Re: [Playerstage-users] v4l and "bytes leftover" warning

[Nicola B. <nb...@es...>]

On Tuesday 19 Jul 2005 16:06, Brian Gerkey wrote:
>
> You can change the size of those buffers with setsockopt().  Check
> the man page for details.  You would use the SO_SNDBUF and SO_RCVBUF
> options to change the size of the send and receive buffers,
> respectively.  I would try increasing the server's send buffer and
> the client's receive buffer.  I don't know whether the OS puts a hard
> limit on the size of those buffers.  You can put the call to
> setsockopt() pretty much anywhere after the socket has been created
> at each end.  Let me know if and how well that works.

Well spotted Brian,
I've followed your suggestions and the warning disappeared :)
Here's the code I've inserted in "server/clientmanager.cc", line 446 (please 
forgive the ugly code, I just took some examples of setsockopt/getsockopt I 
found online...):

-----
   int bufSize = 1024 * 256;
   if (setsockopt(clientData->socket, SOL_SOCKET, SO_SNDBUF, (char *)&bufSize, 
(int)sizeof(bufSize)) != 0)
   {
       fprintf(stderr, "Error calling setsockopt\n");
       exit(-1);
   }
   int sndSize = 0;
   int size = sizeof(int);
   if (getsockopt(clientData->socket, SOL_SOCKET, SO_SNDBUF, (char *)&sndSize, 
(socklen_t*)&size) != 0)
   {
       fprintf(stderr, "Error calling getsockopt\n");
       exit(-1);
   }
   else
      fprintf(stderr, "Send buffer size: %d\n", sndSize);
-----

I did the same on the client side, increasing the input buffer of 
"PlayerClient::conn.socket" with the option SO_RCVBUF.
Everything seems to work fine now.
Thanks
Nicola

-- 
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Nicola Bellotto
University of Essex
Department of Computer Science
Wivenhoe Park
Colchester CO4 3SQ
United Kingdom

Room: 1N1.2.8
Tel. +44 (0)1206 874094
E-Mail: nb...@es...
URL: http://privatewww.essex.ac.uk/~nbello
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