libnvme(2)

✨ NAME ✨

struct nvme_nvmset_predictable_lat_log</p> — the Predictable Latency Mode — Deterministic Threshold Configuration Data struct, bestie 💖

okay so real talk, this is one of those pages from the libnvme API manual, and it's giving "here's the exact byte layout of a chunk of NVMe log data" energy. It's a C struct, it's packed, and every single field is doing its little job. Let's get into it 🎀

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🦋 SYNOPSIS 🦋

struct nvme_nvmset_predictable_lat_log {
    __u8 status;
    __u8 rsvd1;
    __le16 event_type;
    __u8 rsvd4[28];
    __le64 dtwin_rt;
    __le64 dtwin_wt;
    __le64 dtwin_tmax;
    __le64 ndwin_tmin_hi;
    __le64 ndwin_tmin_lo;
    __u8 rsvd72[56];
    __le64 dtwin_re;
    __le64 dtwin_we;
    __le64 dtwin_te;
    __u8 rsvd152[360];
};

no cap, that's the whole shape of it. Note the __le64 fields — those are little-endian 64-bit values, so mind your byte order when you're reading real hardware data, iykyk 🔥

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🫶 Members 🫶

• status — Status.
• rsvd1 — Reserved. don't touch her, she's just padding 💅
• event_type — Event Type.
• rsvd4 — Reserved. <28> bytes of absolutely minding its own business.
• dtwin_rt — DTWIN Reads Typical.
• dtwin_wt — DTWIN Writes Typical.
• dtwin_tmax — DTWIN Time Maximum.
• ndwin_tmin_hi — NDWIN Time Minimum High.
• ndwin_tmin_lo — NDWIN Time Minimum Low.
• rsvd72 — Reserved. <56> bytes of vibing in the void ✨
• dtwin_re — DTWIN Reads Estimate.
• dtwin_we — DTWIN Writes Estimate.
• dtwin_te — DTWIN Time Estimate.
• rsvd152 — Reserved. and <360> more bytes of the same, periodt.

lowkey the reserved fields are the main character here — they're most of the struct by volume 🙈 but fr fr, leave them exactly as they are, they're load-bearing for the layout.

so yeah. DTWIN = Deterministic Window, NDWIN = Non-Deterministic Window, and this struct is the Deterministic Threshold Configuration Data slice of the whole predictable-latency situation. iconic. obsessed. 💜

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slay, that's the whole page 🦋✨

this page is from the libnvme API manual, and the footer stamp says July 2026 — and the title it belongs to is struct nvme_nvmset_predictable_lat_log. tysm for reading, go read some more structs, ily 💖🎀