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SubjectRe: udp packet loss even with large socket buffer
Date
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
>
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