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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 f690e4984d
commit 9b7ed2fd8b
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_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_MIN_EPOCH 10 // minutes
#define CRYPTONOTE_DANDELIONPP_EPOCH_RANGE 30 // seconds #define CRYPTONOTE_DANDELIONPP_EPOCH_RANGE 30 // seconds
#define CRYPTONOTE_DANDELIONPP_FLUSH_AVERAGE 5 // seconds average for poisson distributed fluff flush #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 // see src/cryptonote_protocol/levin_notify.cpp
#define CRYPTONOTE_NOISE_MIN_EPOCH 5 // minutes #define CRYPTONOTE_NOISE_MIN_EPOCH 5 // minutes

4
src/cryptonote_core/tx_pool.cpp
View file

@ -75,11 +75,11 @@ namespace cryptonote
not ideal since a blackhole is more likely to reveal earlier nodes in not ideal since a blackhole is more likely to reveal earlier nodes in
the chain. 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 testrun from a recent Intel laptop took ~80ms to
receive+parse+proces+send transaction. At least 50ms will be added 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 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}; constexpr const std::chrono::seconds dandelionpp_embargo_average{CRYPTONOTE_DANDELIONPP_EMBARGO_AVERAGE};
//TODO: constants such as these should at least be in the header, //TODO: constants such as these should at least be in the header,