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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-10-26 16:58:25 +0200
committerArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2008-12-03 13:13:50 +0200
commit062e4fee4400f283307cf8ac1b7931c939010229 (patch)
treecacea4a2f65688ad02fa572060155783c4f0377c /fs/ubifs/ubifs-media.h
parentf6f7b52e2f6149d2ee365717afff315b05720162 (diff)
downloadop-kernel-dev-062e4fee4400f283307cf8ac1b7931c939010229.zip
op-kernel-dev-062e4fee4400f283307cf8ac1b7931c939010229.tar.gz
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>
Diffstat (limited to 'fs/ubifs/ubifs-media.h')
-rw-r--r--fs/ubifs/ubifs-media.h7
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ubifs/ubifs-media.h b/fs/ubifs/ubifs-media.h
index 0b37804..b25fc36 100644
--- a/fs/ubifs/ubifs-media.h
+++ b/fs/ubifs/ubifs-media.h
@@ -51,6 +51,13 @@
*/
#define UBIFS_MIN_COMPR_LEN 128
+/*
+ * If compressed data length is less than %UBIFS_MIN_COMPRESS_DIFF bytes
+ * shorter than uncompressed data length, UBIFS preferes to leave this data
+ * node uncompress, because it'll be read faster.
+ */
+#define UBIFS_MIN_COMPRESS_DIFF 64
+
/* Root inode number */
#define UBIFS_ROOT_INO 1
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