Queue multiple requests at once when levels are low.

cgminer.c

@@ -3529,7 +3529,7 @@ static time_t requested_tv_sec;
 
 static bool queue_request(struct thr_info *thr, bool needed)
 {
-	int rq = requests_queued(), rs = requests_staged();
+	int toq, rq = requests_queued(), rs = requests_staged();
 	struct workio_cmd *wc;
 	struct timeval now;
 	time_t scan_post;
@@ -3549,6 +3549,14 @@ static bool queue_request(struct thr_info *thr, bool needed)
 	    now.tv_sec - requested_tv_sec < scan_post)
 		return true;
 
+	requested_tv_sec = now.tv_sec;
+
+	if (rq > rs)
+		toq = rq - mining_threads;
+	else
+		toq = rs - mining_threads;
+
+	do {
 		inc_queued();
 
 		/* fill out work request message */
@@ -3579,7 +3587,8 @@ static bool queue_request(struct thr_info *thr, bool needed)
 			return false;
 		}
 
-	requested_tv_sec = now.tv_sec;
+	} while (--toq > 0);
+
 	return true;
 }