On Wed, Sep 13, 2017 at 09:39:02PM -0400, Richard Pieri wrote: > On 9/13/2017 3:23 PM, Dan Ritter wrote: > > So, no, you don't need jumbo packets to get 900+Mb/s > > out of your 1000Mb/s ethernet connection. That's through > > a very boring Netgear $50 switch. > > Information is missing. > > 1000Base-T is 500Mbps each way (theoretical maximum), but it works with > Cat 5e. You cannot get 900Mbps throughput with 1000Base-T. It's > physically impossible. Real world throughput with file data is around > the 300Mbps I previously cited. > > 1000Base-TX is 1000Mbps each way (theoretical maximum), requires full > duplex switches (I believe but don't quote me on that), and Cat 6 or Cat > 7. You can get nearly 1000Mbps throughput with 1000Base-TX if your > equipment meets all of these criteria. And the NICs involved have > enterprise class features like all of the various CPU offloading > capabilities which consumer grade equipment typically does not have. > Again, since this is "future-proofing a house" and not a corporate data > center I'm figuring a majority of the equipment in use is going to be > consumer grade and not enterprise grade.
I just showed you measurements. One end is an AMD FX-4130 with a Realtek 8168/8411 gig-e port, built-in to the motherboard. The other end is an Intel G3258 with an Intel I218-V gig-e port, also on the motherboard. They are connected via Cat5e cables to a Netgear GS316, a 16 port gig-e switch that you can buy from NewEgg for $60 now; it was on sale for $50 or so when I bought it. Transmission speed as measured by netperf is 930-940 Mb/s. The MTU is 1500 -- I had it set at 7000 for some months, but it caused problems with a new machine, so I sighed, backed off, and did not notice any real-world difference. Your "300Mb/s" is an artifact of your disk subsystems. -dsr- _______________________________________________ Discuss mailing list Discuss@blu.org http://lists.blu.org/mailman/listinfo/discuss
