Merge pull request #17546 from karalabe/miner-max-limit

cmd, core, eth, miner, params: configurable gas floor and ceil

20 files changed, 88 insertions, 49 deletions

diff --git a/cmd/geth/main.go b/cmd/geth/main.go
index 0ed67d0d5..4d7e98698 100644
--- a/cmd/geth/main.go
+++ b/cmd/geth/main.go
@@ -101,6 +101,7 @@ var (
 		utils.MinerNotifyFlag,
 		utils.MinerGasTargetFlag,
 		utils.MinerLegacyGasTargetFlag,
+		utils.MinerGasLimitFlag,
 		utils.MinerGasPriceFlag,
 		utils.MinerLegacyGasPriceFlag,
 		utils.MinerEtherbaseFlag,
@@ -236,7 +237,6 @@ func init() {
 		// Start system runtime metrics collection
 		go metrics.CollectProcessMetrics(3 * time.Second)
 
-		utils.SetupNetwork(ctx)
 		return nil
 	}
 
diff --git a/cmd/geth/usage.go b/cmd/geth/usage.go
index 2f8260e0f..a674eca4f 100644
--- a/cmd/geth/usage.go
+++ b/cmd/geth/usage.go
@@ -189,6 +189,7 @@ var AppHelpFlagGroups = []flagGroup{
 			utils.MinerNotifyFlag,
 			utils.MinerGasPriceFlag,
 			utils.MinerGasTargetFlag,
+			utils.MinerGasLimitFlag,
 			utils.MinerEtherbaseFlag,
 			utils.MinerExtraDataFlag,
 			utils.MinerRecommitIntervalFlag,
diff --git a/cmd/puppeth/module_node.go b/cmd/puppeth/module_node.go
index 8ad41555e..038152a3e 100644
--- a/cmd/puppeth/module_node.go
+++ b/cmd/puppeth/module_node.go
@@ -42,7 +42,7 @@ ADD genesis.json /genesis.json
 RUN \
   echo 'geth --cache 512 init /genesis.json' > geth.sh && \{{if .Unlock}}
 	echo 'mkdir -p /root/.ethereum/keystore/ && cp /signer.json /root/.ethereum/keystore/' >> geth.sh && \{{end}}
-	echo $'exec geth --networkid {{.NetworkID}} --cache 512 --port {{.Port}} --maxpeers {{.Peers}} {{.LightFlag}} --ethstats \'{{.Ethstats}}\' {{if .Bootnodes}}--bootnodes {{.Bootnodes}}{{end}} {{if .Etherbase}}--miner.etherbase {{.Etherbase}} --mine --miner.threads 1{{end}} {{if .Unlock}}--unlock 0 --password /signer.pass --mine{{end}} --miner.gastarget {{.GasTarget}} --miner.gasprice {{.GasPrice}}' >> geth.sh
+	echo $'exec geth --networkid {{.NetworkID}} --cache 512 --port {{.Port}} --maxpeers {{.Peers}} {{.LightFlag}} --ethstats \'{{.Ethstats}}\' {{if .Bootnodes}}--bootnodes {{.Bootnodes}}{{end}} {{if .Etherbase}}--miner.etherbase {{.Etherbase}} --mine --miner.threads 1{{end}} {{if .Unlock}}--unlock 0 --password /signer.pass --mine{{end}} --miner.gastarget {{.GasTarget}} --miner.gaslimit {{.GasLimit}} --miner.gasprice {{.GasPrice}}' >> geth.sh
 
 ENTRYPOINT ["/bin/sh", "geth.sh"]
 `
@@ -68,6 +68,7 @@ services:
       - STATS_NAME={{.Ethstats}}
       - MINER_NAME={{.Etherbase}}
       - GAS_TARGET={{.GasTarget}}
+      - GAS_LIMIT={{.GasLimit}}
       - GAS_PRICE={{.GasPrice}}
     logging:
       driver: "json-file"
@@ -104,6 +105,7 @@ func deployNode(client *sshClient, network string, bootnodes []string, config *n
 		"Ethstats":  config.ethstats,
 		"Etherbase": config.etherbase,
 		"GasTarget": uint64(1000000 * config.gasTarget),
+		"GasLimit":  uint64(1000000 * config.gasLimit),
 		"GasPrice":  uint64(1000000000 * config.gasPrice),
 		"Unlock":    config.keyJSON != "",
 	})
@@ -122,6 +124,7 @@ func deployNode(client *sshClient, network string, bootnodes []string, config *n
 		"Ethstats":   config.ethstats[:strings.Index(config.ethstats, ":")],
 		"Etherbase":  config.etherbase,
 		"GasTarget":  config.gasTarget,
+		"GasLimit":   config.gasLimit,
 		"GasPrice":   config.gasPrice,
 	})
 	files[filepath.Join(workdir, "docker-compose.yaml")] = composefile.Bytes()
@@ -160,6 +163,7 @@ type nodeInfos struct {
 	keyJSON    string
 	keyPass    string
 	gasTarget  float64
+	gasLimit   float64
 	gasPrice   float64
 }
 
