Prioritizing bluetooth devices?

[Eric Anderson]

On 02/17/07 22:05, Maksim Yevmenkin wrote:
> On 2/16/07, Eric Anderson <anderson at centtech.com> wrote:
> 
> [...]
> 
>>>> 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.
> 
> did you notice if the system's interrupt load was high?
> 
>>> 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).
> 
> it is csr chip based daughter card that looks like usb device, is it not?
> 
> thanks,
> max


I don't know about the 'csr chip' part, but yes, it looks like an 
internal usb device.

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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