iavf_update_itr(9)

💅 iavf_update_itr — bestie, it's an update

okay so real talk, this little guy lives in the Kernel API Manual (that's the iavf_update_itr(9) manual, section 9, iykyk 🧚). It's the glow-up function for your ITR value, and honestly? She eats. Let me walk you through it 🫶

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✨ NAME ✨

iavf_update_itr — update the dynamic ITR value based on statistics ⭐

Like, the whole point. She looks at the receipts (stats) and recalibrates. Obsessed 💅

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🌸 SYNOPSIS 🌸

void iavf_update_itr (struct iavf_q_vector *q_vector , struct
       iavf_ring_container *rc );

returns nothing, takes two pointers, no cap 🎀

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🦋 ARGUMENTS 🦋

• q_vector — structure containing interrupt and ring information. your main character struct, fr fr 👑
• rc — structure containing ring performance data. the vibes/stats side of things 💜

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🌈 DESCRIPTION 🌈

so what she does: she stores a new ITR value based on packets and byte counts during the last interrupt. periodt. 💀

The advantage of per interrupt computation is faster updates and more accurate ITR for the current traffic pattern — like, she recalculates every single time, which is way more responsive than some lazy batched thing. main character energy tbh ⭐

The constants in this function were computed based on theoretical maximum wire speed, and the thresholds were set based on testing data as well as attempting to minimize response time while increasing bulk throughput. like, actual math + actual lab testing + a genuine attempt to keep latency low while pushing more bulk through. she's doing both. she contains multitudes 🧚✨

ngl this is not magic, bestie — the numbers are hand-tuned from theoretical wire speed and test data, so don't go randomly changing constants and expecting slay 💅

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💖 SEE ALSO 💖

Kernel file ./drivers/net/ethernet/intel/iavf/iavf_txrx.c — yeah that's where she lives 🏠

and the entire friend group (go say hi, they all know each other): iavf_is_descriptor_done(9), iavf_unmap_and_free_tx_resource(9), iavf_clean_tx_ring(9), iavf_free_tx_resources(9), iavf_get_tx_pending(9), iavf_force_wb(9), iavf_detect_recover_hung(9), iavf_clean_tx_irq(9), iavf_enable_wb_on_itr(9), iavf_setup_tx_descriptors(9), iavf_clean_rx_ring(9), iavf_free_rx_resources(9), iavf_setup_rx_descriptors(9), iavf_release_rx_desc(9), iavf_receive_skb(9), iavf_alloc_rx_buffers(9), iavf_rx_csum(9), iavf_legacy_rx_csum(9), iavf_flex_rx_csum(9), iavf_legacy_rx_hash(9), iavf_flex_rx_hash(9), iavf_flex_rx_tstamp(9), iavf_process_skb_fields(9), iavf_cleanup_headers(9), iavf_add_rx_frag(9), iavf_build_skb(9), iavf_is_non_eop(9), iavf_extract_legacy_rx_fields(9), iavf_extract_flex_rx_fields(9), iavf_clean_rx_irq(9), iavf_update_enable_itr(9), iavf_napi_poll(9), iavf_tx_prepare_vlan_flags(9), iavf_tso(9), iavf_tx_enable_csum(9), iavf_create_tx_ctx(9), __iavf_chk_linearize(9), __iavf_maybe_stop_tx(9), iavf_tx_map(9), iavf_xmit_frame_ring(9), iavf_xmit_frame(9)

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🎀 and that's the whole page bestie, ily, go read the source 💖

sign-off szn: this cutie came out of ./drivers/net/ethernet/intel/iavf and the date on the tin is October 2026 🌸 — she's from the future, we don't ask questions 💀✨