Gigabit LAN expected maximum throughput speed?

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hbk

94 posts

Master Geek

#36571 28-Jun-2009 20:19

Hello,

I have a D-Link gigabit router DGL-4100 and two PC's connected to it with onboard Realtek gigabit ethernet adaptors.

When transferring files between the PC's using FTP the fastest transfer speed I can get is 26MB/s.

Should it be faster? What would be the bottleneck? The integrated ethernet adaptors?

PC's have resonable specs, quad core, lot's of memory, SATA2 HDDs etc.

Cheers

redjet

299 posts

Ultimate Geek

#229048 28-Jun-2009 22:10

Hi there,

I dare say your hard drive are the bottleneck, although you should be able to get at little better than 26mbps.

Have a read of this article which will explain why hard drives are the common bottleneck in gigabit networks:
http://www.tomshardware.com/reviews/gigabit-ethernet-bandwidth,2321.html

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Ragnor

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#229055 28-Jun-2009 23:39

Agree hard drive speed with be the bottleneck most likely.

You could benchmark the drives in each system with hdtuen or crystaldisk.

richms

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#229067 29-Jun-2009 02:23

I have not seen over 30megabytes/sec between machines, whereas the 2 drives in one machine will go to about 60-65 on the windows 7 copy speed meter thing, and it doesnt seem to be cache since thedrive light goes off a couple of seconds after the dialog disappears.

Ahh esata ;)

Richard rich.ms

hbk

94 posts

Master Geek

#231124 5-Jul-2009 10:34

Cheers.

Tried HDTune and got an average transfer rate of 70.1MB/s.

I'll have a read through that article. First thing to try might be connecting the machines together directly to eliminate the router being the bottleneck.

muppet

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#231130 5-Jul-2009 10:58

If you want to see what sort of actual network capacity you can get between the two PC's, iperf is great for this.

http://sourceforge.net/projects/iperf/

If it shows really high speeds then you can start to look at your disk I/O and other things.

Audiophiles are such twits! They buy such pointless stuff: Gold plated cables, $2000 power cords. Idiots.

OOOHHHH HYPERFIBRE!

cr250bromo

222 posts

Master Geek

#231141 5-Jul-2009 11:58

setting your MTU to 9000 and ensuring RFC1323 is enabled will most likely help as well. On a PC at work that I couldn't get any better than 250mbit out of when doing an FTP transfer, I was able to get 800mbit+ using iperf which shows the hard drive to be the bottleneck as others have mentioned.

xpd

Geek @ Coastguard NZ
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#231182 5-Jul-2009 16:02

When I have LANs here we run via an 8 port gig switch and get about 40mbps on average via DC++.
HDD is the usual bottleneck tho as others have mentioned.

Gavin / xpd / FastRaccoon / Geek of Coastguard New Zealand

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