Re: [Bluez-users] Bluetooth connection too slow

[Marcel Holtmann <marcel@holtmann.org>]

Hi Mario,

> I recently bought a Bluetooth 2.0 EDR USB adapter (Trust, BT-2200Tp),
> because I wanted to try it out with my new Motorola E1070 (UMTS phone).

you need EDR on both sides to profit from it.

> I tried it out with my Ubuntu linux. The device has been recognized
> properly. Then I tried the Internet connection (with UMTS you can have
> more than 30 kBytes/s). Unfortunately all I could see was a transfer
> rate (taken with wget downloading the kernel sources from a fast mirror)
> of about 9 kB/s. I also tried to do the same with Windows XP and there
> the transfer rate reached about 32 kB/s!! I did the same several times
> and all the times I had the same results.
> Furthermore, I tried to do the same under Linux with a USB connection,
> and I'm getting 32kB/s as well. This brought me to think the bottleneck
> is in the BT connection.
> 
> This is how I'm setting the BT connection:
> $ sudo hcitool cc --role=m 00:0E:A1:45:1F:AE
> $ sudo hcitool auth 00:0E:A1:45:1F:AE
> $ sudo rfcomm bind 00:0E:A1:45:1F:AE
> $ sudo ln -sf /dev/rfcomm0 /dev/modem

The two hcitool commands are not needed. RFCOMM can create the piconet
by itself.

> To dial I'm using exactly the same procedure as when using the USB
> connection (with kppp).
> 
> I'm wondering if I need to tweak some parameter of the bluetooth
> connection. hciconfig gives me many info but I don't know how to
> interpret them and what options to give (where can I find
> documentation?).

If you reach 32 kB/s then this is a good result. With Bluetooth prior
EDR you will reach max something around 80 kB/s, but this is not really
doable with PPP in between. The bottleneck can also be the UART inside
your mobile phone.

Regards

Marcel




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