netdev - Jumbo frame question...

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Message-ID: <200907241141.55097.rgetz@blackfin.uclinux.org>
Date:	Fri, 24 Jul 2009 11:41:55 -0400
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	netdev@...r.kernel.org
Subject: Jumbo frame question...

Should a gigabit card, configured as 100, be sending jumbo UDP frames?

My understanding, is no - this is a spec violation..

Settings for eth0:
        Supported ports: [ MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
                                1000baseT/Half 1000baseT/Full
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Half
        Port: Twisted Pair
        PHYAD: 1
        Transceiver: internal
        Auto-negotiation: on
        Supports Wake-on: g
        Wake-on: d
        Current message level: 0x000000ff (255)
        Link detected: no

happly sends UDP packets over 1500 bytes in length.

Tested with TFTP, and 2.6.27 (as the tftp server).

If tftp requests block sizes that are 4096 bytes, the sent packet is a single 
4096 byte packet (not multiple MTU sized packets).

?

Thanks
-Robin
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