From mboxrd@z Thu Jan  1 00:00:00 1970
From: Rick Jones <rick.jones2@hp.com>
Subject: Re: [PATCH] Configurable tap interface MTU
Date: Tue, 11 Sep 2007 10:20:53 -0700
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Cc: netdev@vger.kernel.org, maxk@qualcomm.com,
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To: Ed Swierk <eswierk@arastra.com>
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Ed Swierk wrote:
> This patch makes it possible to change the MTU on a tap interface.
> Increasing the MTU beyond the 1500-byte default is useful for
> applications that interoperate with Ethernet devices supporting jumbo
> frames.
> 
> The patch caps the MTU somewhat arbitrarily at 16000 bytes. This is
> slightly lower than the value used by the e1000 driver, so it seems
> like a safe upper limit.

FWIW the OFED 1.2 bits take the MTU of IPoIB up to 65520 bytes :)

rick jones