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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/compress.c
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/compress.c')
-rw-r--r--fs/ubifs/compress.c6
1 files changed, 3 insertions, 3 deletions
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 @@ void ubifs_compress(const void *in_buf, int in_len, void *out_buf, int *out_len,
}
/*
- * 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;
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