@@ -175,8 +179,9 @@ func (info *nodeInfos) Report() map[string]string {
 	}
 	if info.gasTarget > 0 {
 		// Miner or signer node
-		report["Gas limit (baseline target)"] = fmt.Sprintf("%0.3f MGas", info.gasTarget)
 		report["Gas price (minimum accepted)"] = fmt.Sprintf("%0.3f GWei", info.gasPrice)
+		report["Gas floor (baseline target)"] = fmt.Sprintf("%0.3f MGas", info.gasTarget)
+		report["Gas ceil  (target maximum)"] = fmt.Sprintf("%0.3f MGas", info.gasLimit)
 
 		if info.etherbase != "" {
 			// Ethash proof-of-work miner
@@ -217,6 +222,7 @@ func checkNode(client *sshClient, network string, boot bool) (*nodeInfos, error)
 	totalPeers, _ := strconv.Atoi(infos.envvars["TOTAL_PEERS"])
 	lightPeers, _ := strconv.Atoi(infos.envvars["LIGHT_PEERS"])
 	gasTarget, _ := strconv.ParseFloat(infos.envvars["GAS_TARGET"], 64)
+	gasLimit, _ := strconv.ParseFloat(infos.envvars["GAS_LIMIT"], 64)
 	gasPrice, _ := strconv.ParseFloat(infos.envvars["GAS_PRICE"], 64)
 
 	// Container available, retrieve its node ID and its genesis json
@@ -256,6 +262,7 @@ func checkNode(client *sshClient, network string, boot bool) (*nodeInfos, error)
 		keyJSON:    keyJSON,
 		keyPass:    keyPass,
 		gasTarget:  gasTarget,
+		gasLimit:   gasLimit,
 		gasPrice:   gasPrice,
 	}
 	stats.enode = fmt.Sprintf("enode://%s@%s:%d", id, client.address, stats.port)
diff --git a/cmd/puppeth/wizard_node.go b/cmd/puppeth/wizard_node.go
index 9b22da446..49b10a023 100644
--- a/cmd/puppeth/wizard_node.go
+++ b/cmd/puppeth/wizard_node.go
@@ -50,7 +50,7 @@ func (w *wizard) deployNode(boot bool) {
 		if boot {
 			infos = &nodeInfos{port: 30303, peersTotal: 512, peersLight: 256}
 		} else {
-			infos = &nodeInfos{port: 30303, peersTotal: 50, peersLight: 0, gasTarget: 4.7, gasPrice: 18}
+			infos = &nodeInfos{port: 30303, peersTotal: 50, peersLight: 0, gasTarget: 7.5, gasLimit: 10, gasPrice: 1}
 		}
 	}
 	existed := err == nil
@@ -153,6 +153,10 @@ func (w *wizard) deployNode(boot bool) {
 		infos.gasTarget = w.readDefaultFloat(infos.gasTarget)
 
