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Remove PackingEfficiency consideration from base fee in an upgrade

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Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>
This commit is contained in:
Jakub Sztandera 2020-09-10 12:22:49 +02:00 committed by Aayush Rajasekaran
parent db6bd890d9
commit fd714cbceb
2 changed files with 13 additions and 7 deletions
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18
chain/store/basefee.go
View File

@ -11,14 +11,20 @@ import (
"golang.org/x/xerrors"
)
func computeNextBaseFee(baseFee types.BigInt, gasLimitUsed int64, noOfBlocks int) types.BigInt {
// deta := 1/PackingEfficiency * gasLimitUsed/noOfBlocks - build.BlockGasTarget
// change := baseFee * deta / BlockGasTarget / BaseFeeMaxChangeDenom
func computeNextBaseFee(baseFee types.BigInt, gasLimitUsed int64, noOfBlocks int, epoch abi.ChainEpoch) types.BigInt {
// deta := gasLimitUsed/noOfBlocks - build.BlockGasTarget
// change := baseFee * deta / BlockGasTarget
// nextBaseFee = baseFee + change
// nextBaseFee = max(nextBaseFee, build.MinimumBaseFee)
delta := build.PackingEfficiencyDenom * gasLimitUsed / (int64(noOfBlocks) * build.PackingEfficiencyNum)
delta -= build.BlockGasTarget
var delta int64
if epoch > build.UpgradeSmokeHeight {
delta = gasLimitUsed / int64(noOfBlocks)
delta -= build.BlockGasTarget
} else {
delta = build.PackingEfficiencyDenom * gasLimitUsed / (int64(noOfBlocks) * build.PackingEfficiencyNum)
delta -= build.BlockGasTarget
}
// cap change at 12.5% (BaseFeeMaxChangeDenom) by capping delta
if delta > build.BlockGasTarget {
@ -73,5 +79,5 @@ func (cs *ChainStore) ComputeBaseFee(ctx context.Context, ts *types.TipSet) (abi
}
parentBaseFee := ts.Blocks()[0].ParentBaseFee
return computeNextBaseFee(parentBaseFee, totalLimit, len(ts.Blocks())), nil
return computeNextBaseFee(parentBaseFee, totalLimit, len(ts.Blocks()), ts.Height()), nil
}

2
chain/store/basefee_test.go
View File

@ -27,7 +27,7 @@ func TestBaseFee(t *testing.T) {
for _, test := range tests {
test := test
t.Run(fmt.Sprintf("%v", test), func(t *testing.T) {
output := computeNextBaseFee(types.NewInt(test.basefee), test.limitUsed, test.noOfBlocks)
output := computeNextBaseFee(types.NewInt(test.basefee), test.limitUsed, test.noOfBlocks, 0)
assert.Equal(t, fmt.Sprintf("%d", test.output), output.String())
})
}