netdev - Re: TCP communication for raw image transmission

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Date:	Thu, 05 Jan 2012 10:55:43 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jean-Michel Hautbois <jhautbois@...il.com>
Cc:	Rick Jones <rick.jones2@...com>, netdev@...r.kernel.org
Subject: Re: TCP communication for raw image transmission

Le jeudi 05 janvier 2012 à 10:48 +0100, Jean-Michel Hautbois a écrit :

> It does not seem to work :
> netperf -H 192.168.0.1 -l 10 -t UDP_STREAM
> MIGRATED UDP STREAM TEST from 0.0.0.0 (0.0.0.0) port 0 AF_INET to
> 192.168.0.1 (192.168.0.1) port 0 AF_INET
> Socket  Message  Elapsed      Messages
> Size    Size     Time         Okay Errors   Throughput
> bytes   bytes    secs            #      #   10^6bits/sec
> 
> 106496   65507   10.01        1836      0       0.00
> 419227124           0.00      536870912              0.00
> 

Thats because netperf -t UDP_STREAM sends big UDP frames by default,
that must be fragmented, and defragmented on destination. Maybe some
frags are lost.

Try :

netperf -H 192.168.0.1 -l 10 -t UDP_STREAM -- -m 1500


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