Date: Mon, 17 Mar 2014 13:34:16 +0000 From: Wayne Hotmail <testdog@hotmail.com> To: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Intel 10 gig cards mtu 9000 Message-ID: <BLU172-W3586E52A8B50484632FA77B57D0@phx.gbl>
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I am unable to add 2 Intel 10 gig nics to my Freebsd 9.1 at 9000 MTU. I tried to add them last night and was only able to set only a max of 4000 MTU. I get an error telling me kernel: ix1: Could not setup receive structures and the interface will not pass traffic. I found these changes on the Intel readme but this did solve my issue. kern.ipc.nmbclusters=262144 kern.ipc.nmbjumbop=262144 There seems to be some calculation that needs to be done with multiple CPUs. I am running 12 cpus what tweak do I need to make so I can run my MTUs at 9000 on my 1 NIC with no vlans and 1 NIC with 3 vlans on it. Wayne
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