diff --git a/trunk/src/app/srs_app_conn.cpp b/trunk/src/app/srs_app_conn.cpp
index b32151f80..b62419832 100644
--- a/trunk/src/app/srs_app_conn.cpp
+++ b/trunk/src/app/srs_app_conn.cpp
@@ -330,77 +330,47 @@ ISrsStartableConneciton::~ISrsStartableConneciton()
 {
 }
 
-SrsTcpConnection::SrsTcpConnection(ISrsResourceManager* cm, srs_netfd_t c, string cip, int cport)
+SrsTcpConnection::SrsTcpConnection(srs_netfd_t c)
 {
-    manager = cm;
     stfd = c;
-    ip = cip;
-    port = cport;
-    create_time = srsu2ms(srs_get_system_time());
-
     skt = new SrsStSocket();
-    clk = new SrsWallClock();
-    kbps = new SrsKbps(clk);
-    kbps->set_io(skt, skt);
-    
-    trd = new SrsSTCoroutine("conn", this);
 }
 
 SrsTcpConnection::~SrsTcpConnection()
 {
-    dispose();
-    
-    srs_freep(kbps);
-    srs_freep(clk);
     srs_freep(skt);
-    srs_freep(trd);
-    
     srs_close_stfd(stfd);
 }
 
-void SrsTcpConnection::remark(int64_t* in, int64_t* out)
-{
-    kbps->remark(in, out);
-}
-
-void SrsTcpConnection::dispose()
-{
-    trd->interrupt();
-}
-
-srs_error_t SrsTcpConnection::start()
+srs_error_t SrsTcpConnection::initialize()
 {
     srs_error_t err = srs_success;
-    
+
     if ((err = skt->initialize(stfd)) != srs_success) {
         return srs_error_wrap(err, "init socket");
     }
-    
-    if ((err = trd->start()) != srs_success) {
-        return srs_error_wrap(err, "coroutine");
-    }
-    
+
     return err;
 }
 
 srs_error_t SrsTcpConnection::set_tcp_nodelay(bool v)
 {
     srs_error_t err = srs_success;
-    
+
     int r0 = 0;
     socklen_t nb_v = sizeof(int);
     int fd = srs_netfd_fileno(stfd);
-    
+
     int ov = 0;
     if ((r0 = getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &ov, &nb_v)) != 0) {
         return srs_error_new(ERROR_SOCKET_NO_NODELAY, "getsockopt fd=%d, r0=%d", fd, r0);
     }
-    
+
 #ifndef SRS_PERF_TCP_NODELAY
     srs_warn("ignore TCP_NODELAY, fd=%d, ov=%d", fd, ov);
     return err;
 #endif
-    
+
     int iv = (v? 1:0);
     if ((r0 = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &iv, nb_v)) != 0) {
         return srs_error_new(ERROR_SOCKET_NO_NODELAY, "setsockopt fd=%d, r0=%d", fd, r0);
@@ -408,168 +378,13 @@ srs_error_t SrsTcpConnection::set_tcp_nodelay(bool v)
     if ((r0 = getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &iv, &nb_v)) != 0) {
         return srs_error_new(ERROR_SOCKET_NO_NODELAY, "getsockopt fd=%d, r0=%d", fd, r0);
     }
-    
+
     srs_trace("set fd=%d TCP_NODELAY %d=>%d", fd, ov, iv);
-    
+
     return err;
 }
 
