UBIFS: slight compression optimization
If data does not compress, it is better to leave it uncompressed
because we'll read it faster then. So do not compress data if we
save less than 64 bytes.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
diff --git a/fs/ubifs/compress.c b/fs/ubifs/compress.c
index a0ada59..6414d50 100644
--- a/fs/ubifs/compress.c
+++ b/fs/ubifs/compress.c
@@ -119,10 +119,10 @@
}
/*
- * Presently, we just require that compression results in less data,
- * rather than any defined minimum compression ratio or amount.
+ * If the data compressed only slightly, it is better to leave it
+ * uncompressed to improve read speed.
*/
- if (ALIGN(*out_len, 8) >= ALIGN(in_len, 8))
+ if (in_len - *out_len < UBIFS_MIN_COMPRESS_DIFF)
goto no_compr;
return;