params: rename elastic multiplier to gastarget percentage(#1143)

Author: libotony

consensus/upgrade/galactica/galactica.go

@@ -24,7 +24,7 @@ func CalcBaseFee(parent *block.Header, forkConfig *thor.ForkConfig) *big.Int {
 	}
 
 	var (
-		parentGasTarget          = parent.GasLimit() * thor.ElasticityMultiplierNum / thor.ElasticityMultiplierDen
+		parentGasTarget          = parent.GasLimit() * thor.GasTargetPercentage / 100
 		parentGasTargetBig       = new(big.Int).SetUint64(parentGasTarget)
 		baseFeeChangeDenominator = new(big.Int).SetUint64(thor.BaseFeeChangeDenominator)
 	)

consensus/upgrade/galactica/galactica_test.go

@@ -205,7 +205,7 @@ func TestBaseFeeLimits(t *testing.T) {
 		var parentID thor.Bytes32
 		binary.BigEndian.PutUint32(parentID[:], 5)
 		parentGasLimit := uint64(20000000)
-		parentGasUsed := parentGasLimit * thor.ElasticityMultiplierNum / thor.ElasticityMultiplierDen
+		parentGasUsed := parentGasLimit * thor.GasTargetPercentage / 100
 
 		parentBaseFee := big.NewInt(thor.InitialBaseFee * 10)
 		for range 100 {

thor/params.go

@@ -44,8 +44,7 @@ const (
 	SeederInterval     = 8640 // blocks between two seeder epochs.
 	CheckpointInterval = 180  // blocks between two bft checkpoints.
 
-	ElasticityMultiplierNum  = 3                  // numerator value to determines the target gas limit as a fraction of the maximum block gas limit
-	ElasticityMultiplierDen  = 4                  // denominator value to determines the target gas limit as a fraction of the maximum block gas limit
+	GasTargetPercentage      = 75                 // percentage of the block gas limit to determine the gas target
 	InitialBaseFee           = 10_000_000_000_000 // 10^13 wei, 0.00001 VTHO
 	BaseFeeChangeDenominator = 8                  // determines the percentage change in the base fee per block based on network utilization
 )