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eth: stabilize peer selection for transaction broadcast

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When maxPeers was just above some perfect square, and a few peers
dropped for some reason, we changed the peer selection function.
When new peers were acquired, we changed again.
This patch stabilizes the selection function under normal operating
conditions close to saturation.

Signed-off-by: Csaba Kiraly <csaba.kiraly@gmail.com>
This commit is contained in:
Csaba Kiraly 2025-04-25 00:53:12 +02:00 committed by Felix Lange
parent 27d4a10185
commit c022c3f8ab
1 changed files with 7 additions and 4 deletions
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11
eth/handler.go
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@ -482,10 +482,13 @@ func (h *handler) BroadcastTransactions(txs types.Transactions) {
annos = make(map[*ethPeer][]common.Hash) // Set peer->hash to announce annos = make(map[*ethPeer][]common.Hash) // Set peer->hash to announce
) )
// Broadcast transactions to a batch of peers not knowing about it // Broadcast transactions to a batch of peers not knowing about it
direct := big.NewInt(int64(math.Sqrt(float64(h.peers.len())))) // Approximate number of peers to broadcast to sqrtPeers := int64(math.Sqrt(float64(h.peers.len()))) // Approximate number of peers to broadcast to
if direct.BitLen() == 0 {
direct = big.NewInt(1) // If maxPeers is just above some perfect square, we need to stabilize
} // the number to avoid frequent changes when a few peers drop.
maxDirect := int64(math.Sqrt(float64(h.maxPeers)) - 0.5)
direct := big.NewInt(max(min(sqrtPeers, maxDirect), 1))
total := new(big.Int).Exp(direct, big.NewInt(2), nil) // Stabilise total peer count a bit based on sqrt peers total := new(big.Int).Exp(direct, big.NewInt(2), nil) // Stabilise total peer count a bit based on sqrt peers
var ( var (