Try disabling auto tuning on your vista machines. Your router might not like it.
From an admin command prompt
netsh int tcp set global autotuninglevel=disable
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Slow file transfer between computer in wireless home network
I have a home network setup. I have three desktops and two laptops, all connected wirelessly. Two of them have D-Link N PCI cards and the rest have G. I have a D-Link DIR-655 Wireless N Router connected to the Internet via cable modem. My Internet speed seems to be great. When I run a test, my download is around 5 MB and my upload is around 300 KB, which is fine with me.
My problem is when I transfer files between the computers it is very slow (400-700 KB/s). My router is in the middle of my house in my kitchen on top of the cabinets. My house is small and my signal strength is great. To keep this simple, I will just discuss two computers. Both have Vista and both have D-Link DWA-552 XtremeN Desktop Adapters. I have tried moving my wireless router out away from wall in my kitchen with no changes. I tried a different router (Belkin N1) but no changes (maybe a slight improvement, but not much).
I am transfering file by copying them in Windows Explorer between a mapped network drive (the C: drive on the other computer) and my local C:. I used a tool called ViceVersa Pro to transfer files and it took about the same amount of time and displayed the speed which ranged between 400 and 700 KB/s (which is where I came up with the numbers I used earlier). I used a tool called Speed Meter Pro from Network Magic and it says my utilization when transfering files is 2%.
What is going on? I have tried everything. Any tools I can use to troubleshoot or ideas?
Thanks
Doug
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Answers
I was just playing with setting everything to G this morning... Might have helped a little, but still below 1 GB/s. I tried disabling auto tuning a few days ago but didn't make a difference.
One thing I noticed... I hooked up my laptop to the router with a wire. The transfer speed between either of the two computers and the laptop approaches 2 GB/s but between the two computers themselves it's still less than 1 GB/s. Is that because the bandwidth of the wireless router is cut in half when transfering wireless to wireless? So the bandwidth is shared among the connected computers?
I think I might trying purchasing all new equipment for G only (forget about N). I really don't need anything faster than 10 GB/s or so... just tried N to increase my range (before I moved my router to the center of the house).
I wonder if interference is my problem. How can I check for interference? Are there any programs that can do that?
Thanks
Doug
Here's a link to look at... check out your firmware, it might help you out some...
http://www.pcworld.com/pro
Well, here are some things to take into consideration..
802.11 b,g, and n all operate at 2.4 ghz. So you might have some things such as cordless phones which could present at least a bit of a problem. (You can get cordless phones that operate at 900 mhz or 5.8 ghz, which will mitigate that issue). Bluetooth devices are another potential source. Microwaves can also be a potential source of interference. Other wireless LANs using the same channel as yours can interfere as well. Here's a link that you can take a look at to help you out with trying to minimize what can interfere.. http://www.wi-fiplanet.com
(Note: It's a very old article, so ignore the comment concerning using 802.11a [it never caught on]. However, many of the ideas in the article are still applicable and very relevant)
Transfers occur more slowly in mixed mode. Based on your wanting the higher transfer rate, I'd upgrade to all N cards, then set your router to operate N only for the best performance. (Hopefully the computers are the only wireless devices on your network)
The further away from the router you are, the lower your speed will be. (Walls will also contribute to this drop in data rates)
802.11n has a theoretical maximum of 300 mbps, but also keep in mind that people will never experience speeds like that in real world usage. But to answer your question in regard to sharing, the answer is yes in terms of bandwidth availability when you're connected to the network.
You might have a look at NetStumbler. A good Windows based wireless LAN sniffer. This tool will allow you to see what other wireless LANs are in your neighborhood. If you get to many on the same channel, it can degrade your performance.
..and everything masnrock states!
NetStumbler:
http://www.netstumbler.com
The latest 4.0 version is now out. Free
John
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by: masnrockPosted on 2007-12-09 at 03:19:13ID: 20436668
Is there a different in network settings between those two computers and the other three?
Also, is your router running in mixed mode? One thing you might try (even with as odd as it sounds) is to run in G only mode. Or you can configure those two NICs to operate in G only mode.