tcp_lp_cong_avoid(9)

💅 tcp_lp_cong_avoid(9) — a little kernel moment

ok so first things first, bestie: this is a page from the Kernel API Manual (yes, that manual), and today's main character is tcp_lp_cong_avoid. it's giving very niche, very kernel-internals, very iykyk 💖

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✨ NAME ✨

tcp_lp_cong_avoid —

(and honestly? that's the whole name entry. no description. the man page said "she's mysterious" and left it at that 🙈)

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✨ SYNOPSIS ✨

void tcp_lp_cong_avoid (struct sock *sk , u32 ack , u32 acked );

like… three args, void return, no notes. she's clean 🧚

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🎀 ARGUMENTS 🎀

• sk — the socket we're trying to keep from getting all congested. the whole point of the function, lowkey ⭐
• ack — the current ack sequence number. the now-ness of the ack.
• acked — how many packets got ACKed. a little count, a little tally 🍓

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💜 DESCRIPTION 💜

ok so this is the implementation of cong_avoid. it'll only call newReno CA when it's away from inference — like, newReno only gets the aux cord when we're not in inference mode, periodt.

and per the TCP-LP paper, this whole situation gets handled in additive increasement — that's the paper's term, not mine, don't come for me 😭

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🌈 SEE ALSO 🌈

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

the whole TCP-LP friend group, honestly. go read the siblings, they all ate 🫶

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ngl this one is short but she's important — it's a real kernel congestion-avoidance callback, so be nice to her 💀

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ok literally that's the page!! sourced from ./net/ipv4, dated October 2026, and it's the tcp_lp_cong_avoid(9) moment. mwah 💋✨🎀 slay and read your kernel source, bestie 👑