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-rw-r--r--src/bench/peer_eviction.cpp156
1 files changed, 156 insertions, 0 deletions
diff --git a/src/bench/peer_eviction.cpp b/src/bench/peer_eviction.cpp
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+// Copyright (c) 2021 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include <bench/bench.h>
+#include <net.h>
+#include <netaddress.h>
+#include <random.h>
+#include <test/util/net.h>
+#include <test/util/setup_common.h>
+
+#include <algorithm>
+#include <functional>
+#include <vector>
+
+static void EvictionProtectionCommon(
+ benchmark::Bench& bench,
+ int num_candidates,
+ std::function<void(NodeEvictionCandidate&)> candidate_setup_fn)
+{
+ using Candidates = std::vector<NodeEvictionCandidate>;
+ FastRandomContext random_context{true};
+ bench.warmup(100).epochIterations(1100);
+
+ Candidates candidates{GetRandomNodeEvictionCandidates(num_candidates, random_context)};
+ for (auto& c : candidates) {
+ candidate_setup_fn(c);
+ }
+
+ std::vector<Candidates> copies{bench.epochs() * bench.epochIterations(), candidates};
+ size_t i{0};
+ bench.run([&] {
+ ProtectEvictionCandidatesByRatio(copies.at(i));
+ ++i;
+ });
+}
+
+/* Benchmarks */
+
+static void EvictionProtection0Networks250Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 250 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_network = NET_IPV4;
+ });
+}
+
+static void EvictionProtection1Networks250Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 250 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_is_local = false;
+ if (c.id >= 130 && c.id < 240) { // 110 Tor
+ c.m_network = NET_ONION;
+ } else {
+ c.m_network = NET_IPV4;
+ }
+ });
+}
+
+static void EvictionProtection2Networks250Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 250 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_is_local = false;
+ if (c.id >= 90 && c.id < 160) { // 70 Tor
+ c.m_network = NET_ONION;
+ } else if (c.id >= 170 && c.id < 250) { // 80 I2P
+ c.m_network = NET_I2P;
+ } else {
+ c.m_network = NET_IPV4;
+ }
+ });
+}
+
+static void EvictionProtection3Networks050Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 50 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_is_local = (c.id == 28 || c.id == 47); // 2 localhost
+ if (c.id >= 30 && c.id < 47) { // 17 I2P
+ c.m_network = NET_I2P;
+ } else if (c.id >= 24 && c.id < 28) { // 4 Tor
+ c.m_network = NET_ONION;
+ } else {
+ c.m_network = NET_IPV4;
+ }
+ });
+}
+
+static void EvictionProtection3Networks100Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 100 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_is_local = (c.id >= 55 && c.id < 60); // 5 localhost
+ if (c.id >= 70 && c.id < 80) { // 10 I2P
+ c.m_network = NET_I2P;
+ } else if (c.id >= 80 && c.id < 96) { // 16 Tor
+ c.m_network = NET_ONION;
+ } else {
+ c.m_network = NET_IPV4;
+ }
+ });
+}
+
+static void EvictionProtection3Networks250Candidates(benchmark::Bench& bench)
+{
+ EvictionProtectionCommon(
+ bench,
+ 250 /* num_candidates */,
+ [](NodeEvictionCandidate& c) {
+ c.nTimeConnected = c.id;
+ c.m_is_local = (c.id >= 140 && c.id < 160); // 20 localhost
+ if (c.id >= 170 && c.id < 180) { // 10 I2P
+ c.m_network = NET_I2P;
+ } else if (c.id >= 190 && c.id < 240) { // 50 Tor
+ c.m_network = NET_ONION;
+ } else {
+ c.m_network = NET_IPV4;
+ }
+ });
+}
+
+// Candidate numbers used for the benchmarks:
+// - 50 candidates simulates a possible use of -maxconnections
+// - 100 candidates approximates an average node with default settings
+// - 250 candidates is the number of peers reported by operators of busy nodes
+
+// No disadvantaged networks, with 250 eviction candidates.
+BENCHMARK(EvictionProtection0Networks250Candidates);
+
+// 1 disadvantaged network (Tor) with 250 eviction candidates.
+BENCHMARK(EvictionProtection1Networks250Candidates);
+
+// 2 disadvantaged networks (I2P, Tor) with 250 eviction candidates.
+BENCHMARK(EvictionProtection2Networks250Candidates);
+
+// 3 disadvantaged networks (I2P/localhost/Tor) with 50/100/250 eviction candidates.
+BENCHMARK(EvictionProtection3Networks050Candidates);
+BENCHMARK(EvictionProtection3Networks100Candidates);
+BENCHMARK(EvictionProtection3Networks250Candidates);