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net_processing: Boost inv trickle rate

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If transactions are being added to the mempool at a rate faster than 7tx/s
(INVENTORY_BROADCAST_PER_SECOND) then peers' inventory_to_send queue can
become relatively large. If this happens, increase the number of txids
we include in an INV message (normally capped at 35) by 5 for each 1000
txids in the queue.

This will tend to clear a temporary excess out reasonably quickly; an
excess of 4000 invs to send will be cleared down to 1000 in about 30
minutes, while an excess of 20000 invs would be cleared down to 1000 in
about 60 minutes.

Github-Pull: #27610
Rebased-From: 5b3406094f2679dfb3763de4414257268565b943
This commit is contained in:
Anthony Towns 2023-05-08 17:14:53 +10:00 committed by fanquake
parent a9a861af2b
commit 128da6e41f
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GPG Key ID: 2EEB9F5CC09526C1
1 changed files with 3 additions and 1 deletions
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4
src/net_processing.cpp
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@ -5594,7 +5594,9 @@ bool PeerManagerImpl::SendMessages(CNode* pto)
// especially since we have many peers and some will draw much shorter delays.
unsigned int nRelayedTransactions = 0;
LOCK(tx_relay->m_bloom_filter_mutex);
while (!vInvTx.empty() && nRelayedTransactions < INVENTORY_BROADCAST_MAX) {
size_t broadcast_max{INVENTORY_BROADCAST_MAX + (tx_relay->m_tx_inventory_to_send.size()/1000)*5};
broadcast_max = std::min<size_t>(1000, broadcast_max);
while (!vInvTx.empty() && nRelayedTransactions < broadcast_max) {
// Fetch the top element from the heap
std::pop_heap(vInvTx.begin(), vInvTx.end(), compareInvMempoolOrder);
std::set<uint256>::iterator it = vInvTx.back();