Prioritizing bluetooth devices?

[Eric Anderson]

On 02/16/07 17:37, Maksim Yevmenkin wrote:
> Eric,
> 
>> I have just set up my Treo 700p using bluetooth and kpilot to sync
>> (thanks Bruce/Maksim!!!!).  I notice that when I'm doing a backup of my
>> palm and it's downloading a ton of stuff, my bluetooth connection is
>> jammed full, so my bluetooth mouse is slow/lags.  I don't have a
>> bluetooth keyboard, but if I did (and if it worked), then I'm certain it
>> would be present there too.
>>
>> So, my question is: is it possible to prioritize the bluetooth profiles
>> so that HID gets priority over things like serial, LAN, etc?
> 
> in theory, this should not be happening, because each bluetooth slave
> has reserved slots in which it can transmit data. also bluetooth hid
> devices usually set "quality of service" parameters on bluetooth link.
> 
> so, the problem could be either in the freebsd bluetooth code itself
> (i.e. it uses very simple packet scheduler that might not behave very
> well under load) or in packet scheduler in the device's "link
> manager", i.e. firmware.

The system was idle (CPU-wise) but I had the bluetooth link slammed 
transferring the entire contents of my palm (about 50MB).  I've never 
had a problem otherwise, even when keeping both CPU's (this is a Core 2 
Duo system) hammered.  As soon as the transfer stopped, mouse was again 
responsive.


> other than setting "quality of service" parameters on bluetooth link
> and/or forcing device to use only packets of certain size (i.e. 1,2 or
> 3-slots, which, btw, likely to reduce throughput) i doubt there is
> anything else (standard) that can be used to prioritize bluetooth
> profiles.
> 
> if you can, please try to switch to bluetooth 2.0 dongle (if you have
> not already)

As far as I know, this is a 2.0 dongle already (came with my laptop - 
Dell D820, so it's built in).

Eric



-- 
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Eric Anderson        Sr. Systems Administrator        Centaur Technology
An undefined problem has an infinite number of solutions.
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