Prioritizing bluetooth devices?

[Maksim Yevmenkin]

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