Date: Sat, 15 Sep 2007 11:12:40 -0700 From: Julian Elischer <julian@elischer.org> To: Randy Bush <randy@psg.com> Cc: FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: BCE on FreeBSD and oversized packet acceptance. Message-ID: <46EC2098.2000908@elischer.org> In-Reply-To: <46EC16DC.2010104@psg.com> References: <46EAE78D.8060108@elischer.org> <46EC0E75.5070307@psg.com> <46EC1575.4070401@elischer.org> <46EC16DC.2010104@psg.com>
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Randy Bush wrote: >>>> what size is the actual maximal sized jumbo packet we will ever see? >>> some transpac science community folk, who care more about speed trials >>> with big data sets than they do about over-stretching the ethernet crc, >>> use 9k jumbo frames. >> well that's the standard but the highest I've seen mentioned as a normal >> size is I think 9220 bytes. > > i suggest being careful with the word "standard." ieee, which controls > the ethernet spec, has refused to standardize anything above 1500 on the > grounds that it would over-stretch the crc. > true, (I was surprised to not see 9k packets in the standard (though old) that I have. (I guess now I'm in Cisco I could get to a newer one). but practicality suggests that we spport what the customer is doing. > randy
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