g_io_channel too slow on linux

[Luis Ariel Lecca <ariel_xxii yahoo com ar>]

Hello, please take a moment to read this. I will appreciate any help.
I have a gtk application that runs on linux and win32.
I writing on a serial display but on linux the com flushes too slow while on win32
seems ok.
I test it the display with the hyperterminal and didnt see any problem with it.
I test it with the application (under win32) and didnt see any problem on it neither.

I used setserial to configure my linux com properly, and I made an struct termios configuration too
like below, but I see how the serial com write the data very slowly.

When I quit from main loop, the application wait for com flushes the data, since the com is handle by the OS.

Have You any idea about how to solve this ?
Thank You

void ttyS_config( void )
{
 struct termios oldtio;
 struct termios newtio;
 gint                                           S32dev = 0;
 guchar data[16];
 
 S32dev = open( "/dev/ttyS2", O_RDWR | O_NOCTTY /*| O_NDELAY*/ | O_NONBLOCK );
 if( S32dev >= 0 )
 {
  memset( &oldtio, 0x00, sizeof(oldtio) );
  memset( &newtio, 0x00, sizeof(newtio) );
  tcgetattr( S32dev,&oldtio );
  
        fcntl( S32dev, F_SETFL, FNDELAY/*FASYNC*/ );
  
  newtio.c_cflag = B9600 | CS8 | CLOCAL | CREAD;
  newtio.c_cflag &= (~PARENB);
  newtio.c_cflag &= (~CSTOPB);
  newtio.c_cflag &= (~CRTSCTS);
  
  newtio.c_iflag = IGNPAR;
  
  newtio.c_oflag = 0;
  
  newtio.c_lflag    &= ~(ICANON|ECHO|ECHOE|ISIG);
  newtio.c_cc[VMIN]  = 0;
  newtio.c_cc[VTIME] = 0;
  
  tcflush( S32dev, TCIFLUSH );
  tcsetattr( S32dev, TCSANOW, &newtio );
  
  sprintf( data, "%s", "Starting..." );
  write( S32dev, data, strlen(data) );
  close(S32dev);
 }
 else
 {
  perror( "/dev/ttyS2" );
  exit(-1);
 }
 return;
}

/*********************************************/

#ifdef G_OS_WIN32
  gchar* C8pfile = "\\\\.\\COM2";
#else
  gchar* C8pfile = "/dev/ttyS2";
#endif
GIOFlags        giof_flags = G_IO_FLAG_NONBLOCK;
gint8   S8retval = -1;

#ifdef __PATCH_TEST_CHANGE_TERMIOS_CFG_FIRST__
 ttyS_config();
#endif

gioch_file = g_io_channel_new_file ( C8pfile, "r+", NULL );
giof_flags |= g_io_channel_get_flags( gioch_file );
g_io_channel_set_flags( gioch_file, giof_flags, NULL );

g_io_channel_set_encoding( gioch_file, NULL, NULL );
g_io_channel_seek_position( gioch_file, 0, G_SEEK_SET, NULL );

/*********************************************/



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