 		fmt.Println()
+		fmt.Printf("What gas limit should full blocks target (MGas)? (default = %0.3f)\n", infos.gasLimit)
+		infos.gasLimit = w.readDefaultFloat(infos.gasLimit)
+
+		fmt.Println()
 		fmt.Printf("What gas price should the signer require (GWei)? (default = %0.3f)\n", infos.gasPrice)
 		infos.gasPrice = w.readDefaultFloat(infos.gasPrice)
 	}
diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 13430ad56..495bfe13e 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -329,12 +329,17 @@ var (
 	MinerGasTargetFlag = cli.Uint64Flag{
 		Name:  "miner.gastarget",
 		Usage: "Target gas floor for mined blocks",
-		Value: params.GenesisGasLimit,
+		Value: eth.DefaultConfig.MinerGasFloor,
 	}
 	MinerLegacyGasTargetFlag = cli.Uint64Flag{
 		Name:  "targetgaslimit",
 		Usage: "Target gas floor for mined blocks (deprecated, use --miner.gastarget)",
-		Value: params.GenesisGasLimit,
+		Value: eth.DefaultConfig.MinerGasFloor,
+	}
+	MinerGasLimitFlag = cli.Uint64Flag{
+		Name:  "miner.gaslimit",
+		Usage: "Target gas ceiling for mined blocks",
+		Value: eth.DefaultConfig.MinerGasCeil,
 	}
 	MinerGasPriceFlag = BigFlag{
 		Name:  "miner.gasprice",
@@ -1146,6 +1151,15 @@ func SetEthConfig(ctx *cli.Context, stack *node.Node, cfg *eth.Config) {
 	if ctx.GlobalIsSet(MinerExtraDataFlag.Name) {
 		cfg.MinerExtraData = []byte(ctx.GlobalString(MinerExtraDataFlag.Name))
 	}
+	if ctx.GlobalIsSet(MinerLegacyGasTargetFlag.Name) {
+		cfg.MinerGasFloor = ctx.GlobalUint64(MinerLegacyGasTargetFlag.Name)
+	}
+	if ctx.GlobalIsSet(MinerGasTargetFlag.Name) {
+		cfg.MinerGasFloor = ctx.GlobalUint64(MinerGasTargetFlag.Name)
+	}
+	if ctx.GlobalIsSet(MinerGasLimitFlag.Name) {
+		cfg.MinerGasCeil = ctx.GlobalUint64(MinerGasLimitFlag.Name)
+	}
 	if ctx.GlobalIsSet(MinerLegacyGasPriceFlag.Name) {
 		cfg.MinerGasPrice = GlobalBig(ctx, MinerLegacyGasPriceFlag.Name)
 	}
@@ -1270,15 +1284,6 @@ func RegisterEthStatsService(stack *node.Node, url string) {
 	}
 }
 
-// SetupNetwork configures the system for either the main net or some test network.
-func SetupNetwork(ctx *cli.Context) {
-	// TODO(fjl): move target gas limit into config
-	params.TargetGasLimit = ctx.GlobalUint64(MinerLegacyGasTargetFlag.Name)
-	if ctx.GlobalIsSet(MinerGasTargetFlag.Name) {
-		params.TargetGasLimit = ctx.GlobalUint64(MinerGasTargetFlag.Name)
-	}
-}
-
 func SetupMetrics(ctx *cli.Context) {
 	if metrics.Enabled {
 		log.Info("Enabling metrics collection")
diff --git a/core/bench_test.go b/core/bench_test.go
index 748aebe40..8d95456e9 100644
--- a/core/bench_test.go
+++ b/core/bench_test.go
@@ -111,7 +111,8 @@ func init() {
 func genTxRing(naccounts int) func(int, *BlockGen) {
 	from := 0
 	return func(i int, gen *BlockGen) {
-		gas := CalcGasLimit(gen.PrevBlock(i - 1))
+		block := gen.PrevBlock(i - 1)
+		gas := CalcGasLimit(block, block.GasLimit(), block.GasLimit())
 		for {
 			gas -= params.TxGas
 			if gas < params.TxGas {
diff --git a/core/block_validator.go b/core/block_validator.go
index ecd6a89bc..1329f6242 100644
--- a/core/block_validator.go
+++ b/core/block_validator.go
@@ -101,9 +101,11 @@ func (v *BlockValidator) ValidateState(block, parent *types.Block, statedb *stat
 	return nil
 }
 
-// CalcGasLimit computes the gas limit of the next block after parent.
-// This is miner strategy, not consensus protocol.
-func CalcGasLimit(parent *types.Block) uint64 {
+// CalcGasLimit computes the gas limit of the next block after parent. It aims
+// to keep the baseline gas above the provided floor, and increase it towards the
+// ceil if the blocks are full. If the ceil is exceeded, it will always decrease
+// the gas allowance.
+func CalcGasLimit(parent *types.Block, gasFloor, gasCeil uint64) uint64 {
 	// contrib = (parentGasUsed * 3 / 2) / 1024
 	contrib := (parent.GasUsed() + parent.GasUsed()/2) / params.GasLimitBoundDivisor
 
