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Date: Thu, 22 Jan 2004 19:59:38 -0600
From: Eric Anderson <anderson@centtech.com>
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To: Mike Hunter <mhunter@ack.Berkeley.EDU>
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cc: dell-d800@eicat.ca
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Subject: Re: [D800] Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo
 Problem
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Mike Hunter wrote:

>Hi everybody,
>
>I'm going to be trying to get gigabit throughput between my laptop (Dell
>Latitude D800 running 5.2-release) and a shuttle box running FreeBSD 5.1 
>(not in front of me at the moment.)  As part of the process, I attempted
>to increase the frame size on my laptop, only to be greeted with
>disappointment:
>
>celeste# ifconfig bge0
>bge0: flags=8802<BROADCAST,SIMPLEX,MULTICAST> mtu 1500
>        options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
>        ether 00:0b:db:99:d6:06
>        media: Ethernet 1000baseTX <full-duplex> (none)
>        status: no carrier
>celeste# ifconfig bge0 mtu 9000
>ifconfig: ioctl (set mtu): Invalid argument
>celeste# ifconfig bge0 mtu 1501
>ifconfig: ioctl (set mtu): Invalid argument
>celeste# ifconfig bge0 mtu 1500
>celeste#
>
>The C file talks about being able to do jumbo frames when the mtu is big
>enough...anybody know what I'm missing?  My card is a "Broadcom BCM5705M"
>and I'm running FreeBSD 5.2-release.  When I asked google, it mostly
>pointed me at comments in if_bge.c talking about jumbo frames :|
>  
>

As a data point, my BCM5702 (Dell D600) works fine:
# ifconfig -a
bge0: flags=8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 9000
        options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
        inet6 fe80::20b:dbff:fea3:f9a1%bge0 prefixlen 64 scopeid 0x1
        inet 0.0.0.0 netmask 0xff000000 broadcast 255.255.255.255
        ether 00:0b:db:a3:f9:a1
        media: Ethernet autoselect (none)
        status: no carrier


Eric



-- 
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Eric Anderson     Sr. Systems Administrator    Centaur Technology
Today is the tomorrow you worried about yesterday.
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