netdev - Re: Maximum no of bytes Ethernet can transfer at a time ??

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Message-ID: <20110427130114.GA1895@hmsreliant.think-freely.org>
Date:	Wed, 27 Apr 2011 09:01:14 -0400
From:	Neil Horman <nhorman@...driver.com>
To:	Ajit <ajitsa_bes@...oo.com>
Cc:	netdev@...r.kernel.org
Subject: Re: Maximum no of bytes Ethernet can transfer at a time ??

On Wed, Apr 27, 2011 at 12:11:35PM +0000, Ajit wrote:
> Guys,
> 
> I have developed a code which uses raw sockets to transfer files. My code skips
> all the upper layer protocols,I have designed a small protocol of my own.
> 
> Now to problem is, whenever I transfer a large file it creates a problem. If
> transfer a file of suppose 100kb or more, only 97.9 Kb is received, unlike in
> the case of files smaller that 97.9.
> 
> What can be the problem ?? Does continuously sending and receiving of frames
> creates a problem ??
> 
> If any one is interested I can give you my code..
> 
> Thank you. 
> 
What transport layer are you using (UDP/TCP/SCTP/etc)?  Does a simmilar transfer
work if you use an actual TCP/UDP socket, rather than your raw one?  If you're
consistently getting 97.9k transferred, that almost sounds like some sort of
firewall type connection limitation.  Take a TCPDump from the peer to get a
better idea of whats going on when the connection fails
Neil

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