Merge branch 'ns/raise-write-index-buffer-size'

Raise the buffer size used when writing the index file out from
(obviously too small) 8kB to (clearly sufficiently large) 128kB.

* ns/raise-write-index-buffer-size:
  read-cache: make the index write buffer size 128K

read-cache.c

@@ -2465,7 +2465,7 @@ int repo_index_has_changes(struct repository *repo,
 	}
 }
 
-#define WRITE_BUFFER_SIZE 8192
+#define WRITE_BUFFER_SIZE (128 * 1024)
 static unsigned char write_buffer[WRITE_BUFFER_SIZE];
 static unsigned long write_buffer_len;