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extmod/modlwip: Commit TCP out data to lower layers if buffer gets full. 

Dramatically improves TCP sending throughput because without an explicit
call to tcp_output() the data is only sent to the lower layers via the
lwIP slow timer which (by default) ticks every 500ms.
This commit is contained in:
Damien George 2017-10-31 13:50:08 +11:00
parent e511f24ddd
commit 48f6990fbc
1 changed files with 5 additions and 0 deletions
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5
extmod/modlwip.c
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@ -498,6 +498,11 @@ STATIC mp_uint_t lwip_tcp_send(lwip_socket_obj_t *socket, const byte *buf, mp_ui
err_t err = tcp_write(socket->pcb.tcp, buf, write_len, TCP_WRITE_FLAG_COPY);
// If the output buffer is getting full then send the data to the lower layers
if (err == ERR_OK && tcp_sndbuf(socket->pcb.tcp) < TCP_SND_BUF / 4) {
err = tcp_output(socket->pcb.tcp);
}
if (err != ERR_OK) {
*_errno = error_lookup_table[-err];
return MP_STREAM_ERROR;