diff --git a/README.md b/README.md
index 1ac7efbdd7..b521f73d52 100755
--- a/README.md
+++ b/README.md
@@ -242,6 +242,7 @@ Supported operating systems and hardware:
 * 2013-10-17, Created.<br/>
 
 ## History
+* v2.0, 2014-11-08, fix [#194](https://github.com/winlinvip/simple-rtmp-server/issues/194), writev multiple msgs, support 6k+ 250kbps clients. 2.0.15.
 * v2.0, 2014-11-08, fix [#194](https://github.com/winlinvip/simple-rtmp-server/issues/194), optmized st for timeout recv. pulse to 500ms. 2.0.14.
 * v2.0, 2014-11-08, fix [#195](https://github.com/winlinvip/simple-rtmp-server/issues/195), remove the confuse code st_usleep(0). 2.0.13.
 * v2.0, 2014-11-08, fix [#191](https://github.com/winlinvip/simple-rtmp-server/issues/191), configure --export-librtmp-project and --export-librtmp-single. 2.0.11.
@@ -449,6 +450,7 @@ Performance benchmark history, on virtual box:
 * 2014-11-11, SRS 1.0.5,   2700clients, 85%CPU, 66MB. (1.0 equals 2.0.12)
 * 2014-11-12, SRS 2.0.14,  2700clients, 69%CPU, 59MB.
 * 2014-11-12, SRS 2.0.14,  3500clients, 95%CPU, 78MB.
+* 2014-11-13, SRS 2.0.15,  6000clients, 82%CPU, 203MB.
 
 Latest benchmark(2014-07-12):
 
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index e9bcf5f94d..acd302059e 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -525,10 +525,7 @@ int SrsRtmpConn::playing(SrsSource* source)
     int64_t starttime = -1;
     
     while (true) {
-        // collect elapse for pithy print.
-        pithy_print.elapse();
-
-        // to use isolate thread to recv, can improve about 5% performance.
+        // TODO: to use isolate thread to recv, can improve about 5% performance.
         // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196
         // read from client.
         if (true) {
@@ -539,6 +536,7 @@ int SrsRtmpConn::playing(SrsSource* source)
             if (ret == ERROR_SOCKET_TIMEOUT) {
                 // it's ok, do nothing.
                 ret = ERROR_SUCCESS;
+                srs_verbose("recv timeout, ignore. ret=%d", ret);
             } else if (ret != ERROR_SUCCESS) {
                 if (!srs_is_client_gracefully_close(ret)) {
                     srs_error("recv client control message failed. ret=%d", ret);
@@ -554,6 +552,9 @@ int SrsRtmpConn::playing(SrsSource* source)
             }
         }
         
+        // collect elapse for pithy print.
+        pithy_print.elapse();
+        
         // get messages from consumer.
         int count = 0;
         if ((ret = consumer->dump_packets(msgs.size, msgs.msgs, count)) != ERROR_SUCCESS) {
@@ -568,22 +569,16 @@ int SrsRtmpConn::playing(SrsSource* source)
                 " time=%"PRId64", msgs=%d, okbps=%d,%d,%d, ikbps=%d,%d,%d", 
                 pithy_print.age(), count,
                 kbps->get_send_kbps(), kbps->get_send_kbps_30s(), kbps->get_send_kbps_5m(),
-                kbps->get_recv_kbps(), kbps->get_recv_kbps_30s(), kbps->get_recv_kbps_5m());
+                kbps->get_recv_kbps(), kbps->get_recv_kbps_30s(), kbps->get_recv_kbps_5m()
+            );
         }
         
