Date: Fri, 4 Jun 2010 09:37:11 +0200 From: "alteriks@gmail.com" <alteriks@gmail.com> To: pyunyh@gmail.com Cc: freebsd-net@freebsd.org Subject: Re: Is enabling jumbo frames on RTL8111C possible? Message-ID: <201006040937.11859.alteriks@gmail.com> In-Reply-To: <20100603172037.GA13502@michelle.cdnetworks.com> References: <AANLkTikOwX2gT_4NS5HNhLu7Vlw0wl6nmtzGmDHZ_Su6@mail.gmail.com> <20100603172037.GA13502@michelle.cdnetworks.com>
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On Thursday, 3 of June 2010 19:20:38 Pyun YongHyeon wrote: > RealTek no longer releases datasheet so it's hard to know required > information to support jumbo frame. It seems driver released by > vendor has magic code which enables jumbo frame as well as DSP > fixups. The magic code is very complex and hard to understand the > meaning. It seems Linux borrowed the magic code from vendor but I > guess they also don't know what the magic code does and why the > magic is needed. > > Controllers targeted to servers show very good performance number > with jumbo frame(e.g. about 990Mbps for bulk TCP transfers) but I'm > not sure how well consumer controller works with jumbo frame. > Vendor driver disables checksum offloading when jumbo frame is > used. This indicates the controller has very small FIFO(less than 1 > jumbo frame size) which in turn means it may show poor performance > under load. Thanks for explanation.
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