Revert "make the number of p2p parallel enqueue routines fixable (#4)"

This reverts commit 13b41d4.

eth/handler_eth.go

@@ -20,29 +20,26 @@ import (
 	"errors"
 	"fmt"
 	"math/big"
-	"runtime"
 	"time"
 
 	"github.com/ethereum/go-ethereum/common"
 	"github.com/ethereum/go-ethereum/core"
 	"github.com/ethereum/go-ethereum/core/types"
 	"github.com/ethereum/go-ethereum/eth/fetcher"
 	"github.com/ethereum/go-ethereum/eth/protocols/eth"
-	"github.com/ethereum/go-ethereum/log"
 	"github.com/ethereum/go-ethereum/p2p/enode"
 )
 
 // TxQueueSize is the size of the transaction queue used to enqueue transactions
-var (
-	TxQueueSize = runtime.NumCPU()
+const (
+	TxQueueSize = 16
 )
 
 // enqueueTx is a channel to enqueue transactions in parallel.
 // It is used to improve the performance of transaction enqueued.
 var enqueueTx = make(chan func(), TxQueueSize)
 
 func init() {
-	log.Info("P2P euqneue parallel thread number", "threadNum", TxQueueSize)
 	// run the transaction enqueuing loop
 	for i := 0; i < TxQueueSize; i++ {
 		go func() {