please help me a VPP issue

[Rtoax]

when i execute the following command

lshw -class network -businfo

Bus info Device Class Description

pci@0000:19:00.0 em3 network NetXtreme BCM5720 Gigabit Ethernet PCIe
pci@0000:19:00.1 em4 network NetXtreme BCM5720 Gigabit Ethernet PCIe
pci@0000:18:00.0 em1 network NetXtreme BCM5720 Gigabit Ethernet PCIe
pci@0000:18:00.1 em2 network NetXtreme BCM5720 Gigabit Ethernet PCIe
pci@0000:3b:00.0 network Ethernet 10G 2P X520 Adapter
pci@0000:3b:00.1 network Ethernet 10G 2P X520 Adapter

then i configure startup.conf file as follows
93 # DPDK 相关配置 rongtao@sylincom.com
94 dpdk {
95 socket-mem 1024
96 dev 0000:3b:00.0
97 }

however, when i start up the vpp, where is a problem

vpp -c startup.conf

vlib_call_all_config_functions: unknown input `dpdk socket-mem 1024 dev 0000:3b:00.0 '

i don't know what to do, please help me if you see this ISSUE.