-        // sendout messages
-        // @remark, becareful, all msgs must be free explicitly,
-        //      free by send_and_free_message or srs_freep.
-        for (int i = 0; i < count; i++) {
-            SrsSharedPtrMessage* msg = msgs.msgs[i];
-            
-            // the send_message will free the msg, 
-            // so set the msgs[i] to NULL.
-            msgs.msgs[i] = NULL;
-            
-            // only when user specifies the duration, 
-            // we start to collect the durations for each message.
-            if (user_specified_duration_to_stop) {
+        // only when user specifies the duration, 
+        // we start to collect the durations for each message.
+        if (user_specified_duration_to_stop) {
+            for (int i = 0; i < count; i++) {
+                SrsSharedPtrMessage* msg = msgs.msgs[i];
+                
                 // foreach msg, collect the duration.
                 // @remark: never use msg when sent it, for the protocol sdk will free it.
                 if (starttime < 0 || starttime > msg->header.timestamp) {
@@ -592,12 +587,23 @@ int SrsRtmpConn::playing(SrsSource* source)
                 duration += msg->header.timestamp - starttime;
                 starttime = msg->header.timestamp;
             }
-            
+        }
+        
+        // sendout messages
+        // @remark, becareful, all msgs must be free explicitly,
+        //      free by send_and_free_message or srs_freep.
+        if (count > 0) {
             // no need to assert msg, for the rtmp will assert it.
-            if ((ret = rtmp->send_and_free_message(msg, res->stream_id)) != ERROR_SUCCESS) {
-                srs_error("send message to client failed. ret=%d", ret);
-                return ret;
-            }
+            ret = rtmp->send_and_free_messages(msgs.msgs, count, res->stream_id);
+        }
+        for (int i = 0; i < count; i++) {
+            // the send_message will free the msg, 
+            // so set the msgs[i] to NULL.
+            msgs.msgs[i] = NULL;
+        }
+        if (ret != ERROR_SUCCESS) {
+            srs_error("send messages to client failed. ret=%d", ret);
+            return ret;
         }
         
         // if duration specified, and exceed it, stop play live.
diff --git a/trunk/src/core/srs_core.hpp b/trunk/src/core/srs_core.hpp
index 9d6dbc9e12..78625cbf74 100644
--- a/trunk/src/core/srs_core.hpp
+++ b/trunk/src/core/srs_core.hpp
@@ -31,7 +31,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // current release version
 #define VERSION_MAJOR       2
 #define VERSION_MINOR       0
-#define VERSION_REVISION    14
+#define VERSION_REVISION    15
 // server info.
 #define RTMP_SIG_SRS_KEY "SRS"
 #define RTMP_SIG_SRS_ROLE "origin/edge server"
diff --git a/trunk/src/kernel/srs_kernel_consts.hpp b/trunk/src/kernel/srs_kernel_consts.hpp
index defc2d556c..4bb5513116 100644
--- a/trunk/src/kernel/srs_kernel_consts.hpp
+++ b/trunk/src/kernel/srs_kernel_consts.hpp
@@ -97,6 +97,19 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 // always use fmt0 as cache.
 //#define SRS_CONSTS_RTMP_MAX_FMT3_HEADER_SIZE 5
 
+/**
+* for performance issue, 
+* the iovs cache, @see https://github.com/winlinvip/simple-rtmp-server/issues/194
+* iovs cache for multiple messages for each connections.
+*/
+#define SRS_CONSTS_IOVS_MAX 1024
+/**
+* for performance issue, 
+* the c0c3 cache, @see https://github.com/winlinvip/simple-rtmp-server/issues/194
+* c0c3 cache for multiple messages for each connections.
+*/
+#define SRS_CONSTS_C0C3_HEADERS_MAX 4096
+
 ///////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////
 ///////////////////////////////////////////////////////////
diff --git a/trunk/src/rtmp/srs_protocol_rtmp.cpp b/trunk/src/rtmp/srs_protocol_rtmp.cpp
index 304b59a788..76a0b2cb18 100644
--- a/trunk/src/rtmp/srs_protocol_rtmp.cpp
+++ b/trunk/src/rtmp/srs_protocol_rtmp.cpp
@@ -771,6 +771,11 @@ int SrsRtmpServer::send_and_free_message(SrsMessage* msg, int stream_id)
     return protocol->send_and_free_message(msg, stream_id);
 }
 