@@ -121,12 +123,16 @@ func CalcGasLimit(parent *types.Block) uint64 {
 	if limit < params.MinGasLimit {
 		limit = params.MinGasLimit
 	}
-	// however, if we're now below the target (TargetGasLimit) we increase the
-	// limit as much as we can (parentGasLimit / 1024 -1)
-	if limit < params.TargetGasLimit {
+	// If we're outside our allowed gas range, we try to hone towards them
+	if limit < gasFloor {
 		limit = parent.GasLimit() + decay
-		if limit > params.TargetGasLimit {
-			limit = params.TargetGasLimit
+		if limit > gasFloor {
+			limit = gasFloor
+		}
+	} else if limit > gasCeil {
+		limit = parent.GasLimit() - decay
+		if limit < gasCeil {
+			limit = gasCeil
 		}
 	}
 	return limit
diff --git a/core/chain_makers.go b/core/chain_makers.go
index c1e4b4264..de0fc6be9 100644
--- a/core/chain_makers.go
+++ b/core/chain_makers.go
@@ -240,7 +240,7 @@ func makeHeader(chain consensus.ChainReader, parent *types.Block, state *state.S
 			Difficulty: parent.Difficulty(),
 			UncleHash:  parent.UncleHash(),
 		}),
-		GasLimit: CalcGasLimit(parent),
+		GasLimit: CalcGasLimit(parent, parent.GasLimit(), parent.GasLimit()),
 		Number:   new(big.Int).Add(parent.Number(), common.Big1),
 		Time:     time,
 	}
diff --git a/eth/backend.go b/eth/backend.go
index 3032e1a6d..9926225f2 100644
--- a/eth/backend.go
+++ b/eth/backend.go
@@ -173,7 +173,7 @@ func New(ctx *node.ServiceContext, config *Config) (*Ethereum, error) {
 		return nil, err
 	}
 
-	eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.engine, config.MinerRecommit)
+	eth.miner = miner.New(eth, eth.chainConfig, eth.EventMux(), eth.engine, config.MinerRecommit, config.MinerGasFloor, config.MinerGasCeil)
 	eth.miner.SetExtra(makeExtraData(config.MinerExtraData))
 
 	eth.APIBackend = &EthAPIBackend{eth, nil}
diff --git a/eth/config.go b/eth/config.go
index 517d7d8f3..f1a402e37 100644
--- a/eth/config.go
+++ b/eth/config.go
@@ -48,7 +48,9 @@ var DefaultConfig = Config{
 	DatabaseCache: 768,
 	TrieCache:     256,
 	TrieTimeout:   60 * time.Minute,
-	MinerGasPrice: big.NewInt(18 * params.Shannon),
+	MinerGasFloor: 8000000,
+	MinerGasCeil:  8000000,
+	MinerGasPrice: big.NewInt(params.GWei),
 	MinerRecommit: 3 * time.Second,
 
 	TxPool: core.DefaultTxPoolConfig,
@@ -99,6 +101,8 @@ type Config struct {
 	Etherbase      common.Address `toml:",omitempty"`
 	MinerNotify    []string       `toml:",omitempty"`
 	MinerExtraData []byte         `toml:",omitempty"`
+	MinerGasFloor  uint64
+	MinerGasCeil   uint64
 	MinerGasPrice  *big.Int
 	MinerRecommit  time.Duration
 	MinerNoverify  bool
diff --git a/eth/gasprice/gasprice.go b/eth/gasprice/gasprice.go
index 54325692c..3b8db78a1 100644
--- a/eth/gasprice/gasprice.go
+++ b/eth/gasprice/gasprice.go
@@ -29,7 +29,7 @@ import (
 	"github.com/ethereum/go-ethereum/rpc"
 )
 
-var maxPrice = big.NewInt(500 * params.Shannon)
+var maxPrice = big.NewInt(500 * params.GWei)
 
