Update default path-finding weight ratios (#1796)

* Update default path-finding weight ratios * The two months window for channel age was too small for today's network * CLTV is less of an issue nowadays: there are fewer stuck payments and we're encouraging nodes to increase their CLTV because of the recent mempool congestions
ACINQ · May 12, 2021 · 340fd29 · 340fd29
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commit 340fd29
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Showing 2 changed files with 9 additions and 9 deletions.
diff --git a/eclair-core/src/main/resources/reference.conf b/eclair-core/src/main/resources/reference.conf
@@ -174,16 +174,16 @@ eclair {
     // the values below will be used to perform route searching
     path-finding {
       max-route-length = 6         // max route length for the 'first pass', if none is found then a second pass is made with no limit
-      max-cltv = 1008             // max acceptable cltv expiry for the payment (1008 ~ 1 week)
+      max-cltv = 1008              // max acceptable cltv expiry for the payment (1008 ~ 1 week)
       fee-threshold-sat = 21       // if fee is below this value we skip the max-fee-pct check
       max-fee-pct = 0.03           // route will be discarded if fee is above this value (in percentage relative to the total payment amount); doesn't apply if fee < fee-threshold-sat
 
       // channel 'weight' is computed with the following formula: channelFee * (cltvDelta * ratio-cltv + channelAge * ratio-channel-age + channelCapacity * ratio-channel-capacity)
       // the following parameters can be used to ask the router to use heuristics to find i.e: 'cltv-optimized' routes, **the sum of the three ratios must be > 0 and <= 1**
-      heuristics-enable = true     // if true uses heuristics for path-finding
-      ratio-cltv = 0.15            // when computing the weight for a channel, consider its CLTV delta in this proportion
-      ratio-channel-age = 0.35     // when computing the weight for a channel, consider its AGE in this proportion
-      ratio-channel-capacity = 0.5 // when computing the weight for a channel, consider its CAPACITY in this proportion
+      heuristics-enable = true      // if true uses heuristics for path-finding
+      ratio-cltv = 0.05             // when computing the weight for a channel, consider its CLTV delta in this proportion
+      ratio-channel-age = 0.4       // when computing the weight for a channel, consider its AGE in this proportion
+      ratio-channel-capacity = 0.55 // when computing the weight for a channel, consider its CAPACITY in this proportion
 
       mpp {
         min-amount-satoshis = 15000 // minimum amount sent via partial HTLCs

diff --git a/eclair-core/src/main/scala/fr/acinq/eclair/router/Graph.scala b/eclair-core/src/main/scala/fr/acinq/eclair/router/Graph.scala
@@ -274,9 +274,9 @@ object Graph {
       case Some(wr) =>
         import RoutingHeuristics._
 
-        // Every edge is weighted by funding block height where older blocks add less weight, the window considered is 2 months.
+        // Every edge is weighted by funding block height where older blocks add less weight. The window considered is 1 year.
         val channelBlockHeight = ShortChannelId.coordinates(edge.desc.shortChannelId).blockHeight
-        val ageFactor = normalize(channelBlockHeight, min = currentBlockHeight - BLOCK_TIME_TWO_MONTHS, max = currentBlockHeight)
+        val ageFactor = normalize(channelBlockHeight, min = currentBlockHeight - BLOCK_TIME_ONE_YEAR, max = currentBlockHeight)
 
         // Every edge is weighted by channel capacity, larger channels add less weight
         val edgeMaxCapacity = edge.capacity.toMilliSatoshi
@@ -336,8 +336,8 @@ object Graph {
 
   object RoutingHeuristics {
 
-    // Number of blocks in two months
-    val BLOCK_TIME_TWO_MONTHS = 8640
+    // Number of blocks in one year
+    val BLOCK_TIME_ONE_YEAR = 365 * 24 * 6
 
     // Low/High bound for channel capacity
     val CAPACITY_CHANNEL_LOW = MilliBtc(1).toMilliSatoshi