From: Enzo Matsumiya <ematsumiya@suse.de>
To: linux-cifs@vger.kernel.org
Cc: smfrench@gmail.com, pc@manguebit.com, ronniesahlberg@gmail.com,
sprasad@microsoft.com, tom@talpey.com, bharathsm@microsoft.com,
henrique.carvalho@suse.com
Subject: [PATCH 4/8] smb: client: compress: increase LZ77_MATCH_MAX_DIST
Date: Mon, 13 Apr 2026 16:07:09 -0300 [thread overview]
Message-ID: <20260413190713.283939-4-ematsumiya@suse.de> (raw)
In-Reply-To: <20260413190713.283939-1-ematsumiya@suse.de>
Increase max distance (i.e. window size) from 1k to 8k.
This allows better compression and is just as fast.
Other:
- drop LZ77_MATCH_MIN_DIST as it's nused -- main loop
already checks if dist > 0
Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
---
fs/smb/client/compress/lz77.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/fs/smb/client/compress/lz77.c b/fs/smb/client/compress/lz77.c
index 61cdf1c14612..480927dcd4c6 100644
--- a/fs/smb/client/compress/lz77.c
+++ b/fs/smb/client/compress/lz77.c
@@ -17,8 +17,7 @@
* Compression parameters.
*/
#define LZ77_MATCH_MIN_LEN 4
-#define LZ77_MATCH_MIN_DIST 1
-#define LZ77_MATCH_MAX_DIST SZ_1K
+#define LZ77_MATCH_MAX_DIST SZ_8K
#define LZ77_HASH_LOG 15
#define LZ77_HASH_SIZE (1 << LZ77_HASH_LOG)
#define LZ77_STEP_SIZE sizeof(u64)
--
2.53.0
next prev parent reply other threads:[~2026-04-13 19:07 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-13 19:07 [PATCH 1/8] smb: client: compress: fix buffer overrun in lz77_compress() Enzo Matsumiya
2026-04-13 19:07 ` [PATCH 2/8] smb: client: compress: fix bad encoding on last LZ77 flag Enzo Matsumiya
2026-04-19 1:35 ` Steve French
2026-04-13 19:07 ` [PATCH 3/8] smb: client: compress: fix counting in LZ77 match finding Enzo Matsumiya
2026-04-13 19:07 ` Enzo Matsumiya [this message]
2026-04-13 19:07 ` [PATCH 5/8] smb: client: compress: LZ77 optimizations Enzo Matsumiya
2026-04-13 19:07 ` [PATCH 6/8] smb: client: compress: add code docs to lz77.c Enzo Matsumiya
2026-04-13 19:07 ` [PATCH 7/8] smb: client: compress: add compress/common.h Enzo Matsumiya
2026-04-20 21:24 ` Nathan Chancellor
2026-04-20 21:31 ` Steve French
2026-04-13 19:07 ` [PATCH 8/8] smb: common: add SMB3_COMPRESS_MAX_ALGS Enzo Matsumiya
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