 type Config struct {
 	Blocks     int
diff --git a/eth/gen_config.go b/eth/gen_config.go
index df4ffeb11..d401a917d 100644
--- a/eth/gen_config.go
+++ b/eth/gen_config.go
@@ -33,6 +33,8 @@ func (c Config) MarshalTOML() (interface{}, error) {
 		Etherbase               common.Address `toml:",omitempty"`
 		MinerNotify             []string       `toml:",omitempty"`
 		MinerExtraData          hexutil.Bytes  `toml:",omitempty"`
+		MinerGasFloor           uint64
+		MinerGasCeil            uint64
 		MinerGasPrice           *big.Int
 		MinerRecommit           time.Duration
 		MinerNoverify           bool
@@ -57,6 +59,8 @@ func (c Config) MarshalTOML() (interface{}, error) {
 	enc.Etherbase = c.Etherbase
 	enc.MinerNotify = c.MinerNotify
 	enc.MinerExtraData = c.MinerExtraData
+	enc.MinerGasFloor = c.MinerGasFloor
+	enc.MinerGasCeil = c.MinerGasCeil
 	enc.MinerGasPrice = c.MinerGasPrice
 	enc.MinerRecommit = c.MinerRecommit
 	enc.MinerNoverify = c.MinerNoverify
@@ -85,6 +89,8 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 		Etherbase               *common.Address `toml:",omitempty"`
 		MinerNotify             []string        `toml:",omitempty"`
 		MinerExtraData          *hexutil.Bytes  `toml:",omitempty"`
+		MinerGasFloor           *uint64
+		MinerGasCeil            *uint64
 		MinerGasPrice           *big.Int
 		MinerRecommit           *time.Duration
 		MinerNoverify           *bool
@@ -140,6 +146,12 @@ func (c *Config) UnmarshalTOML(unmarshal func(interface{}) error) error {
 	if dec.MinerExtraData != nil {
 		c.MinerExtraData = *dec.MinerExtraData
 	}
+	if dec.MinerGasFloor != nil {
+		c.MinerGasFloor = *dec.MinerGasFloor
+	}
+	if dec.MinerGasCeil != nil {
+		c.MinerGasCeil = *dec.MinerGasCeil
+	}
 	if dec.MinerGasPrice != nil {
 		c.MinerGasPrice = dec.MinerGasPrice
 	}
diff --git a/internal/ethapi/api.go b/internal/ethapi/api.go
index a465a5904..f7379e228 100644
--- a/internal/ethapi/api.go
+++ b/internal/ethapi/api.go
@@ -47,7 +47,7 @@ import (
 )
 
 const (
-	defaultGasPrice = 50 * params.Shannon
+	defaultGasPrice = params.GWei
 )
 
 // PublicEthereumAPI provides an API to access Ethereum related information.
diff --git a/miner/miner.go b/miner/miner.go
index c5a0c9d62..7f194db26 100644
--- a/miner/miner.go
+++ b/miner/miner.go
@@ -52,13 +52,13 @@ type Miner struct {
 	shouldStart int32 // should start indicates whether we should start after sync
 }
 
-func New(eth Backend, config *params.ChainConfig, mux *event.TypeMux, engine consensus.Engine, recommit time.Duration) *Miner {
+func New(eth Backend, config *params.ChainConfig, mux *event.TypeMux, engine consensus.Engine, recommit time.Duration, gasFloor, gasCeil uint64) *Miner {
 	miner := &Miner{
 		eth:      eth,
 		mux:      mux,
 		engine:   engine,
 		exitCh:   make(chan struct{}),
-		worker:   newWorker(config, engine, eth, mux, recommit),
+		worker:   newWorker(config, engine, eth, mux, recommit, gasFloor, gasCeil),
 		canStart: 1,
 	}
 	go miner.update()
diff --git a/miner/stress_clique.go b/miner/stress_clique.go
index 8545b9413..8961091d5 100644
--- a/miner/stress_clique.go
+++ b/miner/stress_clique.go
@@ -206,6 +206,8 @@ func makeSealer(genesis *core.Genesis, nodes []string) (*node.Node, error) {
 			DatabaseHandles: 256,
 			TxPool:          core.DefaultTxPoolConfig,
 			GPO:             eth.DefaultConfig.GPO,
+			MinerGasFloor:   genesis.GasLimit * 9 / 10,
+			MinerGasCeil:    genesis.GasLimit * 11 / 10,
 			MinerGasPrice:   big.NewInt(1),
 			MinerRecommit:   time.Second,
 		})
diff --git a/miner/stress_ethash.go b/miner/stress_ethash.go
index 4ed8aeee4..5ed11d73a 100644
--- a/miner/stress_ethash.go
+++ b/miner/stress_ethash.go
@@ -186,6 +186,8 @@ func makeMiner(genesis *core.Genesis, nodes []string) (*node.Node, error) {
 			TxPool:          core.DefaultTxPoolConfig,
 			GPO:             eth.DefaultConfig.GPO,
 			Ethash:          eth.DefaultConfig.Ethash,
+			MinerGasFloor:   genesis.GasLimit * 9 / 10,
+			MinerGasCeil:    genesis.GasLimit * 11 / 10,
 			MinerGasPrice:   big.NewInt(1),
 			MinerRecommit:   time.Second,
 		})
diff --git a/miner/worker.go b/miner/worker.go
index ca68da6e9..5348cb3f1 100644
--- a/miner/worker.go
+++ b/miner/worker.go
@@ -127,6 +127,9 @@ type worker struct {
 	eth    Backend
 	chain  *core.BlockChain
 
