[Bluez-users] Transfer speed of a billionton class 1 USB dongle

[Bluez-users] Transfer speed of a billionton class 1 USB dongle

[Xinlei Roland Wang]

I am using BlueZ with a billionton class 1 USB dongle.
I found its upload speed (to a Nokia 6600) is slow
(around 5-10K/s), and its download speed is pretty
fast (around 30K/s). I google the web and found that
bluetooth has two transmission mode: asymmetric and
symmetric. I think my dongle is in asymmetric mode and
I wonder how to switch it to symmetric mode, as I need
fast upload speed.

Thanks and regards,

Roland


		
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Re: [Bluez-users] Transfer speed of a billionton class 1 USB dongle

[Marcel Holtmann]

Hi Roland,

> I am using BlueZ with a billionton class 1 USB dongle.
> I found its upload speed (to a Nokia 6600) is slow
> (around 5-10K/s), and its download speed is pretty
> fast (around 30K/s). I google the web and found that
> bluetooth has two transmission mode: asymmetric and
> symmetric. I think my dongle is in asymmetric mode and
> I wonder how to switch it to symmetric mode, as I need
> fast upload speed.

if the link manager chooses the wrong packet types then this can happen.
Please run "hcitool info ..." and see what chip is in that phone. I bet
it is an old Nokia chip and then this can happen. However you might
wanna play with HCI_MAX_BULK_TX and HCI_MAX_BULK_RX constants inside the
hci_usb.h source code. I don't know if that helps, but it is worth a
try.

Regards

Marcel




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