http://www.dslreports.com/forum/Why-is-gigabit-slower-23305336 en Fri, 10 Feb 2012 15:20:31 EDT Fri, 10 Feb 2012 15:20:31 EDT http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23335490
L.]]> http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23335490 Fri, 13 Nov 2009 09:33:05 EDT http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23309245
There is an issue with your switch, or one or both giga cards. You could diagnose it with iperf. Other then seeing it, you can't really diagnose anything by copying files.

Brands of cards, switch? OSes used?
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My place : »www.schettino.us]]> http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23309245 Sun, 08 Nov 2009 08:05:59 EDT http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23308737 http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23308737 Sun, 08 Nov 2009 00:44:05 EDT http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23305549
Run iperf on both computers, one as client, one as server.

Let us know what you find.
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My place : »www.schettino.us]]> http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23305549 Sat, 07 Nov 2009 09:12:08 EDT http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23305378
Also, why do I get 700mbps sometimes and with the same file again I will only get 430 like I usually do?]]> http://www.dslreports.com/forum/Re-Why-is-gigabit-slower-23305378 Sat, 07 Nov 2009 07:05:50 EDT http://www.dslreports.com/forum/Why-is-gigabit-slower-23305336
Both computers are plugged into a D-link gigabit switch. I get 50mbps (yes, 50 megabits per second). If I plug both computers into my 10/100 router, I get the 100mbps minus the usual overhead. This switch has always done this on any gigabit capable computer, but why!? It should sustain at least 100mbps when using the gigabit switch if it goes that speed when connected to the 10/100 router.

Both computers also have WD Raptors, but I haven't tried benchmarking them yet.

The files I am testing are less than 1GB (around 150 to 600MB) when the speed is 50mbps on gigabit and 100mbps on the 10/100 router. When I test a 2GB file, I get a sustained 430mbps going from the IDE drive on the one computer to the 1TB drive on the other computer. I get a sustained 560 mbps going from the 1TB drive on the one computer to the Raptor on the other computer. It still shouldn't matter the size of the file or the hard drive, because it gets close to 100mbps when I use the router, but it only does 50 mbps on the switch.

I don't think it could be fragmentation either, because I should still get a sustained 100mbps+ with the switch if it did it with the router.

I should also note it doesn't "stay" at 50mbps with the switch. It fluctuates but the average is around 50mbps. It still goes above 100mbps sometimes, but rarely. Usually stays around 50mbps. With the router, it stays at the same speed.]]> http://www.dslreports.com/forum/Why-is-gigabit-slower-23305336 Sat, 07 Nov 2009 06:19:23 EDT