igb_update_itr(9)

📦 version 7.3.1, in nixpkgs unstable

💖 igb_update_itr(9) — the glow-up 💖

okay so this is the manual page for igb_update_itr(9), from the kernel API manual, and honestly it's giving "quiet little function that does a LOT". stay with me bestie 🫶

✨ NAME ✨

igb_update_itr — update the dynamic ITR value based on statistics

like. it literally recalculates your interrupt throttling from the receipts of what your traffic actually did. main character energy fr 💅

✨ SYNOPSIS ✨

void igb_update_itr (struct igb_q_vector *q_vector , struct
       igb_ring_container *ring_container );

🌸 ARGUMENTS 🌸

  • q_vector — pointer to q_vector. yes. that's the whole description. she's a pointer to the q_vector bestie, that's the tea ☕
  • ring_container — ring info to update the itr for. this is the one doing the actual work here, lowkey the icon of the page 👑

💫 DESCRIPTION 💫

so what she does: stores a new ITR value based on the packets and byte counts from the last interrupt. past-tense interrupt. she's looking at what already happened and going "okay, adjusting" 🦋

the advantage of computing it per interrupt is faster updates and a more accurate ITR for the current traffic pattern. like, she's not working off stale vibes — she's reading the room in real time ✨

the constants in this function were computed based on theoretical maximum wire speed, and the thresholds were set based on testing data and on trying to minimize response time while increasing bulk throughput. so it's math + lab data + a genuine attempt to be fast AND ship a lot of bytes. both. she can do both 💜

this whole functionality is controlled by ethtool's coalescing settings — so if you're wondering "who's driving this thing", it's ethtool. she's the passenger princess steering from the back seat 🎀

🔥 NOTE 🔥

these calculations are only valid when operating in a single-queue environment. no cap, if you're out here multi-queue, this math is not valid for you. do not pass go. do not collect ITR values 🙈

💀 SEE ALSO 💀

first up, the kernel file to go read with your own two eyes:

  • ./drivers/net/ethernet/intel/igb/igb_main.c

and now. the entire igb cinematic universe. every single one of them, in order, no skips, no shuffle 👑🌈

and that's the page!! 🎀 she's short, she's sweet, she's doing interrupt moderation math at wire speed and she's not sorry about it. mwah 💋

sign-off besties: this page lives in ./drivers/net/ethernet/intel/igb and the version is dated October 2026 — so like, future girlie behavior, we love to see it ⭐🦋💜

📦 where this page comes from