On Tue, 25 Oct 2016, Chris Albertson wrote: > Date: Tue, 25 Oct 2016 22:12:14 -0700 > From: Chris Albertson <albertson.ch...@gmail.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: Re: [Emc-users] following along in my what if musings about ther new > oramge pi 2e > > Does anyone here know of one verified case where a packet was dropped by a > switch? This just does not happen > > Also, if you place a second Ethernet dongle on the Pi, the dongle and the > built-in port share a serial bus. This is not really an issue but it you > don't like the idea of a multiplexed bus, you can't avoid it. > > Switches are not like routers they work at the Ethernet packet level and > only read the first few bits of each packet then cut it through fro input > FIFO to output FIFO. It is done in special hardware
Small sample but I've run 4 of our Ethernets cards at 1 KHz through a switch for a week 24/7 without a single dropped packet > > On Tue, Oct 25, 2016 at 8:39 AM, Przemek Klosowski < > przemek.klosow...@gmail.com> wrote: > >> On Mon, Oct 24, 2016 at 11:18 PM, Chris Albertson >> <albertson.ch...@gmail.com> wrote: >>> Let's say we have two computers and each is sending UDP packets to two >>> different Mesa cards. I can't see how those packets would ever be on >>> the same physical cable, assuming a switched network. Each computer >>> has its own cable to the switch. The switch will read the packets and >>> place them on different outbound ports each with its own cable going >>> to the different Mesa boards. The UDP packets can't collide >> >> In theory, no. In practice, they all use the internal switch bus, and >> you are depending on the implementation details of a random network >> switch chip from a far-away country. Maybe they can switch fine on the >> first simultaneous arrival but can't sustain repeated collisions, or >> whatever. You just have to test it, and it's not quite easy-you'd have >> to set up four (or 2*N) independent Ethernet stations with very >> tightly coordinated on-wire packet streams. >> >> ------------------------------------------------------------ >> ------------------ >> The Command Line: Reinvented for Modern Developers >> Did the resurgence of CLI tooling catch you by surprise? >> Reconnect with the command line and become more productive. >> Learn the new .NET and ASP.NET CLI. Get your free copy! >> http://sdm.link/telerik >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > > > -- > > Chris Albertson > Redondo Beach, California > ------------------------------------------------------------------------------ > The Command Line: Reinvented for Modern Developers > Did the resurgence of CLI tooling catch you by surprise? > Reconnect with the command line and become more productive. > Learn the new .NET and ASP.NET CLI. Get your free copy! > http://sdm.link/telerik > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > Peter Wallace Mesa Electronics (\__/) (='.'=) This is Bunny. Copy and paste bunny into your (")_(") signature to help him gain world domination. ------------------------------------------------------------------------------ The Command Line: Reinvented for Modern Developers Did the resurgence of CLI tooling catch you by surprise? Reconnect with the command line and become more productive. Learn the new .NET and ASP.NET CLI. Get your free copy! http://sdm.link/telerik _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
