Date: Mon, 11 Jun 2007 15:54:30 -0700 From: "Kip Macy" <kip.macy@gmail.com> To: "Jack Vogel" <jfvogel@gmail.com> Cc: Sam Leffler <sam@errno.com>, src-committers@freebsd.org, Andre Oppermann <andre@freebsd.org>, cvs-all@freebsd.org, cvs-src@freebsd.org Subject: Re: cvs commit: src/sys/net if.h Message-ID: <b1fa29170706111554u6308df0cg2b4f6208672a1620@mail.gmail.com> In-Reply-To: <2a41acea0706111403l5f4e1db1re2c901670e327485@mail.gmail.com> References: <200706112008.l5BK8CQ7033543@repoman.freebsd.org> <466DACD6.4040606@errno.com> <2a41acea0706111330v6a39cf84o495f6acf62ba7ff7@mail.gmail.com> <2a41acea0706111333p5349993dg9315bfe8396f78a@mail.gmail.com> <466DB362.8010902@freebsd.org> <2a41acea0706111346l227b1399jd80d85771345d8be@mail.gmail.com> <466DB70D.8080800@freebsd.org> <2a41acea0706111403l5f4e1db1re2c901670e327485@mail.gmail.com>
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> I think its a windowism, stands for Receive Side Scaling, and what it means > is multiple receive queues, each with an MSI/X vector so they can interrupt > different CPUs, or they can be tied to virtual guests, or MACs, etc etc... AFAICT FreeBSD can't currently benefit from this as there is no cpu affinity for connections. I may be wrong, but I see lower single-connection throughput using a receive queue per core than using a single receive queue. RSS is done by hashing a TCP tuple (I'm deliberately vague because at least with cxgb there are multiple combinations, the default is the standard 4-tuple) to a receive queue. -Kip
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