ping: Fix mapping initialize

Author: nekohasekai

route_direct.go

@@ -3,6 +3,7 @@ package tun
 import (
 	"math"
 	"net/netip"
+	"runtime"
 	"time"
 
 	"github.com/sagernet/sing/common"
@@ -30,7 +31,7 @@ type DirectRouteMapping struct {
 }
 
 func NewDirectRouteMapping(timeout time.Duration) *DirectRouteMapping {
-	mapping := common.Must1(freelru.NewSharded[DirectRouteSession, DirectRouteDestination](math.MaxUint16, maphash.NewHasher[DirectRouteSession]().Hash32))
+	mapping := common.Must1(freelru.NewShardedWithSize[DirectRouteSession, DirectRouteDestination](uint32(runtime.GOMAXPROCS(0)*16), math.MaxUint16, math.MaxUint8, maphash.NewHasher[DirectRouteSession]().Hash32))
 	mapping.SetHealthCheck(func(session DirectRouteSession, action DirectRouteDestination) bool {
 		if action != nil {
 			return !action.IsClosed()