tcp_lp_rtt_sample(9)

💅 tcp_lp_rtt_sample(9)

okay so welcome to the Kernel API Manual bestie, today we're looking at tcp_lp_rtt_sample and honestly? she's a little mysterious. ✨

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🎀 NAME 🎀

tcp_lp_rtt_sample — and that's it. no description. no explanation. just vibes. (the original page really does leave this blank, so we're matching energy 🫶)

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🌸 SYNOPSIS 🌸

void tcp_lp_rtt_sample (struct sock *sk , u32 rtt );

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🦋 ARGUMENTS 🦋

• sk — the socket you're adding a rtt sample to. this is the one doing the actual work, main character energy fr 💅
• rtt — the round trip time… which is ignored! 😭 like why are you even here bestie. she's invited to the party and then completely ignored ngl.

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⭐ DESCRIPTION ⭐

so this is the implementation of rtt_sample. here's the whole little routine, step by step:

1. calc OWD (one-way delay, iykyk) ✨
2. record the min/max OWD — gotta keep track of the range 🌈
3. calc the smoothed OWD (SOWD) — the glow-up version of your OWD 💖

and the tea: most ideas come straight from the original TCP-LP implementation. no cap, that's where the inspo lives 👑

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🔥 SEE ALSO 🔥

kernel file ./net/ipv4/tcp_lp.c is where the whole squad hangs out, and here's everyone:

• enum tcp_lp_state(9)
• struct lp(9)
• tcp_lp_init(9)
• tcp_lp_cong_avoid(9)
• tcp_lp_remote_hz_estimator(9)
• tcp_lp_owd_calculator(9)
• tcp_lp_pkts_acked(9)

go read their pages too, they ate and left no crumbs 💀🧚

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aaaand that's the whole page bestie 🫶 this little icon lives in ./net/ipv4, dated October 2026, and if you ever need to find her again just yell tcp_lp_rtt_sample(9) into the void and she'll appear 💜🎀✨