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

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Ultimate Geek
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#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.

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cr250bromo

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#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.

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xpd

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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.

XPD / Gavin

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