lwip 内存分布及大小优化

 

LWIP 2.1.2版本

POOL内存生成流程

//memp_std.h
LWIP_MEMPOOL(UDP_PCB,        MEMP_NUM_UDP_PCB,         sizeof(struct udp_pcb),        "UDP_PCB")
LWIP_MEMPOOL(TCP_PCB,        MEMP_NUM_TCP_PCB,         sizeof(struct tcp_pcb),        "TCP_PCB")
LWIP_MEMPOOL(TCP_PCB_LISTEN, MEMP_NUM_TCP_PCB_LISTEN,  sizeof(struct tcp_pcb_listen), "TCP_PCB_LISTEN")
LWIP_MEMPOOL(TCP_SEG,        MEMP_NUM_TCP_SEG,         sizeof(struct tcp_seg),        "TCP_SEG")
LWIP_PBUF_MEMPOOL(PBUF_POOL, PBUF_POOL_SIZE,           PBUF_POOL_BUFSIZE,             "PBUF_POOL")


#define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEMPOOL_DECLARE(name,num,size,desc)


//memp.h
#define LWIP_MEMPOOL_DECLARE(name,num,size,desc) \
  LWIP_DECLARE_MEMORY_ALIGNED(memp_memory_ ## name ## _base, ((num) * (MEMP_SIZE + MEMP_ALIGN_SIZE(size)))); \
    \
  LWIP_MEMPOOL_DECLARE_STATS_INSTANCE(memp_stats_ ## name) \
    \
  static struct memp *memp_tab_ ## name; \
    \
  const struct memp_desc memp_ ## name = { \
    DECLARE_LWIP_MEMPOOL_DESC(desc) \
    LWIP_MEMPOOL_DECLARE_STATS_REFERENCE(memp_stats_ ## name) \
    LWIP_MEM_ALIGN_SIZE(size), \
    (num), \
    memp_memory_ ## name ## _base, \
    &memp_tab_ ## name \
  };

//arch.h
#define LWIP_DECLARE_MEMORY_ALIGNED(variable_name, size) u8_t variable_name[LWIP_MEM_ALIGN_BUFFER(size)]

汇总以下数组:
memp_memory_UDP_PCB_base
memp_memory_TCP_PCB_base
memp_memory_TCP_PCB_LISTEN_base
memp_memory_TCP_SEG_base
memp_memory_PBUF_POOL_base

 

参考链接:

https://club.rt-thread.org/ask/article/8624ed0cf00f006f.html

https://www.cnblogs.com/lizhuming/p/15487079.html