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[lwip-users] Limit on number of TCP connections

From: Alex H
Subject: [lwip-users] Limit on number of TCP connections
Date: Thu, 27 Feb 2020 16:25:01 +0100


I stumbled upon a limitation in the MEMP_NUM_TCP_PCB setting, where the maximum is an unsigned short. I was wondering if there is a simple way to boost this limit, as I get the following warning currently and cannot connect more than 16960 clients:

In file included from lwip/src/core/memp.c:48:
lwip/src/include/lwip/memp.h:106:5: warning: unsigned conversion from ‘int’ to ‘short unsigned int’ changes value from ‘1000000’ to ‘16960’ [-Woverflow]
  106 |     (num), \
      |     ^
lwip/src/core/memp.c:78:42: note: in expansion of macro ‘LWIP_MEMPOOL_DECLARE’
   78 | #define LWIP_MEMPOOL(name,num,size,desc) LWIP_MEMPOOL_DECLARE(name,num,size,desc)
      |                                          ^~~~~~~~~~~~~~~~~~~~
lwip/src/include/lwip/priv/memp_std.h:50:1: note: in expansion of macro ‘LWIP_MEMPOOL’
   50 | LWIP_MEMPOOL(TCP_PCB,        MEMP_NUM_TCP_PCB,         sizeof(struct tcp_pcb),        "TCP_PCB")
      | ^~~~~~~~~~~~

Do you think it would be a big change to boost that unsigned short to an unsigned int? Or is there any memory pool settings I can tinker with to avoid this limitation?

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