ath5k_hw_upd...tx_triglevel(9)

📦 version 7.3.1, in nixpkgs unstable

🎀 ath5k_hw_upd...tx_triglevel(9) 🎀

okay bestie, so this is a page from the Kernel API Manual (yes, the truncated-looking name ath5k_hw_upd...tx_triglevel(9) is literally how it's written, don't come for me 💅). It's about one tiny little function that fiddles with your tx trigger level, and honestly? It's giving "small function, big consequences." Let's get into it ✨

✨ NAME ✨

ath5k_hw_update_tx_triglevel — update tx trigger level 🫶

🌸 SYNOPSIS 🌸

int ath5k_hw_update_tx_triglevel (struct ath5k_hw *ah , bool increase );

💖 ARGUMENTS 💖

  • ah — the struct ath5k_hw, aka your hardware struct, the main character here 👑
  • increase — a flag that forces the trigger level to go up ⬆️

🦋 DESCRIPTION 🦋

so what does this function actually do? It increases/decreases the tx trigger level for the tx fifo buffer — which is also known as the FIFO threshold, iykyk. That threshold is the thing that tells the PCU when it's time to flush the buffer and transmit its data 📤

Here's the tea on tuning it:

  • Lowering it = small frames go out more quickly 🏃‍♀️💨
  • But lowering it can lead to tx underruns 😭
  • Raising it a lot can result in other problems 🙈

Right now, the code starts with the lowest possible value, which is 64Bytes, and if we get a tx underrun we bump it up using the increase flag. It returns -EIO if we've reached the maximum/minimum 📉

XXX: Link this with tx DMA size ? XXX2: Use it to save interrupts ? — these are the dev's open questions, left in as-is, no cap 💀

🧚 SEE ALSO 🧚

Kernel file ./drivers/net/wireless/ath/ath5k/dma.c — DMA and interrupt masking functions(9) 🌈, plus all these iconic siblings:

and that's the whole page, bestie! this cutie lives in ./drivers/net/wireless/ath/ath5k, it's dated October 2026, and it's filed under ath5k_hw_upd...tx_triglevel(9). go forth and tune those thresholds responsibly 💜🎀✨

📦 where this page comes from