⚡ Bolt: Batch producer wakeups in NAPI poll - #30
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Batches `nata_wake_tx_peer` outside the spinlock and the while loop in `nata_poll`. This prevents waking up the peer's transmit queue on every dequeued packet, reducing lock contention overhead. Co-authored-by: maxugly <64644401+maxugly@users.noreply.github.com>
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💡 What
Batches
nata_wake_tx_peercalls outside thewhileloop andpriv->lockspinlock innata_poll.🎯 Why
Calling
nata_wake_tx_peer(which indirectly callsnetif_wake_queue) inside a spinlock for every single dequeued packet is highly inefficient. It increases the time the spinlock is held and executes unnecessary redundant wakeups, leading to high contention in the hotpath.📊 Impact
Reduces CPU cycles spent in
spin_unlock/spin_lockandnetif_wake_queue, significantly minimizing lock contention overhead and theoretically increasing networking throughput, especially during high-packet-rate scenarios (flood tests).🔬 Measurement
Verified via static analysis and code review. Standard tests like
nata-bench-once.shwould show higher TCP throughput due to reduced CPU overhead if a kernel test environment is available.PR created automatically by Jules for task 5186029405788169018 started by @maxugly