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* Re: udp packet loss even with large socket buffer
@ 2004-02-28 22:08 johnny zhao
  2004-03-02 12:58 ` Paulo Marques
  0 siblings, 1 reply; 6+ messages in thread
From: johnny zhao @ 2004-02-28 22:08 UTC (permalink / raw)
  To: vda, linux-kernel

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);
	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;
	int optlen;
	err = setsockopt (session->rtp.socket, SOL_SOCKET, SO_RCVBUF,
	      (void*)&optval, sizeof (optval));
	err = getsockopt (session->rtp.socket, SOL_SOCKET, SO_RCVBUF,
	      (void*)&optval, &optlen);
**************************

the following code is used to receive data:
**************************

      while ( ( error = recvfrom (session->rtp.socket, mp->b_wptr,
					  1500, 0,
					  (struct sockaddr *) &remaddr,
					  &addrlen) ) > 0 )
      {
        mp->b_wptr = mp->b_rptr + error;
        rtp_parse(session, mp);    //this function parses and enqueues the 
received packet
        mp = allocb (1500/*session->max_buf_size*/, 0);   //wang
      }
**************************

These codes are executed in a thread with the highest priority.
Thank you in advance!

Best regards,
Johnny

>From: Denis Vlasenko <vda@port.imtp.ilyichevsk.odessa.ua>
>To: "johnny zhao" <filamoon2@hotmail.com>, linux-kernel@vger.kernel.org
>Subject: Re: udp packet loss even with large socket buffer
>Date: Sat, 28 Feb 2004 23:22:50 +0200
>
>On Saturday 28 February 2004 03:09, johnny zhao wrote:
> > Hi,
> >
> > I have a problem when trying to receive udp packets containing video 
>data
> > sent by Microsoft Windows Messenger. Here is a detailed description:
> >
> > Linux box:
> >     Linux-2.4.21-0.13mdksmp, P4 2.6G HT
> > socket mode:
> >     blocked mode
> > code used:
> >     while ( recvfrom(...) )
> > socket buffer size:
> >     8388608, set by using sysctl -w net.core.rmem_default and rmem_max
> >
> > I used ethereal(using libpcap) to monitor the network traffic. All the
> > packets were transferred and captured by libpcap. But my program 
>constantly
> > suffers from packet loss. According to ethereal, the average time 
>interval
> > between 2 packets  is 70-80ms, and the minimum interval can go down to
> > ~1ms. Each packet is smaller than 1500 bytes (ethernet MTU).
> >
> > Can anybody help me? I googled and found a similar case that had been
> > solved by increasing the socket buffer size. But it doesn't work for me. 
>I
> > think 8M is a crazily large size :(
>
>Post a small program demonstrating your problem.
>(I'd test udp receive with netcat too)
>--
>vda
>

_________________________________________________________________
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^ permalink raw reply	[flat|nested] 6+ messages in thread
* Re: udp packet loss even with large socket buffer
@ 2004-03-03  0:16 johnny zhao
  0 siblings, 0 replies; 6+ messages in thread
From: johnny zhao @ 2004-03-03  0:16 UTC (permalink / raw)
  To: mblack; +Cc: linux-kernel

Thanks for you reply. Unfortunately, it doesn't help :-(

I have uploaded libosip and you can find it here:
http://www.ee.duke.edu/~zw8/msn_linux/libosip-0.9.7.tar.gz

I would appreciate it if you would look into this problem.

Moreover, I'm sure that the usleep() calls in the source tree are not 
actually executed. All these files are not compiled and linked, except 
mediastreamer/msv4l.c, whose usleep calls will not be executed unless it 
fails to open the webcam.

Thank you!