+int SrsRtmpServer::send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, int stream_id)
+{
+    return protocol->send_and_free_messages(msgs, nb_msgs, stream_id);
+}
+
 int SrsRtmpServer::send_and_free_packet(SrsPacket* packet, int stream_id)
 {
     return protocol->send_and_free_packet(packet, stream_id);
diff --git a/trunk/src/rtmp/srs_protocol_rtmp.hpp b/trunk/src/rtmp/srs_protocol_rtmp.hpp
index fcf224f306..e6dcb0b513 100644
--- a/trunk/src/rtmp/srs_protocol_rtmp.hpp
+++ b/trunk/src/rtmp/srs_protocol_rtmp.hpp
@@ -368,6 +368,15 @@ class SrsRtmpServer
     */
     virtual int send_and_free_message(SrsMessage* msg, int stream_id);
     /**
+    * send the RTMP message and always free it.
+    * user must never free or use the msg after this method,
+    * for it will always free the msg.
+    * @param msgs, the msgs to send out, never be NULL.
+    * @param nb_msgs, the size of msgs to send out.
+    * @param stream_id, the stream id of packet to send over, 0 for control message.
+    */
+    virtual int send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, int stream_id);
+    /**
     * send the RTMP packet and always free it.
     * user must never free or use the packet after this method,
     * for it will always free the packet.
diff --git a/trunk/src/rtmp/srs_protocol_stack.cpp b/trunk/src/rtmp/srs_protocol_stack.cpp
index 47255cd86e..8f2bb11a2e 100644
--- a/trunk/src/rtmp/srs_protocol_stack.cpp
+++ b/trunk/src/rtmp/srs_protocol_stack.cpp
@@ -29,6 +29,7 @@ CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <srs_core_autofree.hpp>
 #include <srs_kernel_utility.hpp>
 
+#include <stdlib.h>
 using namespace std;
 
 // when got a messae header, there must be some data,
@@ -404,7 +405,15 @@ SrsProtocol::SrsProtocol(ISrsProtocolReaderWriter* io)
     in_buffer = new SrsBuffer();
     skt = io;
     
-    in_chunk_size = out_chunk_size = SRS_CONSTS_RTMP_PROTOCOL_CHUNK_SIZE;
+    in_chunk_size = SRS_CONSTS_RTMP_PROTOCOL_CHUNK_SIZE;
+    out_chunk_size = SRS_CONSTS_RTMP_PROTOCOL_CHUNK_SIZE;
+    
+    nb_out_iovs = SRS_CONSTS_IOVS_MAX;
+    out_iovs = (iovec*)malloc(sizeof(iovec) * nb_out_iovs);
+    // each chunk consumers atleast 2 iovs
+    srs_assert(nb_out_iovs >= 2);
+    
+    warned_c0c3_caches = false;
 }
 
 SrsProtocol::~SrsProtocol()
@@ -421,6 +430,12 @@ SrsProtocol::~SrsProtocol()
     }
     
     srs_freep(in_buffer);
+    
+    // alloc by malloc, use free directly.
+    if (out_iovs) {
+        free(out_iovs);
+        out_iovs = NULL;
+    }
 }
 
 void SrsProtocol::set_recv_timeout(int64_t timeout_us)
@@ -560,7 +575,7 @@ int SrsProtocol::do_send_message(SrsMessage* msg)
         // always has header
         int nbh = 0;
         char* header = NULL;
-        generate_chunk_header(&msg->header, p == msg->payload, &nbh, &header);
+        generate_chunk_header(out_c0c3_cache, &msg->header, p == msg->payload, &nbh, &header);
         srs_assert(nbh > 0);
         
         // header iov
@@ -590,10 +605,130 @@ int SrsProtocol::do_send_message(SrsMessage* msg)
     return ret;
 }
 
