jumbo frame support in bge(4) for BCM5704

David Newman dnewman at networktest.com
Wed Sep 15 22:17:18 UTC 2010

On 9/14/10 7:43 PM, Adam Vande More wrote:
> On Tue, Sep 14, 2010 at 9:19 PM, David Newman <dnewman at networktest.com>wrote:
>> 8.0-RELEASE amd64, Tyan S2882-D motherboard, Broadcom BCM5704C gigabit
>> Ethernet transceivers
>> Thanks in advance for any clues on enabling jumbos on this system.
> What happens if you boot from a linux live cd and try to enable frames
> there?

With Ubuntu 10.04, the system accepts "ifconfig eth1 mtu N" for any
value of N up to 9000, and shows an MTU of N in response to 'ifconfig'.

With 8.1-RELEASE (not 8.0 as stated before, sorry), the command
'ifconfig bge0 mtu 8000' produces an error:

ifconfig: ioctl (set mtu): Invalid argument

Same thing with 'mtu 1500', 'mtu 1400', etc.


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