VMWARE ESXi5.0 update1 scp from vmkernel is slow

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http://serverfault.com – My ESXi 5.0 update1 is a single server. All my network environment are Giga-LAN equipments and NICs. I want to backup all the files of every guest OS and ftp them to a NAS server. My ESXi server's NIC is capable of running at 1000M bps speed and in VMware vSphere Client, it does show that that NIC is running at 1000M bps/sec. My NAS server's NIC is also running at 1000M bps/sec. However, I found that when I scp files from ESXi host to NAS (or from NAS to host) , the network speed is only 6MB/s. I am sure that my NAS server's network speed is running at 1000bps/sec because when I ftp a big fi (HowTos)