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>
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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 And the man page is more than likely out of date.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.home | help
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