[Bluez-users] Unstable acl throughputs

[Bluez-users] Unstable acl throughputs

[Sean Loh]

Hi

I have set up a pan between 2 computers with bluetooth
usb adapters. From the mailing lists, I understand
that to get assymetric data throughputs, we modify the
hciconfig hci0 ptype to whatever we want. For example,
the best assymmetric throughput would involve running
hciconfig hci0 ptype DH5 on one computer and hciconfig
hci0 ptype DH1 on the other computer. Am I right?

When I do this and I measure the udp packet
throughputs, the throughputs I get are all over the
place. For an assymetric connection of DH3/DH1. I can
get throughputs from the DH3 link computer to the DH1
computer of 650000 bits per second. Remember, this is
in the pan profile, sending udp packets. Should I be
getting this throughputs?or is there something amiss?

The DH1 computer is not sending any information out,
so does that really matter. Could it be because of
that I'm getting such high throughputs on the DH5
computer?

Any help greatly APPRECIATED!!!


		
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Re: [Bluez-users] Unstable acl throughputs

[Marcel Holtmann]

Hi Sean,

> I have set up a pan between 2 computers with bluetooth
> usb adapters. From the mailing lists, I understand
> that to get assymetric data throughputs, we modify the
> hciconfig hci0 ptype to whatever we want. For example,
> the best assymmetric throughput would involve running
> hciconfig hci0 ptype DH5 on one computer and hciconfig
> hci0 ptype DH1 on the other computer. Am I right?

please read the mailing list archive again and understand my posts about
the packet types. The host can't choose the right packet type. So let
the link manager do this job and allow it to use whatever packet type it
wants.

> When I do this and I measure the udp packet
> throughputs, the throughputs I get are all over the
> place. For an assymetric connection of DH3/DH1. I can
> get throughputs from the DH3 link computer to the DH1
> computer of 650000 bits per second. Remember, this is
> in the pan profile, sending udp packets. Should I be
> getting this throughputs?or is there something amiss?
> 
> The DH1 computer is not sending any information out,
> so does that really matter. Could it be because of
> that I'm getting such high throughputs on the DH5
> computer?

Actually how would you now what kind of packet types are used on the
baseband? Do you have a protocol analyzer? If yes, look at it and keep
in mind that DM1 is always allowed and required.

Regards

Marcel




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