Date: Sat, 11 Jun 2011 21:07:02 +0200 From: "K. Macy" <kmacy@freebsd.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-net@freebsd.org Subject: Re: FreeBSD I/OAT (QuickData now?) driver Message-ID: <BANLkTimHG19JbwViYZf8vch9=exgxASTig@mail.gmail.com> In-Reply-To: <20110611185533.GA67980@onelab2.iet.unipi.it> References: <BANLkTinuOS_yZYrqZ4cmU4cim%2BKFHNA=hQ@mail.gmail.com> <alpine.BSF.2.00.1106111645010.44950@fledge.watson.org> <20110611181352.GA67777@onelab2.iet.unipi.it> <BANLkTi=VspGAjP2W9ttLHpw%2BcH1SESyVFQ@mail.gmail.com> <20110611185533.GA67980@onelab2.iet.unipi.it>
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> This said, one should consider that going fast and being > completely general don't go well together -- you don't do > F1 races with a minivan, and don't carry large groups of > people around with an F1 car. This is self-evident, any sort of multiplexing comes at a price. To have the card be simultaneously general and support direct access requires dedicated hardware like the quasi-IOMMU on the Solarflare cards. > I don't think we'll ever manage > to have both at the same time. It is good to have a > "transformer" vehicle though! >From my point of view, the general utility of this all boils down to how easy it is to use the "bridge". I'll take a look in to interfacing to netmap with my user level TCP stack to get a feel for the latter. Thanks for the clarification. -Kip
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