The patch titled
Subject: lz4: fix wrong compress buffer size for 64-bits
has been added to the -mm tree. Its filename is
lz4-fix-wrong-compress-buffer-size-for-64-bits.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/lz4-fix-wrong-compress-buffer-size-for-64-bits.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/lz4-fix-wrong-compress-buffer-size-for-64-bits.patch
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------------------------------------------------------
From: Bongkyu Kim <bongkyu.kim@xxxxxxx>
Subject: lz4: fix wrong compress buffer size for 64-bits
The current lz4 compress buffer is 16kb on 32-bits, 32kb on 64-bits
system. But, lz4 needs only 16kb on both. On 64-bits, this causes wasted
cpu cycles for additional memset during every compression.
In case of lz4hc,
the current buffer size is (256kb + 8) on 32-bits, (512kb + 16) on 64-bits.
But, lz4hc needs only (256kb + 2 * pointer) on both.
This patch fixes these wrong compress buffer sizes for 64-bits.
Signed-off-by: Bongkyu Kim <bongkyu.kim@xxxxxxx>
Cc: Chanho Min <chanho.min@xxxxxxx>
Cc: Yann Collet <yann.collet.73@xxxxxxxxx>
Cc: Kyungsik Lee <kyungsik.lee@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/lz4.h | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN include/linux/lz4.h~lz4-fix-wrong-compress-buffer-size-for-64-bits include/linux/lz4.h
--- a/include/linux/lz4.h~lz4-fix-wrong-compress-buffer-size-for-64-bits
+++ a/include/linux/lz4.h
@@ -9,8 +9,8 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
-#define LZ4_MEM_COMPRESS (4096 * sizeof(unsigned char *))
-#define LZ4HC_MEM_COMPRESS (65538 * sizeof(unsigned char *))
+#define LZ4_MEM_COMPRESS (16384)
+#define LZ4HC_MEM_COMPRESS (262144 + (2 * sizeof(unsigned char *)))
/*
* lz4_compressbound()
_
Patches currently in -mm which might be from bongkyu.kim@xxxxxxx are
lz4-fix-wrong-compress-buffer-size-for-64-bits.patch
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