Use a half nonce range before cycling through avalon's scanwork to ensure it gets a chance to fill work if time is tight for the write thread to signal a wakeup.

driver-avalon.c

@@ -1046,8 +1046,8 @@ static int64_t avalon_scanhash(struct thr_info *thr)
 	int64_t hash_count, us_timeout;
 	struct timespec abstime;
 
-	/* Full nonce range */
+	/* Half nonce range */
-	us_timeout = 0x100000000ll / info->asic_count / info->frequency;
+	us_timeout = 0x80000000ll / info->asic_count / info->frequency;
 	tdiff.tv_sec = us_timeout / 1000000;
 	tdiff.tv_usec = us_timeout - (tdiff.tv_sec * 1000000);
 	cgtime(&now);