nvme_id_psd - Man Page

Power Management data structure

Synopsis

struct nvme_id_psd {
   __le16 mp;
   __u8 rsvd2;
   __u8 flags;
   __le32 enlat;
   __le32 exlat;
   __u8 rrt;
   __u8 rrl;
   __u8 rwt;
   __u8 rwl;
   __le16 idlp;
   __u8 ips;
   __u8 rsvd19;
   __le16 actp;
   __u8 apws;
   __u8 rsvd23[9];
};

Members

mp

Maximum Power indicates the sustained maximum power consumed by the NVM subsystem in this power state. The power in Watts is equal to the value in this field multiplied by the scale specified in the Max Power Scale bit (see enum nvme_psd_flags). A value of 0 indicates Maximum Power is not reported.

rsvd2

Reserved

flags

Additional decoding flags, see enum nvme_psd_flags.

enlat

Entry Latency indicates the maximum latency in microseconds associated with entering this power state. A value of 0 indicates Entry Latency is not reported.

exlat

Exit Latency indicates the maximum latency in microseconds associated with exiting this power state. A value of 0 indicates Exit Latency is not reported.

rrt

Relative Read Throughput indicates the read throughput rank associated with this power state relative to others. The value in this is less than the number of supported power states.

rrl

Relative Read Latency indicates the read latency rank associated with this power state relative to others. The value in this field is less than the number of supported power states.

rwt

Relative Write Throughput indicates write throughput rank associated with this power state relative to others. The value in this field is less than the number of supported power states

rwl

Relative Write Latency indicates the write latency rank associated with this power state relative to others. The value in this field is less than the number of supported power states

idlp

Idle Power indicates the typical power consumed by the NVM subsystem over 30 seconds in this power state when idle.

ips

Idle Power Scale indicates the scale for struct nvme_id_psd.idlp, see enum nvme_psd_ps for decoding this field.

rsvd19

Reserved

actp

Active Power indicates the largest average power consumed by the NVM subsystem over a 10 second period in this power state with the workload indicated in the Active Power Workload field.

apws

Bits 7-6: Active Power Scale(APS) indicates the scale for the struct nvme_id_psd.actp, see enum nvme_psd_ps for decoding this value. Bits 2-0: Active Power Workload(APW) indicates the workload used to calculate maximum power for this power state. See enum nvme_psd_workload for decoding this field.

rsvd23

Reserved

Info

struct nvme_id_psd August 2022 API Manual