hiredis/redis changes for speed with big payloads: read buffer size set

to 16k, request buffer size is no longer destroyed when emtpy and large
(better fix needed). Redis clients static output buffer set to 16k as
well.

deps/hiredis/hiredis.c

@@ -520,13 +520,14 @@ void redisReplyReaderFeed(void *reader, const char *buf, size_t len) {
 
     /* Copy the provided buffer. */
     if (buf != NULL && len >= 1) {
+#if 0
         /* Destroy internal buffer when it is empty and is quite large. */
         if (r->len == 0 && sdsavail(r->buf) > 16*1024) {
             sdsfree(r->buf);
             r->buf = sdsempty();
             r->pos = 0;
         }
-
+#endif
         r->buf = sdscatlen(r->buf,buf,len);
         r->len = sdslen(r->buf);
     }
@@ -901,7 +902,7 @@ static void __redisCreateReplyReader(redisContext *c) {
  * After this function is called, you may use redisContextReadReply to
  * see if there is a reply available. */
 int redisBufferRead(redisContext *c) {
-    char buf[2048];
+    char buf[1024*16];
     int nread = read(c->fd,buf,sizeof(buf));
     if (nread == -1) {
         if (errno == EAGAIN && !(c->flags & REDIS_BLOCK)) {

src/redis.h

@@ -49,7 +49,7 @@
 #define REDIS_MAX_WRITE_PER_EVENT (1024*64)
 #define REDIS_REQUEST_MAX_SIZE (1024*1024*256) /* max bytes in inline command */
 #define REDIS_SHARED_INTEGERS 10000
-#define REDIS_REPLY_CHUNK_BYTES (5*1500) /* 5 TCP packets with default MTU */
+#define REDIS_REPLY_CHUNK_BYTES (16*1024) /* 16k output buffer */
 #define REDIS_MAX_LOGMSG_LEN    1024 /* Default maximum length of syslog messages */
 #define REDIS_AUTO_AOFREWRITE_PERC  100
 #define REDIS_AUTO_AOFREWRITE_MIN_SIZE (1024*1024)