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Date: Fri, 9 Jun 2006 20:19:00 -0400
From: Brad <brad@comstyle.com>
To: Mikhail Teterin <mi+mx@aldan.algebra.com>
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Cc: wpaul@windriver.com, net@freebsd.org
Subject: Re: Can't turn on Jumbo Frames on bge0
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On Fri, Jun 09, 2006 at 08:05:47PM -0400, Mikhail Teterin wrote:
> ?'?????? 09 ??????? 2006 19:57, Brad ???????:
> > There is a mistake on that web-page. None of Broadcom's PCI Express
> > chipsets support Jumbo frames.
> 
> Indeed. Our bge(4) manual page says:
> 
>      The BCM570x also supports jumbo frames, which can be configured via the
>      interface MTU setting.  Selecting an MTU larger than 1500 bytes with the
>      ifconfig(8) utility configures the adapter to receive and transmit jumbo
>      frames.  Using jumbo frames can greatly improve performance for certain
>      tasks, such as file transfers and data streaming.
> 
> Mine is BCM5751 -- I guess, I'm out of luck...

I made sure the OpenBSD man page is very clear as to what models do support Jumbo
frames after having a few end-users ask similar questions.

     The BCM5700, BCM5701, BCM5703, BCM5704, BCM5714 and BCM5780 are capable
     of supporting Jumbo frames, which can be configured via the interface MTU
     setting.  Selecting an MTU larger than 1500 bytes with the ifconfig(8)
     utility configures the adapter to receive and transmit Jumbo frames.  Us-
     ing Jumbo frames can greatly improve performance for certain tasks, such
     as file transfers and data streaming.

I would suggest doing the same thing for the FreeBSD man page since there are a
number of chipset revisions which do not support Jumbo's.