Re: udp packet loss even with large socket buffer
From: Paulo Marques
Date: Tue Mar 02 2004 - 08:02:38 EST
johnny zhao wrote:
hi,
Since my program is coping with MSN, it's not easy to post a small
example. But I will try :)
I use the following code to initialize the socket:
*****************************
session->rtp.loc_addr.sin_family = AF_INET;
session->rtp.loc_addr.sin_addr.s_addr = INADDR_ANY;
session->rtp.loc_addr.sin_port = htons (port);
session->rtp.socket = socket (PF_INET, SOCK_DGRAM, 0);
^^^
This should really be IPPROTO_UDP as defined in <netinet/in.h>
g_return_val_if_fail (session->rtp.socket > 0, -1);
err = bind (session->rtp.socket,
(struct sockaddr *) &session->rtp.loc_addr,
sizeof (struct sockaddr_in));
/* set the address reusable */
err = setsockopt (session->rtp.socket, SOL_SOCKET, SO_REUSEADDR,
(void*)&optval, sizeof (optval));
optval = 8388608;
You are right, this is really a huuuuuge buffer. If you are getting a 1.5kb
packet every 80 ms on average, this is about 20kb/second. Even a 64kb buffer
should be much more than enough.
My advice is just request a 64kb buffer, and stop messing with the rmem_default
and rmem_max parameters.
--
Paulo Marques - www.grupopie.com
"In a world without walls and fences who needs windows and gates?"
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