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MBP to MB wirelessly questions

post #1 of 9
4/26/07 at 11:43am
Thread Starter 
im transfering a few files, and just have some questions.

i have a mbp, and a mb. both with 54g airport cards.

anyways, if i click on the airport icon in the menu, i can create a computer to computer network. after setting up all the share stuff, i get a transfer rate of about 3MBps. about 10ft in between laptops. This seems a tad slow, no?


second scenario, and the most favorable. Connecting each to my wifi router, wrt54gL with ddwrt, wirelessly. i get transfer speeds of about 0.5 MBps. this seems super slow. both have a 54g connection, and excellent signal. what gives? even with the wifi router in the same rooom, its this slow. ive turned it to wifi-g only, and it has wpa2 AES/TKIP initiated.

just looking for some advice.

i know im not gonna see 54mbps, or like 6.5 MB/s from this thing, but using it leaves a lot to be desired! almost 6MBps in fact


the files are around 1.5GB each, so they arent a bunch of small files.

ive also tried transfering through Bluetooth, which would be nice, but cant seem to get more than 95KB/s. this is with both machines next to eachother. seems very slow for BT 2.0 with EDR
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post #2 of 9
4/26/07 at 2:44pm
I don't know much about networking so I don't know what to tell you there but what about doing a firewire network?
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post #3 of 9
4/26/07 at 3:20pm
Thread Starter 
if im in firewire cable range, i might as well just do an ethernet connection

really just trying to see what the wifi/BT can really do.

my numbers seem very low.
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post #4 of 9
4/26/07 at 7:12pm
I'm not real sure what the speeds are on BT exactly, but it is a small device network thing... so transferring stuff to and from your phone, connecting headsets and the like. Transferring large files over bluetooth is like opening the file in textedit, grabbing the binary code for the file, printing it out, and then retyping it into the other machine.

As far as the wifi goes. You have to remember that you are reading the file from the hard drive (a bottleneck), transferring it to RAM, sending it through the wireless card, into the other wireless card, transferring it to RAM and then writing it to the other hard drive (another larger bottleneck). Plus all the other OS activities in between.

54Mb/s is a theoretical max, and i'm not real sure if anybody gets those even under ideal conditions.
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post #5 of 9
4/27/07 at 5:11pm
Thread Starter 
i would think that both new macs could handle more than 0.5MB/s max on the wifi.

that seems very low.

very understood about your concept of "from hd, to ram, and so ...." but i just dont see it being that extremely low.

any speed testers i can use besides my stop watch?
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post #6 of 9
5/1/07 at 11:33am
The typical data rate for 802.11g is usually said at 24 Mbps... I believe that's Megabits per second. Which would translate into the 3 MBps you're seeing (3 Megabytes per second)

Sadly wireless protocols add a lot of overhead, esp to deal with a free medium like air. There's a lot to prevent data signals from colliding. You add things like security protocol, there's even more overhead and thus less actual data throughput.


Bluetooth 2.0 is only maxed at 3.0 Mbps.. usually rated around 2.1 Mbps real usage. That's about 700 KB/s though, so perhaps there is some other issues with the Bluetooth
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post #7 of 9
5/1/07 at 8:55pm
Thread Starter 
well 0.5MB/s is real low for a wifi-g connection with the books 1 foot away from eachother isnt it?

there are no cell phones, cordless phones, or microwaves in use while testing this.

i would just think it would be a litle higher.

what can i use to see the throughput?
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post #8 of 9
5/8/07 at 2:44am
quick question. What are you using to measure your transfer rates?

Also, are you sending through instant messenger, or by mounting a network drive?
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post #9 of 9
5/8/07 at 10:21am
Thread Starter 
mouting a network drive.

ive used a stopwatch, which is probably one of the most accurate ways i think, and ive used apple network activity monitor.

0.5mb/s is always what i come up with for through the router i have, wrt54gL ddwrt 23. 1MB/s direct "connect to server" or mac to mac
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