disable read ahead algorithm so we don't waste bandwidth..

libssh2/src/sftp.c

@@ -1414,12 +1414,9 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
             /* Number of bytes asked for that haven't been acked yet */
             size_t already = (size_t)(filep->offset_sent - filep->offset);
 
-            size_t max_read_ahead = buffer_size*4;
+            size_t max_read_ahead = buffer_size;
             unsigned long recv_window;
 
-            if(max_read_ahead > LIBSSH2_CHANNEL_WINDOW_DEFAULT*4)
-                max_read_ahead = LIBSSH2_CHANNEL_WINDOW_DEFAULT*4;
-
             /* if the buffer_size passed in now is smaller than what has
                already been sent, we risk getting count become a very large
                number */
@@ -1472,8 +1469,8 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
             uint32_t request_id;
 
             uint32_t size = count;
-            if(size < buffer_size)
-                size = buffer_size;
+            //if(size < buffer_size)
+            //    size = buffer_size;
             if(size > MAX_SFTP_READ_SIZE)
                 size = MAX_SFTP_READ_SIZE;
 
@@ -1576,7 +1573,7 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
                 else {
                     /* we should never reach this point */
                     return _libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL,
-                                          "sftp_read() internal error");
+                                          "sftp_read() internal error a");
                 }
             }
 
@@ -1722,7 +1719,7 @@ static ssize_t sftp_read(LIBSSH2_SFTP_HANDLE * handle, char *buffer,
 
     /* we should never reach this point */
     return _libssh2_error(session, LIBSSH2_ERROR_SFTP_PROTOCOL,
-                          "sftp_read() internal error");
+                          "sftp_read() internal error b");
 }
 
 /* libssh2_sftp_read