netdev - Re: Jumbo frame question...

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Message-ID: <4A69E3CF.1040805@hp.com>
Date:	Fri, 24 Jul 2009 09:39:43 -0700
From:	Rick Jones <rick.jones2@...com>
To:	David Miller <davem@...emloft.net>
CC:	rgetz@...ckfin.uclinux.org, netdev@...r.kernel.org
Subject: Re: Jumbo frame question...

David Miller wrote:
> From: Robin Getz <rgetz@...ckfin.uclinux.org>
> Date: Fri, 24 Jul 2009 11:41:55 -0400
> 
>>Should a gigabit card, configured as 100, be sending jumbo UDP frames?
>>
>>My understanding, is no - this is a spec violation..

In so far as there is no de jure spec for Jumbo Frames, it is rather difficult 
to have a spec violation :).

> There is nothing wrong with supporting jumbo frames
> when the speed is lower than 1GB.
> 
> If you configure the MTU to be jumbo size, it should
> be no surprise to you that this is what gets used.

Not a case of too much rope?  Given that (IIRC) Jumbo Frame was not introduced 
in Ethernet NICs until Gigabit came along (eg Alteon), the chances a (legacy) 
100 Mbit/s network would have JF-capable NICs is epsilon.

rick jones

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