From: Willy Tarreau <w@1wt.eu>
Date: Fri, 26 Oct 2012 09:36:40 +0000 (+0200)
Subject: MINOR: compression: optimize memLevel to improve byte rate
X-Git-Tag: v1.5-dev13~114
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=7e488d781ccfb5615d860dc348035cc25b184a79;p=thirdparty%2Fhaproxy.git

MINOR: compression: optimize memLevel to improve byte rate

Decreasing the deflateInit2's memLevel parameter from 9 to 8 does not
affect the compression ratio and increases the compression speed by 12%.
Lower values do not increase transfer speed but decrease the compression
ratio so it looks like 8 is optimal.
---

diff --git a/src/compression.c b/src/compression.c
index 87449acf12..45244a075d 100644
--- a/src/compression.c
+++ b/src/compression.c
@@ -317,7 +317,7 @@ int gzip_init(void *v, int level)
 	strm->zfree = Z_NULL;
 	strm->opaque = Z_NULL;
 
-	if (deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS + 16, 9, Z_DEFAULT_STRATEGY) != Z_OK)
+	if (deflateInit2(strm, level, Z_DEFLATED, MAX_WBITS + 16, 8, Z_DEFAULT_STRATEGY) != Z_OK)
 		return -1;
 
 	return 0;