STRUCT PIE_PARAMS(9)

🌸 NAME 🌸

okay so this is struct pie_params from the kernel API manual — section 9, bestie, we're in the deep internals now 💅 — and it's literally just the struct that holds all the pie parameters. that's it. that's the whole vibe. it contains pie parameters. iconic of it honestly 🥧✨

✨ SYNOPSIS ✨

here's the whole thing, typed out exactly, no cap:

struct pie_params {
    psched_time_t target;
    u32 tupdate;
    u32 limit;
    u32 alpha;
    u32 beta;
    u8 ecn;
    u8 bytemode;
    u8 dq_rate_estimator;
 };

look at her. a whole little struct. main character energy fr fr 🫶

💅 Members 💅

okay so now the important part, the members, one by one, no skipping, i would never 🙈

• target — the target delay, measured in pschedtime. that's the number you're aiming for, the goal, the dream 🎀
• tupdate — the interval at which the drop probability gets recalculated 🔄
• limit — the total number of packets that can be in the queue. the cap. the ceiling. the "no more than this, bestie" ⭐
• alpha — a parameter that controls drop probability 🌸
• beta — another parameter that controls drop probability. her and alpha are a duo, iykyk 💜
• ecn — is ECN marking of packets enabled? yes/no, that's the whole question 👑
• bytemode — is the drop probability scaled based on pkt size? 👀
• dq_rate_estimator — is Little's law used for qdelay calculation? that's the literally-what-it-says field name and i respect the honesty 🔥

ngl, half of these are just "is this a thing, yes or no" flags, and honestly? slay. readable code is a flex 💀

🦋 SEE ALSO 🦋

go look at the kernel file ./include/net/pie.h and also these besties:

• struct pie_vars(9)
• struct pie_stats(9)
• struct pie_skb_cb(9)

and that's the page!! mwah 💖 this one lives in ./include/net, dated October 2026, and it's struct pie_params(9) — go read the other structs too, they're all in this together 🧚✨