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libftdi: Disable Nagle algorithm and buffer sends internally. 

This significantly improves performance by not waiting for TCP
timeout on transmission.
This commit is contained in:
Gareth McMullin 2016-10-25 10:07:04 -07:00
parent 917c107ded
commit f947465fe4
1 changed files with 11 additions and 5 deletions
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16
src/platforms/libftdi/gdb_if.c
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@ -27,6 +27,7 @@
#ifndef WIN32
# include <sys/socket.h>
# include <netinet/in.h>
# include <netinet/tcp.h>
# include <sys/select.h>
#else
# include <winsock2.h>
@ -57,6 +58,7 @@ int gdb_if_init(void)
assert((gdb_if_serv = socket(PF_INET, SOCK_STREAM, 0)) != -1);
opt = 1;
assert(setsockopt(gdb_if_serv, SOL_SOCKET, SO_REUSEADDR, (void*)&opt, sizeof(opt)) != -1);
assert(setsockopt(gdb_if_serv, IPPROTO_TCP, TCP_NODELAY, (void*)&opt, sizeof(opt)) != -1);
assert(bind(gdb_if_serv, (void*)&addr, sizeof(addr)) != -1);
assert(listen(gdb_if_serv, 1) != -1);
@ -109,9 +111,13 @@ unsigned char gdb_if_getchar_to(int timeout)
void gdb_if_putchar(unsigned char c, int flush)
{
(void)flush;
if (gdb_if_conn > 0)
send(gdb_if_conn, (void*)&c, 1, 0);
static uint8_t buf[2048];
static int bufsize = 0;
if (gdb_if_conn > 0) {
buf[bufsize++] = c;
if (flush || (bufsize == sizeof(buf))) {
send(gdb_if_conn, buf, bufsize, 0);
bufsize = 0;
}
}
}