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Change Dandelion++ fluff probability to 20%, and embargo timeout to 39s

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A 20% fluff probability increases the precision of a spy connected to
every node by 10% on average, compared to a network using 0% fluff
probability. The current value (10% fluff) should increase precision by
~5% compared to baseline.

This decreases the expected stem length from 10 to 5. The embargo
timeout was therefore lowered to 39s; the fifth node in a stem is
expected to have a 90% chance of being the first to timeout, which is
the same probability we currently have with an expected stem length of
10 nodes.
This commit is contained in:
Lee Clagett 2020-11-17 21:45:37 -05:00
parent 83f1d863bd
commit b10878f108
2 changed files with 4 additions and 4 deletions
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4
src/cryptonote_config.h
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@ -102,11 +102,11 @@
#define CRYPTONOTE_DANDELIONPP_STEMS 2 // number of outgoing stem connections per epoch
#define CRYPTONOTE_DANDELIONPP_FLUFF_PROBABILITY 10 // out of 100
#define CRYPTONOTE_DANDELIONPP_FLUFF_PROBABILITY 20 // out of 100
#define CRYPTONOTE_DANDELIONPP_MIN_EPOCH 10 // minutes
#define CRYPTONOTE_DANDELIONPP_EPOCH_RANGE 30 // seconds
#define CRYPTONOTE_DANDELIONPP_FLUSH_AVERAGE 5 // seconds average for poisson distributed fluff flush
#define CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE 173 // seconds (see tx_pool.cpp for more info)
#define CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE 39 // seconds (see tx_pool.cpp for more info)
// see src/cryptonote_protocol/levin_notify.cpp
#define CRYPTONOTE_NOISE_MIN_EPOCH 5 // minutes

4
src/cryptonote_core/tx_pool.cpp
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@ -75,11 +75,11 @@ namespace cryptonote
not ideal since a blackhole is more likely to reveal earlier nodes in
the chain.
This value was calculated with k=10, ep=0.10, and hop = 175 ms. A
This value was calculated with k=5, ep=0.10, and hop = 175 ms. A
testrun from a recent Intel laptop took ~80ms to
receive+parse+proces+send transaction. At least 50ms will be added to
the latency if crossing an ocean. So 175ms is the fudge factor for
a single hop with 173s being the embargo timer. */
a single hop with 39s being the embargo timer. */
constexpr const std::chrono::seconds dandelionpp_embargo_average{CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE};
//TODO: constants such as these should at least be in the header,