-void SrsProtocol::generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh, char** ph) 
+int SrsProtocol::do_send_messages(SrsSharedPtrMessage** msgs, int nb_msgs)
 {
-    char* cache = out_c0c3_cache;
+    int ret = ERROR_SUCCESS;
+    
+    // TODO: FIXME: use cache system instead.
+    int iov_index = 0;
+    iovec* iov = out_iovs + iov_index;
+    
+    int c0c3_cache_index = 0;
+    char* c0c3_cache = out_c0c3_caches + c0c3_cache_index;
+
+    // try to send use the c0c3 header cache,
+    // if cache is consumed, try another loop.
+    for (int i = 0; i < nb_msgs; i++) {
+        SrsMessage* msg = msgs[i];
+    
+        // ignore empty message.
+        if (!msg->payload || msg->size <= 0) {
+            srs_info("ignore empty message.");
+            continue;
+        }
+        
+        // we donot use the complex basic header,
+        // ensure the basic header is 1bytes.
+        if (msg->header.perfer_cid < 2) {
+            srs_warn("change the chunk_id=%d to default=%d", 
+                msg->header.perfer_cid, RTMP_CID_ProtocolControl);
+            msg->header.perfer_cid = RTMP_CID_ProtocolControl;
+        }
+    
+        // p set to current write position,
+        // it's ok when payload is NULL and size is 0.
+        char* p = msg->payload;
+        char* pend = msg->payload + msg->size;
+        
+        // always write the header event payload is empty.
+        while (p < pend) {
+            // always has header
+            int nbh = 0;
+            char* header = NULL;
+            generate_chunk_header(c0c3_cache, &msg->header, p == msg->payload, &nbh, &header);
+            srs_assert(nbh > 0);
+            
+            // header iov
+            iov[0].iov_base = header;
+            iov[0].iov_len = nbh;
+            
+            // payload iov
+            int payload_size = pend - p;
+            if (payload_size > out_chunk_size) {
+                payload_size = out_chunk_size;
+            }
+            iov[1].iov_base = p;
+            iov[1].iov_len = payload_size;
+            
+            // consume sendout bytes.
+            p += payload_size;
+            
+            // realloc the iovs if exceed,
+            // for we donot know how many messges maybe to send entirely,
+            // we just alloc the iovs, it's ok.
+            if (iov_index >= nb_out_iovs - 2) {
+                nb_out_iovs += SRS_CONSTS_IOVS_MAX;
+                int realloc_size = sizeof(iovec) * nb_out_iovs;
+                out_iovs = (iovec*)realloc(out_iovs, realloc_size);
+            }
+            
+            // to next pair of iovs
+            iov_index += 2;
+            iov = out_iovs + iov_index;
+
+            // to next c0c3 header cache
+            c0c3_cache_index += nbh;
+            c0c3_cache = out_c0c3_caches + c0c3_cache_index;
+            
+            // the cache header should never be realloc again,
+            // for the ptr is set to iovs, so we just warn user to set larger
+            // and use another loop to send again.
+            int c0c3_left = SRS_CONSTS_C0C3_HEADERS_MAX - c0c3_cache_index;
+            if (c0c3_left < SRS_CONSTS_RTMP_MAX_FMT0_HEADER_SIZE) {
+                // only warn once for a connection.
+                if (!warned_c0c3_caches) {
+                    srs_warn("c0c3 cache header too small, recoment to %d", 
+                        SRS_CONSTS_C0C3_HEADERS_MAX + SRS_CONSTS_RTMP_MAX_FMT0_HEADER_SIZE);
+                    warned_c0c3_caches = true;
+                }
+                
+                // when c0c3 cache dry,
+                // sendout all messages and reset the cache, then send again.
+                if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
+                    srs_error("send with writev failed. ret=%d", ret);
+                    return ret;
+                }
     
+                // reset caches, while these cache ensure 
+                // atleast we can sendout a chunk.
+                iov_index = 0;
+                iov = out_iovs + iov_index;
+                
+                c0c3_cache_index = 0;
+                c0c3_cache = out_c0c3_caches + c0c3_cache_index;
+            }
+        }
+    }
+    
+    // maybe the iovs already sendout when c0c3 cache dry,
+    // so just ignore when no iovs to send.
+    if (iov_index <= 0) {
+        return ret;
+    }
+    
+    // send by writev
+    // sendout header and payload by writev.
+    // decrease the sys invoke count to get higher performance.
+    if ((ret = skt->writev(out_iovs, iov_index, NULL)) != ERROR_SUCCESS) {
+        srs_error("send with writev failed. ret=%d", ret);
+        return ret;
+    }
+    
+    return ret;
+}
+
+void SrsProtocol::generate_chunk_header(char* cache, SrsMessageHeader* mh, bool c0, int* pnbh, char** ph) 
+{
     // to directly set the field.
     char* pp = NULL;
     
