netdev - Re: TCP communication for raw image transmission

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Message-ID: <1325521745.18116.5.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Mon, 02 Jan 2012 17:29:05 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: TCP communication for raw image transmission

Le lundi 02 janvier 2012 à 17:08 +0100, Jean-Michel Hautbois a écrit :

> Yes, and again, I don't want any missing lines :).
> 

Go for tcp :)


> I don't really know what it can do, but it has to do encoding (even if
> it is a SoC, with dedicated devices, memory has to be used).
> The main problem I have, is that I don't have the two boards with me
> today, and even if I can prototype on x86, I can't conclude as far as
> I don't test on the real HW.

Thats going to be tough. You could at least use one board and test if it
can send 100Mbits using netperf (on a x86 target), and check cpu usage.

> This is also why I want to prototype my best bet in the first try :).
> And this is mainly a networking/memory problem.

If the 'no packet loss happens in the network' requirement is OK, then a
plain sendfile() [ or splice() ] will work.

Limiting each tcp frame to a 1 or 2 lines of your image is about
limiting MSS on your tcp session (setsockopt( ... TCP_MAXSEG ))



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