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jim
Posted: Wed Apr 09, 2008 10:46 am
 
I bought a Linksys WRT310N wireless N Gigabit router, 2 Linksys Gigabit 5
port switches, 1 Linksys 8 port Gigabit switch, 2 PCMIA to Ethernet Gigabit
ethernet cards by Belkin and 3 internal el cheapo 1 Gigabit full duplex
athernet cards and replaced all of my 10/100 stuff on my small network.

After getting everything set up, I expected throughput (copying a file)
speeds to be around 60MB/s...but (using Racoonworks free speed tester from )
I am getting readings of 7.5MB/s.

What could be causing such a slow response in copying a file on my new
Gigabit network?

I made sure that nothing was running on either system and no major network
traffic was happeing that I am aware of.

Thanks for your help!

jim
 
Kurt
Posted: Wed Apr 09, 2008 6:57 pm
 
jim wrote:
Quote:
I bought a Linksys WRT310N wireless N Gigabit router, 2 Linksys Gigabit 5
port switches, 1 Linksys 8 port Gigabit switch, 2 PCMIA to Ethernet Gigabit
ethernet cards by Belkin and 3 internal el cheapo 1 Gigabit full duplex
athernet cards and replaced all of my 10/100 stuff on my small network.

After getting everything set up, I expected throughput (copying a file)
speeds to be around 60MB/s...but (using Racoonworks free speed tester from )
I am getting readings of 7.5MB/s.

What could be causing such a slow response in copying a file on my new
Gigabit network?

I made sure that nothing was running on either system and no major network
traffic was happeing that I am aware of.

Thanks for your help!

jim



Make sure you are properly negotiating 1000/full duplex on the NICs. You
can force it (if it's a decent NIC) from the properties in device
manager. If the switches are managed, do the same at that end. Make sure
you are using cat6 cable for anything over about 100' (30 m), CAT5e for
anything shorter, all 8 wires are properly connected and paired,
end-to-end. Wall jacks wired correctly with approved cat6 jacks, patch
panel, etc.

The fastest I've ever seen Windows SMB transfer files is around 50MB/s,
doesn't mean it won't go faster, but that is my observation. Vista is
rumored to be even slower (and the "fix" improved it, but did not make
it as fast as pre-Vista OS's). Haven't tried Vista myself. Try an ftp
transfer to see if SMB is slowing you down.

When we went to gig on our LAN, speed improved by a factor of about 3.
My experience is that bandwidth (on a small 100Mb network) is rarely, if
ever, the problem. I'll just about guarantee you that any 100Mb switch
costing over $125 will provide 95+Mbps of throughput. Until you've
reached that saturation, upping the network hardware bandwidth will have
little effect.

Kurt
 
 
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