+	gasFloor uint64
+	gasCeil  uint64
+
 	// Subscriptions
 	mux          *event.TypeMux
 	txsCh        chan core.NewTxsEvent
@@ -171,13 +174,15 @@ type worker struct {
 	resubmitHook func(time.Duration, time.Duration) // Method to call upon updating resubmitting interval.
 }
 
-func newWorker(config *params.ChainConfig, engine consensus.Engine, eth Backend, mux *event.TypeMux, recommit time.Duration) *worker {
+func newWorker(config *params.ChainConfig, engine consensus.Engine, eth Backend, mux *event.TypeMux, recommit time.Duration, gasFloor, gasCeil uint64) *worker {
 	worker := &worker{
 		config:             config,
 		engine:             engine,
 		eth:                eth,
 		mux:                mux,
 		chain:              eth.BlockChain(),
+		gasFloor:           gasFloor,
+		gasCeil:            gasCeil,
 		possibleUncles:     make(map[common.Hash]*types.Block),
 		unconfirmed:        newUnconfirmedBlocks(eth.BlockChain(), miningLogAtDepth),
 		pendingTasks:       make(map[common.Hash]*task),
@@ -807,7 +812,7 @@ func (w *worker) commitNewWork(interrupt *int32, noempty bool) {
 	header := &types.Header{
 		ParentHash: parent.Hash(),
 		Number:     num.Add(num, common.Big1),
-		GasLimit:   core.CalcGasLimit(parent),
+		GasLimit:   core.CalcGasLimit(parent, w.gasFloor, w.gasCeil),
 		Extra:      w.extra,
 		Time:       big.NewInt(tstamp),
 	}
diff --git a/miner/worker_test.go b/miner/worker_test.go
index 16708c18c..9f9a3b4a5 100644
--- a/miner/worker_test.go
+++ b/miner/worker_test.go
@@ -119,7 +119,7 @@ func (b *testWorkerBackend) PostChainEvents(events []interface{}) {
 func newTestWorker(t *testing.T, chainConfig *params.ChainConfig, engine consensus.Engine) (*worker, *testWorkerBackend) {
 	backend := newTestWorkerBackend(t, chainConfig, engine)
 	backend.txPool.AddLocals(pendingTxs)
-	w := newWorker(chainConfig, engine, backend, new(event.TypeMux), time.Second)
+	w := newWorker(chainConfig, engine, backend, new(event.TypeMux), time.Second, params.GenesisGasLimit, params.GenesisGasLimit)
 	w.setEtherbase(testBankAddress)
 	return w, backend
 }
diff --git a/params/denomination.go b/params/denomination.go
index 1a309827d..fb4da7f41 100644
--- a/params/denomination.go
+++ b/params/denomination.go
@@ -17,18 +17,12 @@
 package params
 
 // These are the multipliers for ether denominations.
-// Example: To get the wei value of an amount in 'douglas', use
+// Example: To get the wei value of an amount in 'gwei', use
 //
-//    new(big.Int).Mul(value, big.NewInt(params.Douglas))
+//    new(big.Int).Mul(value, big.NewInt(params.GWei))
 //
 const (
-	Wei      = 1
-	Ada      = 1e3
-	Babbage  = 1e6
-	Shannon  = 1e9
-	Szabo    = 1e12
-	Finney   = 1e15
-	Ether    = 1e18
-	Einstein = 1e21
-	Douglas  = 1e42
+	Wei   = 1
+	GWei  = 1e9
+	Ether = 1e18
 )
diff --git a/params/protocol_params.go b/params/protocol_params.go
index 46624ac9a..4b53b3320 100644
--- a/params/protocol_params.go
+++ b/params/protocol_params.go
@@ -18,10 +18,6 @@ package params
 
 import "math/big"
 
-var (
-	TargetGasLimit = GenesisGasLimit // The artificial target
-)
-
 const (
 	GasLimitBoundDivisor uint64 = 1024    // The bound divisor of the gas limit, used in update calculations.
 	MinGasLimit          uint64 = 5000    // Minimum the gas limit may ever be.