Remove glueoutputbuf option and broken code

src/config.c

@@ -194,10 +194,8 @@ void loadServerConfig(char *filename) {
             if ((server.repl_serve_stale_data = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;
             }
-        } else if (!strcasecmp(argv[0],"glueoutputbuf") && argc == 2) {
+        } else if (!strcasecmp(argv[0],"glueoutputbuf")) {
-            if ((server.glueoutputbuf = yesnotoi(argv[1])) == -1) {
+            redisLog(REDIS_WARNING, "Deprecated configuration directive: \"%s\"", argv[0]);
-                err = "argument must be 'yes' or 'no'"; goto loaderr;
-            }
         } else if (!strcasecmp(argv[0],"rdbcompression") && argc == 2) {
             if ((server.rdbcompression = yesnotoi(argv[1])) == -1) {
                 err = "argument must be 'yes' or 'no'"; goto loaderr;

src/networking.c

@@ -515,15 +515,6 @@ void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
     REDIS_NOTUSED(el);
     REDIS_NOTUSED(mask);
 
-    /* Use writev() if we have enough buffers to send */
-    if (!server.glueoutputbuf &&
-        listLength(c->reply) > REDIS_WRITEV_THRESHOLD &&
-        !(c->flags & REDIS_MASTER))
-    {
-        sendReplyToClientWritev(el, fd, privdata, mask);
-        return;
-    }
-
     while(c->bufpos > 0 || listLength(c->reply)) {
         if (c->bufpos > 0) {
             if (c->flags & REDIS_MASTER) {
@@ -594,84 +585,6 @@ void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask) {
     }
 }
 
-void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask)
-{
-    redisClient *c = privdata;
-    int nwritten = 0, totwritten = 0, objlen, willwrite;
-    robj *o;
-    struct iovec iov[REDIS_WRITEV_IOVEC_COUNT];
-    int offset, ion = 0;
-    REDIS_NOTUSED(el);
-    REDIS_NOTUSED(mask);
-
-    listNode *node;
-    while (listLength(c->reply)) {
-        offset = c->sentlen;
-        ion = 0;
-        willwrite = 0;
-
-        /* fill-in the iov[] array */
-        for(node = listFirst(c->reply); node; node = listNextNode(node)) {
-            o = listNodeValue(node);
-            objlen = sdslen(o->ptr);
-
-            if (totwritten + objlen - offset > REDIS_MAX_WRITE_PER_EVENT)
-                break;
-
-            if(ion == REDIS_WRITEV_IOVEC_COUNT)
-                break; /* no more iovecs */
-
-            iov[ion].iov_base = ((char*)o->ptr) + offset;
-            iov[ion].iov_len = objlen - offset;
-            willwrite += objlen - offset;
-            offset = 0; /* just for the first item */
-            ion++;
-        }
-
-        if(willwrite == 0)
-            break;
-
-        /* write all collected blocks at once */
-        if((nwritten = writev(fd, iov, ion)) < 0) {
-            if (errno != EAGAIN) {
-                redisLog(REDIS_VERBOSE,
-                         "Error writing to client: %s", strerror(errno));
-                freeClient(c);
-                return;
-            }
-            break;
-        }
-
-        totwritten += nwritten;
-        offset = c->sentlen;
-
-        /* remove written robjs from c->reply */
-        while (nwritten && listLength(c->reply)) {
-            o = listNodeValue(listFirst(c->reply));
-            objlen = sdslen(o->ptr);
-
-            if(nwritten >= objlen - offset) {
-                listDelNode(c->reply, listFirst(c->reply));
-                nwritten -= objlen - offset;
-                c->sentlen = 0;
-            } else {
-                /* partial write */
-                c->sentlen += nwritten;
-                break;
-            }
-            offset = 0;
-        }
-    }
-
-    if (totwritten > 0)
-        c->lastinteraction = time(NULL);
-
-    if (listLength(c->reply) == 0) {
-        c->sentlen = 0;
-        aeDeleteFileEvent(server.el,c->fd,AE_WRITABLE);
-    }
-}
-
 /* resetClient prepare the client to process the next command */
 void resetClient(redisClient *c) {
     freeClientArgv(c);

src/redis.c

@@ -749,7 +749,6 @@ void initServerConfig() {
     server.syslog_enabled = 0;
     server.syslog_ident = zstrdup("redis");
     server.syslog_facility = LOG_LOCAL0;
-    server.glueoutputbuf = 1;
     server.daemonize = 0;
     server.appendonly = 0;
     server.appendfsync = APPENDFSYNC_EVERYSEC;

src/redis.h

@@ -50,11 +50,6 @@
 #define REDIS_REPLY_CHUNK_BYTES (5*1500) /* 5 TCP packets with default MTU */
 #define REDIS_MAX_LOGMSG_LEN    1024 /* Default maximum length of syslog messages */
 
-/* If more then REDIS_WRITEV_THRESHOLD write packets are pending use writev */
-#define REDIS_WRITEV_THRESHOLD      3
-/* Max number of iovecs used for each writev call */
-#define REDIS_WRITEV_IOVEC_COUNT    256
-
 /* Hash table parameters */
 #define REDIS_HT_MINFILL        10      /* Minimal hash table fill 10% */
 
@@ -384,7 +379,6 @@ struct redisServer {
     long long stat_keyspace_misses; /* number of failed lookups of keys */
     /* Configuration */
     int verbosity;
-    int glueoutputbuf;
     int maxidletime;
     int dbnum;
     int daemonize;
@@ -629,7 +623,6 @@ void closeTimedoutClients(void);
 void freeClient(redisClient *c);
 void resetClient(redisClient *c);
 void sendReplyToClient(aeEventLoop *el, int fd, void *privdata, int mask);
-void sendReplyToClientWritev(aeEventLoop *el, int fd, void *privdata, int mask);
 void addReply(redisClient *c, robj *obj);
 void *addDeferredMultiBulkLength(redisClient *c);
 void setDeferredMultiBulkLength(redisClient *c, void *node, long length);