LZF compression re-enabled by default, but with INIT_HTAB set to 0 to avoid the very costly memset initialization. Note that with this option set valgrind will output some false positive about lzf_c.c

lzfP.h

@@ -88,7 +88,7 @@
  * deterministic/repeatable when the configuration otherwise is the same).
  */
 #ifndef INIT_HTAB
-# define INIT_HTAB 1
+# define INIT_HTAB 0
 #endif
 
 /*

redis.c

@@ -1142,7 +1142,7 @@ static void initServerConfig() {
     server.appendfilename = "appendonly.aof";
     server.requirepass = NULL;
     server.shareobjects = 0;
-    server.rdbcompression = 0;
+    server.rdbcompression = 1;
     server.sharingpoolsize = 1024;
     server.maxclients = 0;
     server.maxmemory = 0;

redis.conf

@@ -54,10 +54,10 @@ save 300 10
 save 60 10000
 
 # Compress string objects using LZF when dump .rdb databases?
-# For default that's set to 'no' because uses too much CPU time.
-# You want to switch this to 'yes' only if you have a lot of very compressible
-# data inside your dataset and are using replication.
-rdbcompression no
+# For default that's set to 'yes' as it's almost always a win.
+# If you want to save some CPU in the saving child set it to 'no' but
+# the dataset will likely be bigger if you have compressible values or keys.
+rdbcompression yes
 
 # The filename where to dump the DB
 dbfilename dump.rdb