STRUCT LP(9)

💅 struct lp(9) 💅

okay so bestie, welcome to the struct lp page from the Kernel API Manual — yes, that's the TCP-LP one, and yes it's lowkey iconic. sit down, grab a strawberry 🍓, and let's get into it.

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✨ NAME ✨

struct lp — literally the private struct for TCP-LP, that's it, that's the vibe 🦋

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🌸 SYNOPSIS 🌸

struct lp {
    u32 flag;
    u32 sowd;
    u32 owd_min;
    u32 owd_max;
    u32 owd_max_rsv;
    u32 remote_hz;
    u32 remote_ref_time;
    u32 local_ref_time;
    u32 last_drop;
    u32 inference;
 };

like, that's the whole shape of it, no cap 💖

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🎀 Members 🎀

• flag — the TCP-LP state flag. it's giving "current mood" but for the protocol ✨
• sowd — smoothed OWD << 3. yes the shift is part of it, keep it exactly, don't touch it 🙈
• owd_min — min OWD. the floor, the bare minimum, the lowkey smallest one 📉
• owd_max — max OWD. the ceiling, the main character of the upper bound 🔥
• owd_max_rsv — reserved max owd. it's reserved, so like, it's holding its spot 👑
• remote_hz — estimated remote HZ. an estimate, bestie, not a promise 👀
• remote_ref_time — remote reference time. the remote side's timestamp moment 🕐
• local_ref_time — local reference time. our own timestamp moment, matching energy 🫶
• last_drop — time for last active drop. when the last active drop happened, for the record 💀
• inference — current inference. the current inference, periodt 💅

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⭐ Description ⭐

so this is TCP-LP's private struct — private as in it's hers, not for everyone 🧚

the idea comes from the original TCP-LP implementation, where only the members that were actually found to be really useful were kept. like a closet cleanout but for kernel struct fields, and honestly? ate. 🌈

ngl, this is a "we only left the useful ones" situation, not a "we documented every historical field" situation — so don't go looking for extra members, they're not here 💖

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🔍 SEE ALSO 🔍

• Kernel file ./net/ipv4/tcp_lp.c
• enum tcp_lp_state(9)
• tcp_lp_init(9)
• tcp_lp_cong_avoid(9)
• tcp_lp_remote_hz_estimator(9)
• tcp_lp_owd_calculator(9)
• tcp_lp_rtt_sample(9)
• tcp_lp_pkts_acked(9)

like, go read those too, iykyk 📚✨

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aaaand that's the page, bestie 🫶 this one lives in ./net/ipv4 and it's dated October 2026 — struct lp(9), slay, bye 💜