--- rsync-3.0.7.orig/fileio.c
+++ rsync-3.0.7/fileio.c
@@ -169,6 +169,8 @@
 	map->file_size = len;
 	map->def_window_size = read_size;
 
+	posix_fadvise(fd, 0, 0, POSIX_FADV_DONTNEED);
+
 	return map;
 }