Packet buffers (Pbufs) carry packets across various layers of the TCP/IP stack. The following are the pbuf memory options provided by the lwIP stack. Default values work well unless application tuning is required. The following table describes the parameters for the Pbuf memory options.
| Attribute | Default | Type | Description |
|---|---|---|---|
| pbuf_pool_size | 256 | Integer | Number of buffers in pbuf pool. For high performance systems, you might consider increasing the pbuf pool size to a higher value, for example 512. |
| pbuf_pool_bufsize | 1700 | Integer | Size of each pbuf in pbuf pool. For systems that support jumbo frames, you might consider using a pbuf pool buffer size that is more than the maximum jumbo frame size. |
| pbuf_link_hlen | 16 | Integer | Number of bytes that should be allocated for a link level header. |