 srs_error_t SrsTcpConnection::set_socket_buffer(srs_utime_t buffer_v)
-{
-    srs_error_t err = srs_success;
-    
-    int r0 = 0;
-    int fd = srs_netfd_fileno(stfd);
-    socklen_t nb_v = sizeof(int);
-    
-    int ov = 0;
-    if ((r0 = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &ov, &nb_v)) != 0) {
-        return srs_error_new(ERROR_SOCKET_SNDBUF, "getsockopt fd=%d, r0=%d", fd, r0);
-    }
-    
-#ifndef SRS_PERF_MW_SO_SNDBUF
-    srs_warn("ignore SO_SNDBUF, fd=%d, ov=%d", fd, ov);
-    return err;
-#endif
-    
-    // the bytes:
-    //      4KB=4096, 8KB=8192, 16KB=16384, 32KB=32768, 64KB=65536,
-    //      128KB=131072, 256KB=262144, 512KB=524288
-    // the buffer should set to sleep*kbps/8,
-    // for example, your system delivery stream in 1000kbps,
-    // sleep 800ms for small bytes, the buffer should set to:
-    //      800*1000/8=100000B(about 128KB).
-    // other examples:
-    //      2000*3000/8=750000B(about 732KB).
-    //      2000*5000/8=1250000B(about 1220KB).
-    int kbps = 4000;
-    int iv = srsu2ms(buffer_v) * kbps / 8;
-    
-    // socket send buffer, system will double it.
-    iv = iv / 2;
-    
-    // override the send buffer by macro.
-#ifdef SRS_PERF_SO_SNDBUF_SIZE
-    iv = SRS_PERF_SO_SNDBUF_SIZE / 2;
-#endif
-    
-    // set the socket send buffer when required larger buffer
-    if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &iv, nb_v) < 0) {
-        return srs_error_new(ERROR_SOCKET_SNDBUF, "setsockopt fd=%d, r0=%d", fd, r0);
-    }
-    if ((r0 = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &iv, &nb_v)) != 0) {
-        return srs_error_new(ERROR_SOCKET_SNDBUF, "getsockopt fd=%d, r0=%d", fd, r0);
-    }
-    
-    srs_trace("set fd=%d, SO_SNDBUF=%d=>%d, buffer=%dms", fd, ov, iv, srsu2ms(buffer_v));
-    
-    return err;
-}
-
-srs_error_t SrsTcpConnection::cycle()
-{
-    srs_error_t err = do_cycle();
-    
-    // Notify manager to remove it.
-    manager->remove(this);
-    
-    // success.
-    if (err == srs_success) {
-        srs_trace("client finished.");
-        return err;
-    }
-
-    // It maybe success with message.
-    if (srs_error_code(err) == ERROR_SUCCESS) {
-        srs_trace("client finished%s.", srs_error_summary(err).c_str());
-        srs_freep(err);
-        return err;
-    }
-    
-    // client close peer.
-    // TODO: FIXME: Only reset the error when client closed it.
-    if (srs_is_client_gracefully_close(err)) {
-        srs_warn("client disconnect peer. ret=%d", srs_error_code(err));
-    } else if (srs_is_server_gracefully_close(err)) {
-        srs_warn("server disconnect. ret=%d", srs_error_code(err));
-    } else {
-        srs_error("serve error %s", srs_error_desc(err).c_str());
-    }
-    
-    srs_freep(err);
-    return srs_success;
-}
-
-string SrsTcpConnection::remote_ip()
-{
-    return ip;
-}
-
-const SrsContextId& SrsTcpConnection::get_id()
-{
-    return trd->cid();
-}
-
-void SrsTcpConnection::expire()
-{
-    trd->interrupt();
-}
-
-SrsTcpConnection2::SrsTcpConnection2(srs_netfd_t c)
-{
-    stfd = c;
-    skt = new SrsStSocket();
-}
-
-SrsTcpConnection2::~SrsTcpConnection2()
-{
-    srs_freep(skt);
-    srs_close_stfd(stfd);
-}
-
-srs_error_t SrsTcpConnection2::initialize()
-{
-    srs_error_t err = srs_success;
-
-    if ((err = skt->initialize(stfd)) != srs_success) {
-        return srs_error_wrap(err, "init socket");
-    }
-
-    return err;
-}
-
-srs_error_t SrsTcpConnection2::set_tcp_nodelay(bool v)
-{
-    srs_error_t err = srs_success;
-
-    int r0 = 0;
-    socklen_t nb_v = sizeof(int);
-    int fd = srs_netfd_fileno(stfd);
-
-    int ov = 0;
-    if ((r0 = getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &ov, &nb_v)) != 0) {
-        return srs_error_new(ERROR_SOCKET_NO_NODELAY, "getsockopt fd=%d, r0=%d", fd, r0);
-    }
-
-#ifndef SRS_PERF_TCP_NODELAY
-    srs_warn("ignore TCP_NODELAY, fd=%d, ov=%d", fd, ov);
-    return err;
-#endif
-
-    int iv = (v? 1:0);
-    if ((r0 = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &iv, nb_v)) != 0) {
-        return srs_error_new(ERROR_SOCKET_NO_NODELAY, "setsockopt fd=%d, r0=%d", fd, r0);
-    }
-    if ((r0 = getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &iv, &nb_v)) != 0) {
-        return srs_error_new(ERROR_SOCKET_NO_NODELAY, "getsockopt fd=%d, r0=%d", fd, r0);
-    }
-
-    srs_trace("set fd=%d TCP_NODELAY %d=>%d", fd, ov, iv);
-
-    return err;
-}
-
-srs_error_t SrsTcpConnection2::set_socket_buffer(srs_utime_t buffer_v)
 {
     srs_error_t err = srs_success;
 
