Date: Thu, 16 Mar 2006 13:58:14 -0500 From: Brad <brad@comstyle.com> To: freebsd-net@freebsd.org Subject: Re: jumbo em Message-ID: <20060316185814.GB23644@blar.home.comstyle.com> In-Reply-To: <2a41acea0603160842i6a8aa2adk63ce7ffc4a2e5113@mail.gmail.com> References: <011901c648ea$4a738670$0701010a@notebook> <2a41acea0603160842i6a8aa2adk63ce7ffc4a2e5113@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Mar 16, 2006 at 08:42:09AM -0800, Jack Vogel wrote: > On 3/16/06, Yuriy N. Shkandybin <jura@networks.ru> wrote: > > Hello > > > > I have 2 freebsd servers connected by dedicated wire via em interfaces. > > systems = 6.1-PRERELEASE #0: Tue Mar 14 11:58:23 MSK 2006 > > > > 1st) > > man em says > > MTU size for Jumbo Frames is 16114 and i'm sure i've setup this on freebsd-5 and probably ealier 6.0 > > But now > > ifconfig em1 mtu 16114 > > ifconfig: ioctl (set mtu): Invalid argument > > 16110 - max possible > > With newer hardware the FIFO has been getting smaller, so jumbos > even this large wont be allowed, I'm away from the code right now > but on the 82571 adapter its max is in the 9K range. > > And the man page is more than likely out of date. > > Whether you can do jumbos at all, and if so, what size you are allowed > to make them is adpater specific. > > Jack The maximum MTU size for 82571 and 82572 based adapters is 10,482. 82573 has no Jumbo support and the rest can have up to 16k.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20060316185814.GB23644>