Date: Tue, 12 Jun 2007 11:22:17 -0700 From: Alfred Perlstein <alfred@freebsd.org> To: Kip Macy <kip.macy@gmail.com> Cc: src-committers@freebsd.org, Andre Oppermann <andre@freebsd.org>, cvs-src@freebsd.org, cvs-all@freebsd.org, Jack Vogel <jfvogel@gmail.com>, Sam Leffler <sam@errno.com> Subject: Re: cvs commit: src/sys/net if.h Message-ID: <20070612182217.GP96936@elvis.mu.org> In-Reply-To: <b1fa29170706111554u6308df0cg2b4f6208672a1620@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> <b1fa29170706111554u6308df0cg2b4f6208672a1620@mail.gmail.com>
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* Kip Macy <kip.macy@gmail.com> [070611 15:54] wrote: > >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. True, but support it is relatively trivial from the kernel PoV. Basically you allow the process to fetch which cpu a socket is bound to, then you can use descriptor passing (processes) or shared fdtable (threads) and a call to bind to cpu to properly juggle things around. -- - Alfred Perlstein
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