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Q for the PC geeks
Old 05-19-2006, 01:24 AM   #1 (permalink)
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This is really odd. In the last couple of days I've had to copy shoot files from my laptop to a desktop using a wireless connection (located about 4 feet from the wi-fi router) at 54 Mpbs and tonight it took over 3.5 hours to move 18gb. Does that sound remotely normal? I think I could burn a bunch of DVDs faster than that. I seem to recall moving files a lot faster than that many times, but I never clocked it before because it seemed like a reasonable time. My new Sony laptop is a 1.73ghz with 1.5mb RAM and the Dell desktop is a 3.4ghz with 2gb RAM and lots of empty disk space, and when I did this yesterday, I got (I think) the same speed using a wired ethernet connection. I'm not even sure where to start looking to solve this. Anyone have any idea where the bottleneck might be? (and nothing else is being done on these computers at the same time). All my computers are networked using the same wireless router, although the desktops (2) are hardwired to the router, only the laptop connects wirelessly, and files do seem to copy much faster from wired desktop to wired desktop. Could there be some setting in the laptop (wireless or not) that is limiting the transfer speed?

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Re: Q for the PC geeks
Old 05-19-2006, 03:01 AM   #2 (permalink)
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Well, that translates, unless my after buffalo wild wings had a couple more beers than normal math is worn...12 kilobits per second...my wireless is 108kilobits per sec...yes...thats slow...something is off...wait


I need another beer and my snack is beeping in the micro-wave...

ok..sorry for joking, yes that sounds a bit slow but I cannot hazard to guess what could be your bottleneck...is your speed the same if you direct cable to tohe router?

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Re: Q for the PC geeks
Old 05-19-2006, 03:43 AM   #3 (permalink)
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That does sound a bit slow. A lot of things can slow wireless down, though - interference, echoes, etc. You might want to try doing the transfer again over a wired connection to see if it was the wireless.

BTW: You can highlight the little wireless icon in the system tray to see what the quality of your wireless connection is, assuming you are using WinXP. You can also bring up the status of the connection, which will give you an idea of how it is flowing. And Task Manager's Networking tab might be useful, too.

Other possible bottlenecks are: slow writing on the receiving machine's hard drive - is it formatted NTFS or FAT32? Is the hard drive fragmented? Does the receiving machine have plenty of free RAM (paging would wreck your receiving speed)?

I went to the trouble of finding a laptop with gigabit wired Ethernet, and my house is wired for gigabit, so I always use a wired connection. It makes a difference, especially when we are talking about gigabytes of images.
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Re: Q for the PC geeks
Old 05-19-2006, 05:45 AM   #4 (permalink)
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Hi Andy ...

You wanted a "geek" reply , so here it is :

18 GByte x 8 = 144 Gbits
144 Gbits x 1024 = 147456 Mbits you have to move.

Your router has a MAX of 54 Mbits/second , but the overhead on encrypted WLAN is said to be up to 50 %!
So you actually have ,lets say 30 Mbits - if everything works 100%.

So (147456 Mbits) / (30 Mbits/s) = 4915 seconds or 1,3 hours would be your actual MAX performance...

You have 3,5 hours so this is actually poor performance (less than half of the possible speed).

Now , if I look at my setup (which is like yours) I see the following things which make MY connection slower:
- automatic adaption of the speed , including new training (maybe because of the "G+" standard)
- I have never seen 54 Mbit/s , not even at a distance of a couple of feet - normally I have about 25 Mbit/s

And THAT would translate to your measured performance !

My advice: use a cable an 100 Mbit/s ethernet for such transfers

CU
Peter
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Re: Q for the PC geeks
Old 05-19-2006, 09:30 AM   #5 (permalink)
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Not an expert, but is'nt there a limit on the upload speed....

I can download at a 2M, but can only upload at 256K, and as far as I know on normal broad band in the UK that's the normal rates!!!

Unless you have a different broadband setting possibly T1 or T2 or something like that.

UK side we all hope to be running at 8M download before the summer is over....

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Re: Q for the PC geeks
Old 05-19-2006, 10:29 AM   #6 (permalink)
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The transfer should go as fast as it's physically possible, in this case 54mb/s. If your running any anit-virus software on the target pc and its set to scanning everything this will slow down the process as well. I also would suggest to use a cable or back up frequently. Wireless is nice if your working on office documents and browsing the internet. But if your transfering 18gb through the air at 54mb/s its going to take a while. All 4 of my PCs are wired. No plans on going wireless.
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Re: Q for the PC geeks
Old 05-19-2006, 12:37 PM   #7 (permalink)
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Three things come quickly to mind.

First, is it possible that virus protection software on one or both machines is automatically scanning incoming/outgoing files. This could slow down transfer.

Second, and I found this on a friends computer, could you have automatic updates enabled in either windows or some other application that is sharing your wireless bandwidth. My friends laptop was running Windows XP with SP1. Whenever he turned it on, it was automatically downloading SP2 from the windows update site. He rarely had his laptop on for more than an hour, so he would turn it off before any update was complete, and then it started all over again the next time he turned it on. Windows update was using 1/2 of his wireless bandwidth and slowing all other wireless connections down.

Third, do you have encryption enabled on your wireless router? I understand that will slow down transfer as well, but not to the degree you seem to be experiencing. Turning off encryption or lowering the encryption level to 128 or 64 bit might help increase speed some.

G
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Re: Q for the PC geeks
Old 05-19-2006, 01:23 PM   #8 (permalink)
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food for thought... my wife answers the phone, I loose my WiFi connection (or it becomes patheticly slow).

Any change there was a 2.4 gig phone in use in the area?
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Re: Q for the PC geeks
Old 05-19-2006, 04:59 PM   #9 (permalink)
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Quote:
Originally Posted by Princy
Not an expert, but is'nt there a limit on the upload speed....
I can download at a 2M, but can only upload at 256K, and as far as I know on normal broad band in the UK that's the normal rates!!!
Unless you have a different broadband setting possibly T1 or T2 or something like that.
UK side we all hope to be running at 8M download before the summer is over....
Regards Princy
You are thinking about uploading to a website over ADSL. This question is about a transfer between two PCs in the same building - different situation.
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Re: Q for the PC geeks
Old 05-20-2006, 02:17 AM   #10 (permalink)
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My head is hung in shame, I realised after I had posted it and read the posts again. So sad, I had hoped no one noticed GRIN..... Well it was my nap time. You reach a certain age and start missing things.
Sorry group. I read twice from now on...
Regards Princy
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