>From: "Mike Black" <mblack@csi-inc.com>
>To: "Charlie (Zhanglei) Wang" <filamoon2@hotmail.com>
>Subject: Re: udp packet loss even with large socket buffer
>Date: Tue, 2 Mar 2004 09:29:21 -0500
>
>I was going to try and duplicate your problem but I can't find the source 
>for libosip (gnu has taken it down from their ftp site).
>However, if your packets are blasting across < 1 ms between than you might 
>need to bump your receive queue like this:
>Default is 300:
>sysctl net.core.netdev_max_backlog
>net.core.netdev_max_backlog = 300
>sysctl -w net.core.netdev_max_backlog=2000
>net.core.netdev_max_backlog = 2000
>Ref: http://datatag.web.cern.ch/datatag/howto/tcp.html
>
>Perhaps your processing is taking long enough that the traffic queue is 
>building up.
>One thing is your usleep and nanosleep I think will be a minimum of 2ms 
>because of timer limitations.
>#include <stdio.h>
>#include <time.h>
>#include <unistd.h>
>
>main()
>{
>    time_t mytime=time(NULL);
>    struct timespec t1,t2;
>    int i=0;
>    while(mytime == time(NULL));
>    mytime = time(NULL);
>    while(mytime == time(NULL)) {
>        t1.tv_sec=0;
>        t1.tv_nsec=100000;
>        nanosleep(&t1,&t2);
>        i++;
>    }
>    printf("i=%d\n",i);
>}
>
>You'll find this program spits out approximately "i=500" no matter how 
>small you make tv_nsec.
>You should also get rid of the usleep()'s in your code.  It's been 
>superceded by nanosleep and could be screwing things up too.
>                usleep(20000);
>./console/sipomatic.c
>                    usleep(pts - now);
>./ffmpeg-0.4.8/ffmpeg.c
>            usleep(100);
>            usleep(100);
>            usleep(100);
>            usleep(100);
>            usleep(100);
>            usleep(10);
>./ffmpeg-0.4.8/libavformat/grab.c
>        }else usleep(20000);
>        }else usleep(20000);
>        }else usleep(20000);
>./mediastreamer/msv4l.c
>        //  usleep(80);
>./oRTP/src/rtpsession.c
>
>
>----- Original Message -----
>From: "Charlie (Zhanglei) Wang" <filamoon2@hotmail.com>
>To: "Denis Vlasenko" <vda@port.imtp.ilyichevsk.odessa.ua>; 
><linux-kernel@vger.kernel.org>
>Sent: Monday, March 01, 2004 9:12 PM
>Subject: Re: udp packet loss even with large socket buffer
>
>
> > hi,
> >
> > Thanks for your reply. If you want to exactly reproduce my problem, 
>please
> > use the following
> > commands to download my codes from cvs:
> >
> > cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/gaim-vv login
> > cvs -z3 -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/gaim-vv co
> > linphone
> >
> > Simply hit enter when prompted for passwd.
> > (1) Please download and install libosip before compiling.
> > (2) Before ./configure, please run command 'rm -Rf ffmpeg; ln -s
> > ffmpeg-0.4.8 ffmpeg'.
> > (3) After 'make' and 'make install', use 'linphonec' to run the program.
> > (4) Under linphonec, use the following commands to communicate with 
>windows
> > messenger:
> >    r www-db.research.bell-labs.com
> >    c <sip:username_of_windows_messenger@www-db.research.bell-labs.com>
> >
> > www-db.research.bell-labs.com is a public sip server.
> >
> > Under Windows Messenger (which runs only under WinXP), use SIP login
> > method. Sign-in name should be
> > username_of_windows_messenger@www-db.research.bell-labs.com
> >
> > Please note that Windows Messenger is different from MSN Messenger.
> >
> > I know it's kind of complicated... :( Thank you in advance!
> > PS: My Linux box and Windows XP box run in the same LAN.
> >
> > Johnny
> >
> > ----- Original Message -----
> > From: "Denis Vlasenko" <vda@port.imtp.ilyichevsk.odessa.ua>
> > To: "johnny zhao" <filamoon2@hotmail.com>; 
><linux-kernel@vger.kernel.org>
> > Sent: Saturday, February 28, 2004 4:22 PM
> > Subject: Re: udp packet loss even with large socket buffer
> >
> >
> > > On Saturday 28 February 2004 03:09, johnny zhao wrote:
> > > > Hi,
> > > >
> > > > I have a problem when trying to receive udp packets containing video
> > data
> > > > sent by Microsoft Windows Messenger. Here is a detailed description:
> > > >
> > > > Linux box:
> > > >     Linux-2.4.21-0.13mdksmp, P4 2.6G HT
> > > > socket mode:
> > > >     blocked mode
> > > > code used:
> > > >     while ( recvfrom(...) )
> > > > socket buffer size:
> > > >     8388608, set by using sysctl -w net.core.rmem_default and 
>rmem_max
> > > >
> > > > I used ethereal(using libpcap) to monitor the network traffic. All 
>the
> > > > packets were transferred and captured by libpcap. But my program
> > constantly
> > > > suffers from packet loss. According to ethereal, the average time
> > interval
> > > > between 2 packets  is 70-80ms, and the minimum interval can go down 
>to
> > > > ~1ms. Each packet is smaller than 1500 bytes (ethernet MTU).
> > > >
> > > > Can anybody help me? I googled and found a similar case that had 
>been
> > > > solved by increasing the socket buffer size. But it doesn't work for 
>me.
> > I
> > > > think 8M is a crazily large size :(
> > >
> > > Post a small program demonstrating your problem.
> > > (I'd test udp receive with netcat too)
> > > --
> > > vda
> > >
> > > -
> > > To unsubscribe from this list: send the line "unsubscribe 
>linux-kernel" in
> > > the body of a message to majordomo@vger.kernel.org
> > > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > > Please read the FAQ at  http://www.tux.org/lkml/
> > >
> > -
> > To unsubscribe from this list: send the line "unsubscribe linux-kernel" 
>in
> > the body of a message to majordomo@vger.kernel.org
> > More majordomo info at  http://vger.kernel.org/majordomo-info.html
> > Please read the FAQ at  http://www.tux.org/lkml/

