Remove CPU pinning flags that measured slower than the scheduler

sock.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"fmt"
-	"runtime"
 	"unsafe"
 
 	"golang.org/x/sys/unix"
@@ -115,17 +114,6 @@ func newMmsghdrs(bufs [][]byte) ([]mmsghdr, []unix.Iovec) {
 	return hdrs, iovs
 }
 
-func pinTo(cpu int) error {
-	if cpu < 0 {
-		return nil
-	}
-	runtime.LockOSThread()
-	var set unix.CPUSet
-	set.Zero()
-	set.Set(cpu)
-	return unix.SchedSetaffinity(0, &set)
-}
-
 func packetDrops(fd int) uint64 {
 	st, err := unix.GetsockoptTpacketStats(fd, unix.SOL_PACKET, unix.PACKET_STATISTICS)
 	if err != nil {