@@ -856,6 +991,34 @@ int SrsProtocol::send_and_free_message(SrsMessage* msg, int stream_id)
     return ret;
 }
 
+int SrsProtocol::send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, int stream_id)
+{
+    // always not NULL msg.
+    srs_assert(msgs);
+    srs_assert(nb_msgs > 0);
+    
+    // update the stream id in header.
+    for (int i = 0; i < nb_msgs; i++) {
+        SrsMessage* msg = msgs[i];
+        // we assume that the stream_id in a group must be the same.
+        if (msg->header.stream_id == stream_id) {
+            break;
+        }
+        msg->header.stream_id = stream_id;
+    }
+    
+    // donot use the auto free to free the msg,
+    // for performance issue.
+    int ret = do_send_messages(msgs, nb_msgs);
+    
+    for (int i = 0; i < nb_msgs; i++) {
+        SrsMessage* msg = msgs[i];
+        srs_freep(msg);
+    }
+    
+    return ret;
+}
+
 int SrsProtocol::send_and_free_packet(SrsPacket* packet, int stream_id)
 {
     int ret = ERROR_SUCCESS;
diff --git a/trunk/src/rtmp/srs_protocol_stack.hpp b/trunk/src/rtmp/srs_protocol_stack.hpp
index 071f5168f7..2f4914d9cc 100644
--- a/trunk/src/rtmp/srs_protocol_stack.hpp
+++ b/trunk/src/rtmp/srs_protocol_stack.hpp
@@ -47,6 +47,7 @@ class SrsAmf0Any;
 class SrsMessageHeader;
 class SrsMessage;
 class SrsChunkStream;
+class SrsSharedPtrMessage;
 
 /**
 * 4.1. Message Header
@@ -221,6 +222,15 @@ class SrsProtocol
     */
     iovec out_iov[2];
     /**
+    * cache for multiple messages send
+    */
+    iovec* out_iovs;
+    int nb_out_iovs;
+    // the c0c3 cache cannot be realloc.
+    char out_c0c3_caches[SRS_CONSTS_C0C3_HEADERS_MAX];
+    // whether warned user to increase the c0c3 header cache.
+    bool warned_c0c3_caches;
+    /**
     * output chunk size, default to 128, set by config.
     */
     int32_t out_chunk_size;
@@ -276,6 +286,15 @@ class SrsProtocol
     */
     virtual int send_and_free_message(SrsMessage* msg, int stream_id);
     /**
+    * send the RTMP message and always free it.
+    * user must never free or use the msg after this method,
+    * for it will always free the msg.
+    * @param msgs, the msgs to send out, never be NULL.
+    * @param nb_msgs, the size of msgs to send out.
+    * @param stream_id, the stream id of packet to send over, 0 for control message.
+    */
+    virtual int send_and_free_messages(SrsSharedPtrMessage** msgs, int nb_msgs, int stream_id);
+    /**
     * send the RTMP packet and always free it.
     * user must never free or use the packet after this method,
     * for it will always free the packet.
@@ -349,6 +368,11 @@ class SrsProtocol
     */
     virtual int do_send_message(SrsMessage* msg);
     /**
+    * send out the messages, donot free it, 
+    * the caller must free the param msgs.
+    */
+    virtual int do_send_messages(SrsSharedPtrMessage** msgs, int nb_msgs);
+    /**
     * generate the chunk header for msg.
     * @param mh, the header of msg to send.
     * @param c0, whether the first chunk, the c0 chunk.
@@ -356,7 +380,7 @@ class SrsProtocol
     * @param ph, output the header cache.
     *       user should never free it, it's cached header.
     */
-    virtual void generate_chunk_header(SrsMessageHeader* mh, bool c0, int* pnbh, char** ph);
+    virtual void generate_chunk_header(char* cache, SrsMessageHeader* mh, bool c0, int* pnbh, char** ph);
     /**
     * imp for decode_message
     */