@@ -621,52 +436,52 @@ srs_error_t SrsTcpConnection2::set_socket_buffer(srs_utime_t buffer_v)
     return err;
 }
 
-void SrsTcpConnection2::set_recv_timeout(srs_utime_t tm)
+void SrsTcpConnection::set_recv_timeout(srs_utime_t tm)
 {
     skt->set_recv_timeout(tm);
 }
 
-srs_utime_t SrsTcpConnection2::get_recv_timeout()
+srs_utime_t SrsTcpConnection::get_recv_timeout()
 {
     return skt->get_recv_timeout();
 }
 
-srs_error_t SrsTcpConnection2::read_fully(void* buf, size_t size, ssize_t* nread)
+srs_error_t SrsTcpConnection::read_fully(void* buf, size_t size, ssize_t* nread)
 {
     return skt->read_fully(buf, size, nread);
 }
 
-int64_t SrsTcpConnection2::get_recv_bytes()
+int64_t SrsTcpConnection::get_recv_bytes()
 {
     return skt->get_recv_bytes();
 }
 
-int64_t SrsTcpConnection2::get_send_bytes()
+int64_t SrsTcpConnection::get_send_bytes()
 {
     return skt->get_send_bytes();
 }
 
-srs_error_t SrsTcpConnection2::read(void* buf, size_t size, ssize_t* nread)
+srs_error_t SrsTcpConnection::read(void* buf, size_t size, ssize_t* nread)
 {
     return skt->read(buf, size, nread);
 }
 
-void SrsTcpConnection2::set_send_timeout(srs_utime_t tm)
+void SrsTcpConnection::set_send_timeout(srs_utime_t tm)
 {
     skt->set_send_timeout(tm);
 }
 
-srs_utime_t SrsTcpConnection2::get_send_timeout()
+srs_utime_t SrsTcpConnection::get_send_timeout()
 {
     return skt->get_send_timeout();
 }
 
-srs_error_t SrsTcpConnection2::write(void* buf, size_t size, ssize_t* nwrite)
+srs_error_t SrsTcpConnection::write(void* buf, size_t size, ssize_t* nwrite)
 {
     return skt->write(buf, size, nwrite);
 }
 
