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Network performance very slow

nadish
nadish asked
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Last Modified: 2012-05-07
I backup my data from my my HP 8710w laptop using Second Copy. The laptop has a Gigabit NIC. OS is Windows Vista Business.
At the office the Second Copy & the NIC perform at Gigagbit speed.
When I get home the same backup takes 10 times as long  (even though I have a Gigabit Netgear switch).

The only way I have been able to speed up the backup is to downgrade the NIC driver to operate at 100MBps Full Duplex.
What's going on? How do I fix it?
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Commented:
You left out a description of the device on the other side of your Netgear switch.  Is it hooked up for 1000 mbit ?

If not, the switch is having to do speed switching, packet store and forward from devices operating at different speeds is not a great way to run a switch.

At the office, everything may be Gigabit compatible, but at home, maybe not.

Aside from the laptop, what else is hooked to your Gigabit Netgear switch? Or better, what is the device handling your backup storage?

Jeff

Author

Commented:
Jeff,
Good questions. The Switch is a Netgear GS116 (which is a gigabit switch). The destination device is a 100Mbps server.
My  HP 8710w laptop is normally set to Auto-negotiation. But at home this results in Second Copy times in the HOURS (terrible performance).
Only by switching to 100Mbps Full Duplex can I get a reasonable performance.
So maybe the better question is; Why does auto-nogtiation fail so miserably in this situation?
Commented:
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Author

Commented:
Jeff,
Your comments really got me thinking. So I did some tests with a 262Mb file through Windows Explorer.

T's machine to Server : 50 secs
Server to T's machine : 30 secs


HP 8710w to Server : Estimated by Win Explorer at 9 minutes (gave up after 2 minutes)
Server to HP 8710w : 37 secs

So it would seem that upload to the server is the ONLY issue.
Following your procedures with auto-negotiate on + a new cable + switch reboot didnt improve things.

What do above tests tell you?
Bloody mystery to me!

Author

Commented:
I thought I'd one more test with Auto-negotiate off and NIC set to 100Mbps Full Duplex

HP 8710w to Server : 40 secs

So no question that auto-negotiate is the culprit.
BUT WHY???

Commented:
what is your switch at home ?? the model ?

Author

Commented:
I found out why the performance was slow. But I still have to downgrade settings manually to 100bps to get reasobale performance.
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