From ea295bd694250b077b780cfd506cf4d7f6fd1471 Mon Sep 17 00:00:00 2001
From: =?utf8?q?=C3=98yvind=20Harboe?= <oyvind.harboe@zylin.com>
Date: Fri, 14 Oct 2011 15:05:45 +0200
Subject: [PATCH] target: DCC / target message backoff algorithm
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by immediately polling again when we have received a message from
the target instead of waiting 100ms, we can hope for much better
performance. More than 100x? :-)

Change-Id: Ieaf0c6c8b6e5addc482895670ffbf9a743e07a29
Signed-off-by: Øyvind Harboe <oyvind.harboe@zylin.com>
Reviewed-on: http://openocd.zylin.com/27
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>
Tested-by: Øyvind Harboe <oyvindharboe@gmail.com>
---
 src/server/server.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/server/server.c b/src/server/server.c
index c70a5222..84ec1ac9 100644
--- a/src/server/server.c
+++ b/src/server/server.c
@@ -29,6 +29,7 @@
 
 #include "server.h"
 #include <target/target.h>
+#include <target/target_request.h>
 #include "openocd.h"
 #include "tcl_server.h"
 #include "telnet_server.h"
@@ -443,6 +444,13 @@ int server_loop(struct command_context *command_context)
 			poll_ok = true;
 		}
 
+		/* This is a simple back-off algorithm where we immediately
+		 * re-poll if we did something this time around.
+		 *
+		 * This greatly improves performance of DCC.
+		 */
+		poll_ok = poll_ok || target_got_message();
+
 		for (service = services; service; service = service->next)
 		{
 			/* handle new connections on listeners */
-- 
2.39.5