-srs_error_t SrsTcpConnection2::writev(const iovec *iov, int iov_size, ssize_t* nwrite)
+srs_error_t SrsTcpConnection::writev(const iovec *iov, int iov_size, ssize_t* nwrite)
 {
     return skt->writev(iov, iov_size, nwrite);
 }
diff --git a/trunk/src/app/srs_app_conn.hpp b/trunk/src/app/srs_app_conn.hpp
index ac0619fad..a338046ed 100644
--- a/trunk/src/app/srs_app_conn.hpp
+++ b/trunk/src/app/srs_app_conn.hpp
@@ -130,77 +130,7 @@ public:
 // The basic connection of SRS, for TCP based protocols,
 // all connections accept from listener must extends from this base class,
 // server will add the connection to manager, and delete it when remove.
-class SrsTcpConnection : virtual public ISrsStartableConneciton
-    , virtual public ISrsReloadHandler, virtual public ISrsCoroutineHandler, virtual public ISrsExpire
-{
-protected:
-    // Each connection start a green thread,
-    // when thread stop, the connection will be delete by server.
-    SrsCoroutine* trd;
-    // The manager object to manage the connection.
-    ISrsResourceManager* manager;
-    // The underlayer st fd handler.
-    srs_netfd_t stfd;
-    // The ip and port of client.
-    std::string ip;
-    int port;
-    // The underlayer socket.
-    SrsStSocket* skt;
-    // The connection total kbps.
-    // not only the rtmp or http connection, all type of connection are
-    // need to statistic the kbps of io.
-    // The SrsStatistic will use it indirectly to statistic the bytes delta of current connection.
-    SrsKbps* kbps;
-    SrsWallClock* clk;
-    // The create time in milliseconds.
-    // for current connection to log self create time and calculate the living time.
-    int64_t create_time;
-public:
-    SrsTcpConnection(ISrsResourceManager* cm, srs_netfd_t c, std::string cip, int cport);
-    virtual ~SrsTcpConnection();
-// Interface ISrsKbpsDelta
-public:
-    virtual void remark(int64_t* in, int64_t* out);
-public:
-    // To dipose the connection.
-    virtual void dispose();
-// Interface ISrsStartable
-public:
-    // Start the client green thread.
-    // when server get a client from listener,
-    // 1. server will create an concrete connection(for instance, RTMP connection),
-    // 2. then add connection to its connection manager,
-    // 3. start the client thread by invoke this start()
-    // when client cycle thread stop, invoke the on_thread_stop(), which will use server
-    // To remove the client by server->remove(this).
-    virtual srs_error_t start();
-public:
-    // Set socket option TCP_NODELAY.
-    virtual srs_error_t set_tcp_nodelay(bool v);
-    // Set socket option SO_SNDBUF in srs_utime_t.
-    virtual srs_error_t set_socket_buffer(srs_utime_t buffer_v);
-// Interface ISrsOneCycleThreadHandler
-public:
-    // The thread cycle function,
-    // when serve connection completed, terminate the loop which will terminate the thread,
-    // thread will invoke the on_thread_stop() when it terminated.
-    virtual srs_error_t cycle();
-// Interface ISrsConnection.
-public:
-    virtual std::string remote_ip();
-    virtual const SrsContextId& get_id();
-public:
-    // Set connection to expired.
-    virtual void expire();
-protected:
-    // For concrete connection to do the cycle.
-    virtual srs_error_t do_cycle() = 0;
-};
-
-// The basic connection of SRS, for TCP based protocols,
-// all connections accept from listener must extends from this base class,
-// server will add the connection to manager, and delete it when remove.
-class SrsTcpConnection2 : virtual public ISrsProtocolReadWriter
+class SrsTcpConnection : virtual public ISrsProtocolReadWriter
 {
 private:
     // The underlayer st fd handler.
@@ -208,8 +138,8 @@ private:
     // The underlayer socket.
     SrsStSocket* skt;
 public:
-    SrsTcpConnection2(srs_netfd_t c);
-    virtual ~SrsTcpConnection2();
+    SrsTcpConnection(srs_netfd_t c);
+    virtual ~SrsTcpConnection();
 public:
     virtual srs_error_t initialize();
 public:
diff --git a/trunk/src/app/srs_app_http_api.cpp b/trunk/src/app/srs_app_http_api.cpp
index 7bea05f90..c7f9ce21e 100644
--- a/trunk/src/app/srs_app_http_api.cpp
+++ b/trunk/src/app/srs_app_http_api.cpp
@@ -1680,7 +1680,7 @@ SrsHttpApi::SrsHttpApi(ISrsResourceManager* cm, srs_netfd_t fd, SrsHttpServeMux*
     cors = new SrsHttpCorsMux();
     parser = new SrsHttpParser();
 
