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⚡ Bolt: Batch NAPI producer wakeups outside spinlock - #44

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bolt-optimize-napi-batch-wakeups-3472510293251686455
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⚡ Bolt: Batch NAPI producer wakeups outside spinlock#44
maxugly wants to merge 1 commit into
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bolt-optimize-napi-batch-wakeups-3472510293251686455

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@maxugly

@maxugly maxugly commented Aug 5, 2026

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💡 What: Batches producer wakeups (nata_wake_tx_peer) outside of the spin_lock block in the nata_poll NAPI polling loop.
🎯 Why: In high-throughput network scenarios, waking the producer inside the while (work < budget) loop means taking the spinlock, releasing it, waking the peer, and re-taking the lock up to 64 times per NAPI poll. This causes unnecessary lock contention and degrades performance. By tracking if any packets were dequeued and performing a single batched wakeup outside the lock, we optimize the NAPI hotpath.
📊 Impact: Reduces lock contention and CPU overhead during heavy packet reception by batching peer netdev queue wakeups.
🔬 Measurement: Code review (run sudo ./scripts/nata-bench-once.sh in an environment with kernel headers, observe reduced CPU cycles per packet in perf).


PR created automatically by Jules for task 3472510293251686455 started by @maxugly

Co-authored-by: maxugly <64644401+maxugly@users.noreply.github.com>
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