Date: Fri, 23 Jan 2004 02:18:44 +0100 From: Andre Oppermann <andre@freebsd.org> To: Mike Hunter <mhunter@ack.Berkeley.EDU> Cc: freebsd-net@freebsd.org Subject: Re: Dell D800 (FBSD 5.2-release) Broadcom BCM5705M MTU/Jumbo Problem Message-ID: <40107674.A5C22203@freebsd.org> References: <20040123011206.GA1701@ack.Berkeley.EDU>
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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 :|
Hmm... works for me (on my shiny new dual-Opteron):
# ifconfig bge1 mtu 2000
# ifconfig bge1
bge1: flags=8842<BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 2000
options=1b<RXCSUM,TXCSUM,VLAN_MTU,VLAN_HWTAGGING>
ether 00:e0:81:27:e0:aa
media: Ethernet autoselect (100baseTX <full-duplex>)
status: active
Mine is a 5704C dual GigE chip.
--
Andre
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