Expiring Today—Celebrate National IT Professionals Day with 3 months of free Premium Membership. Use Code ITDAY17

x
?
Solved

Network performance very slow

Posted on 2009-07-04
7
Medium Priority
?
313 Views
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?
0
Comment
Question by:nadish
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 2
7 Comments
 
LVL 8

Expert Comment

by:JT92677
ID: 24777747
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
0
 

Author Comment

by:nadish
ID: 24778542
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?
0
 
LVL 8

Accepted Solution

by:
JT92677 earned 750 total points
ID: 24778661
From Cisco troubleshooting:

"Duplex mismatch is a situation in which the switch operates at full-duplex and the connected device operates at half-duplex, or the other way around. The result of a duplex mismatch is extremely slow performance, intermittent connectivity, and loss of connection. Other possible causes of data link errors at full-duplex are bad cables, a faulty switch port, or NIC software or hardware issues."

For 1000 Mbit devices, it seems that you must use auto-negotiate to avoid some of the problems.  The switch will run this way by default, so here's what I'd try next:

Put your laptop back in auto-negotiate mode. Unplug the Cat-5 or Cat-6 cable that you're using, power off the switch, and power it back on. The switch does a form of basic "routing" of sorts, based on MAC addresses, so once it figures out how to hook one port to another, it kind of sticks that way.

When the switch is running, plug in the laptop (that is in auto-negotiate mode).

If this doesn't work, it might be the cable is not good (giving you various communications errors), or the driver in the laptop is not working that well, or the NIC driver on the 100 Mbps server.

Try the switch reset, then plug in laptop with autonegotiate ON, and hopefully the 100 Mbps server setting is also auto-negotiate, and last, a different ethernet cable.

Each time you make a change, "reboot" the switch (pull the power for a few seconds).

Jeff
0
Connect further...control easier

With the ATEN CE624, you can now enjoy a high-quality visual experience powered by HDBaseT technology and the convenience of a single Cat6 cable to transmit uncompressed video with zero latency and multi-streaming for dual-view applications where remote access is required.

 

Author Comment

by:nadish
ID: 24779768
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!
0
 

Author Comment

by:nadish
ID: 24779776
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???
0
 
LVL 5

Expert Comment

by:KETTANEH
ID: 24856891
what is your switch at home ?? the model ?
0
 

Author Closing Comment

by:nadish
ID: 31599753
I found out why the performance was slow. But I still have to downgrade settings manually to 100bps to get reasobale performance.
0

Featured Post

The Ideal Solution for Multi-Display Applications

Check out ATEN’s VS1912 12-Port DP Video Wall Media Player at InfoComm 2017. Kerri describes how easy it is to design creative video walls in asymmetric layouts and schedule detailed playlists ahead of time with its advanced scheduling feature.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Downtime reduced, data recovered by utilizing an Experts Exchange Business Account Challenge The United States Marine Corps employs more than 200,000 active-duty Marines with operations in four continents, all requiring complex networking system…
Trying to figure out group policy inheritance and which settings apply where can be a chore.  Here's a very simple summary I've written which might help.  Keep in mind, this is just a high-level conceptual overview where I try to avoid getting bogge…
Michael from AdRem Software explains how to view the most utilized and worst performing nodes in your network, by accessing the Top Charts view in NetCrunch network monitor (https://www.adremsoft.com/). Top Charts is a view in which you can set seve…
In this video you will find out how to export Office 365 mailboxes using the built in eDiscovery tool. Bear in mind that although this method might be useful in some cases, using PST files as Office 365 backup is troublesome in a long run (more on t…

719 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question