver

  Version. Shall be cleared to 0h.

- pmgn

  Power Measurement Generation Number. Incremented each time a Set Features command with Action = 1h (Start Power Measurements) is successfully completed. Rolls over from FFh to 0h.

- pma

  Power Measurement Attributes. See *enum nvme\_pma*.

- sze

  Size. Indicates the size of this log page in bytes.

- pmc

  Power Measurement Count. Number of interval power measurements collected. Does not wrap after FFFFFFFFh. Cleared to 0h when Start Power Measurements succeeds or if no measurement has occurred.

- nphd

  Number of Power Histogram Descriptors in this log page.

- smtr

  Stop Measurement Time Remaining. Time remaining in minutes until controller stops collecting interval power measurements. 0h means not specified.

- smts

  Stop Measurement Timestamp. Timestamp of when interval power measurements stopped being collected. See *struct nvme\_timestamp*.

- phds

  Power Histogram Descriptor Size. Size in bytes of each descriptor.

- phbs

  Power Histogram Bin Size. Size in milliwatts of each bin. Shall be set to 250 milliwatts.

- nphds

  Number of Power Histogram Descriptors Supported. Maximum number of descriptors that can be reported. If 0h, NPHD shall be cleared to 0h and no descriptors are reported.

- vss

  Vendor Specific Size. Size in bytes of the Vendor Specific field.

- phdoc

  Power Histogram Descriptor Overflow Count. Number of interval power measurements greater than the maximum power indicated by the last Power Histogram Descriptor. Does not wrap after FFFFFFFFh.

- rsvd36

  Reserved.

- aipwr

  Average Interval Power. Bits 31:18 are reserved. Bits 17:16 contain the Power Scale (PWRS); see *enum nvme\_psd\_ps*. Bits 15:0 contain the Power Value (PWRV).

- mipwr

  Maximum Interval Power. Bits 31:18 are reserved. Bits 17:16 contain the Power Scale (PWRS); see *enum nvme\_psd\_ps*. Bits 15:0 contain the Power Value (PWRV).

- mipwrt

  Maximum Interval Power Timestamp. Timestamp of when the maximum interval power was collected. See *struct nvme\_timestamp*.

- ipwrpe

  Interval Power Percent Error. Maximum percent error (0-100%). Values 101-254 reserved. 255 indicates not reported.

- rsvd57

  Reserved.

- descs

  Power Histogram Descriptors (*struct nvme\_power\_histogram\_desc*).