-    skt = new SrsTcpConnection2(fd);
+    skt = new SrsTcpConnection(fd);
     manager = cm;
     ip = cip;
     port = cport;
diff --git a/trunk/src/app/srs_app_http_api.hpp b/trunk/src/app/srs_app_http_api.hpp
index ae4cb63d2..f4cf06670 100644
--- a/trunk/src/app/srs_app_http_api.hpp
+++ b/trunk/src/app/srs_app_http_api.hpp
@@ -263,7 +263,7 @@ private:
     SrsHttpCorsMux* cors;
     SrsHttpServeMux* mux;
 private:
-    SrsTcpConnection2* skt;
+    SrsTcpConnection* skt;
     // Each connection start a green thread,
     // when thread stop, the connection will be delete by server.
     SrsCoroutine* trd;
diff --git a/trunk/src/app/srs_app_http_conn.cpp b/trunk/src/app/srs_app_http_conn.cpp
index d2161ed8c..978e42973 100644
--- a/trunk/src/app/srs_app_http_conn.cpp
+++ b/trunk/src/app/srs_app_http_conn.cpp
@@ -65,7 +65,7 @@ SrsHttpConn::SrsHttpConn(ISrsResourceManager* cm, srs_netfd_t fd, ISrsHttpServeM
     cors = new SrsHttpCorsMux();
     http_mux = m;
 
-    skt = new SrsTcpConnection2(fd);
+    skt = new SrsTcpConnection(fd);
     manager = cm;
     ip = cip;
     port = cport;
diff --git a/trunk/src/app/srs_app_http_conn.hpp b/trunk/src/app/srs_app_http_conn.hpp
index 234db8027..d86593d33 100644
--- a/trunk/src/app/srs_app_http_conn.hpp
+++ b/trunk/src/app/srs_app_http_conn.hpp
@@ -63,7 +63,7 @@ protected:
     ISrsHttpServeMux* http_mux;
     SrsHttpCorsMux* cors;
 protected:
-    SrsTcpConnection2* skt;
+    SrsTcpConnection* skt;
     // Each connection start a green thread,
     // when thread stop, the connection will be delete by server.
     SrsCoroutine* trd;
diff --git a/trunk/src/app/srs_app_rtc_source.hpp b/trunk/src/app/srs_app_rtc_source.hpp
index 7a2f126c5..6eaf89c2b 100644
--- a/trunk/src/app/srs_app_rtc_source.hpp
+++ b/trunk/src/app/srs_app_rtc_source.hpp
@@ -38,7 +38,6 @@
 #include <srs_app_source.hpp>
 
 class SrsRequest;
-class SrsTcpConnection;
 class SrsMetaCache;
 class SrsSharedPtrMessage;
 class SrsCommonMessage;
diff --git a/trunk/src/app/srs_app_rtmp_conn.cpp b/trunk/src/app/srs_app_rtmp_conn.cpp
index b487b2d59..8a8a00c31 100644
--- a/trunk/src/app/srs_app_rtmp_conn.cpp
+++ b/trunk/src/app/srs_app_rtmp_conn.cpp
@@ -109,7 +109,7 @@ SrsRtmpConn::SrsRtmpConn(SrsServer* svr, srs_netfd_t c, string cip, int cport)
     server = svr;
 
     stfd = c;
-    skt = new SrsTcpConnection2(c);
+    skt = new SrsTcpConnection(c);
     manager = svr;
     ip = cip;
     port = cport;
diff --git a/trunk/src/app/srs_app_rtmp_conn.hpp b/trunk/src/app/srs_app_rtmp_conn.hpp
index 138dd1ab4..1151378b7 100644
--- a/trunk/src/app/srs_app_rtmp_conn.hpp
+++ b/trunk/src/app/srs_app_rtmp_conn.hpp
@@ -119,7 +119,7 @@ private:
     SrsClientInfo* info;
 private:
     srs_netfd_t stfd;
-    SrsTcpConnection2* skt;
+    SrsTcpConnection* skt;
     // Each connection start a green thread,
     // when thread stop, the connection will be delete by server.
     SrsCoroutine* trd;
diff --git a/trunk/src/app/srs_app_server.hpp b/trunk/src/app/srs_app_server.hpp
index 11315bf35..c60205a54 100644
--- a/trunk/src/app/srs_app_server.hpp
+++ b/trunk/src/app/srs_app_server.hpp
@@ -40,7 +40,6 @@
 #include <srs_app_gb28181_sip.hpp>
 
 class SrsServer;
-class SrsTcpConnection;
 class SrsHttpServeMux;
 class SrsHttpServer;
 class SrsIngester;