Queue extra work at 2/3 differently depending on whether we're using nonce range or not.

driver-bitforce.c

@@ -425,6 +425,7 @@ static uint64_t bitforce_scanhash(struct thr_info *thr, struct work *work, uint6
 	bitforce->wait_ms = 0;
 	ret = bitforce_send_work(thr, work);
 
+	if (!bitforce->nonce_range) {
 		/* Initially wait 2/3 of the average cycle time so we can request more
 		work before full scan is up */
 		sleep_time = (2 * bitforce->sleep_ms) / 3;
@@ -442,6 +443,15 @@ static uint64_t bitforce_scanhash(struct thr_info *thr, struct work *work, uint6
 			return 1;
 
 		bitforce->wait_ms += sleep_time;
+	} else {
+		sleep_time = bitforce->sleep_ms;
+		ms_to_timeval(sleep_time, &tdiff);
+		if (!restart_wait(&tdiff))
+			return 1;
+		/* queue extra request once more than 2/3 is done */
+		if (work->blk.nonce > 0xffffffff / 3 * 2)
+			queue_request(thr, false);
+	}
 
 	if (ret)
 		ret = bitforce_get_result(thr, work);