_________________________________________________________________
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^ permalink raw reply	[flat|nested] 6+ messages in thread
* udp packet loss even with large socket buffer
@ 2004-02-28  1:09 johnny zhao
  2004-02-28 21:22 ` Denis Vlasenko
  0 siblings, 1 reply; 6+ messages in thread
From: johnny zhao @ 2004-02-28  1:09 UTC (permalink / raw)
  To: linux-kernel

Hi,

I have a problem when trying to receive udp packets containing video data 
sent by Microsoft Windows Messenger. Here is a detailed description:

Linux box:
    Linux-2.4.21-0.13mdksmp, P4 2.6G HT
socket mode:
    blocked mode
code used:
    while ( recvfrom(...) )
socket buffer size:
    8388608, set by using sysctl -w net.core.rmem_default and rmem_max

I used ethereal(using libpcap) to monitor the network traffic. All the 
packets were transferred and captured by libpcap. But my program constantly 
suffers from packet loss. According to ethereal, the average time interval 
between 2 packets  is 70-80ms, and the minimum interval can go down to ~1ms. 
Each packet is smaller than 1500 bytes (ethernet MTU).

Can anybody help me? I googled and found a similar case that had been solved 
by increasing the socket buffer size. But it doesn't work for me. I think 8M 
is a crazily large size :(

Thank you!

_________________________________________________________________
Get fast, reliable access with MSN 9 Dial-up. Click here for Special Offer! 
http://click.atdmt.com/AVE/go/onm00200361ave/direct/01/


^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2004-03-03  0:16 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2004-02-28 22:08 udp packet loss even with large socket buffer johnny zhao
2004-03-02 12:58 ` Paulo Marques
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2004-03-03  0:16 johnny zhao
2004-02-28  1:09 johnny zhao
2004-02-28 21:22 ` Denis Vlasenko
2004-03-02  2:12   ` Charlie (Zhanglei) Wang

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