STM32F107VCT6 开启lwip 后ZI_DATA 过大，导致No Memory

/* SECTION: lwip, a lighwight TCP/IP protocol stack */
#define RT_USING_LWIP
/* LwIP uses RT-Thread Memory Management */
#define RT_LWIP_USING_RT_MEM
/* Enable ICMP protocol*/
#define RT_LWIP_ICMP
/* Enable UDP protocol*/
#define RT_LWIP_UDP
/* Enable TCP protocol*/
#define RT_LWIP_TCP
/* Enable DNS */
#define RT_LWIP_DNS
/* the number of simulatenously active TCP connections*/
#define RT_LWIP_TCP_PCB_NUM    5
/* ip address of target*/
#define RT_LWIP_IPADDR0    192
#define RT_LWIP_IPADDR1    168
#define RT_LWIP_IPADDR2    1
#define RT_LWIP_IPADDR3    30
/* gateway address of target*/
#define RT_LWIP_GWADDR0    192
#define RT_LWIP_GWADDR1    168
#define RT_LWIP_GWADDR2    1
#define RT_LWIP_GWADDR3    1
/* mask address of target*/
#define RT_LWIP_MSKADDR0    255
#define RT_LWIP_MSKADDR1    255
#define RT_LWIP_MSKADDR2    255
#define RT_LWIP_MSKADDR3    0
/* tcp thread options */
#define RT_LWIP_TCPTHREAD_PRIORITY        12
#define RT_LWIP_TCPTHREAD_MBOX_SIZE        4
#define RT_LWIP_TCPTHREAD_STACKSIZE        1024
/* ethernet if thread options */
#define RT_LWIP_ETHTHREAD_PRIORITY        15
#define RT_LWIP_ETHTHREAD_MBOX_SIZE        4
#define RT_LWIP_ETHTHREAD_STACKSIZE        512
/* TCP sender buffer space */
#define RT_LWIP_TCP_SND_BUF    8192
/* TCP receive window. */
#define RT_LWIP_TCP_WND        8192
#define CHECKSUM_CHECK_TCP              0
#define CHECKSUM_CHECK_IP               0
#define CHECKSUM_CHECK_UDP              0
#define CHECKSUM_GEN_TCP                0
#define CHECKSUM_GEN_IP                 0
#define CHECKSUM_GEN_UDP                0