add comments for bug #194, #196

@@ -513,14 +513,19 @@ int SrsRtmpConn::playing(SrsSource* source)
     SrsAutoFree(SrsConsumer, consumer);
     srs_verbose("consumer created success.");
     
-    rtmp->set_recv_timeout(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
-    
     // initialize other components
     SrsPithyPrint pithy_print(SRS_CONSTS_STAGE_PLAY_USER);
     SrsMessageArray msgs(SYS_CONSTS_MAX_PLAY_SEND_MSGS);
     bool user_specified_duration_to_stop = (req->duration > 0);
     int64_t starttime = -1;
     
+    // TODO: use isolate thread to recv, 
+    // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196
+    // the performance bottleneck not in the timeout recv, but 
+    // in the multiple messages send, so it's ok for timeout recv,
+    // @see https://github.com/winlinvip/simple-rtmp-server/issues/194
+    rtmp->set_recv_timeout(SRS_CONSTS_RTMP_PULSE_TIMEOUT_US);
+    
     while (true) {
         // TODO: to use isolate thread to recv, can improve about 5% performance.
         // @see: https://github.com/winlinvip/simple-rtmp-server/issues/196

@@ -212,7 +212,9 @@ private:
 // peer out
 private:
     /**
-    * cache for multiple messages send
+    * cache for multiple messages send,
+    * initialize to iovec[SRS_CONSTS_IOVS_MAX] and realloc when consumed,
+    * it's ok to realloc the iovs cache, for all ptr is ok.
     */
     iovec* out_iovs;
     int nb_out_iovs;