Date: Fri, 16 Feb 2007 23:14:31 -0600 From: Eric Anderson <anderson@centtech.com> To: Maksim Yevmenkin <maksim.yevmenkin@gmail.com> Cc: "freebsd-bluetooth@freebsd.org" <freebsd-bluetooth@freebsd.org> Subject: Re: Prioritizing bluetooth devices? Message-ID: <45D68F37.7040105@centtech.com> In-Reply-To: <bb4a86c70702161537s31097db1g488213cf739ab80f@mail.gmail.com> References: <45D5F027.7060401@centtech.com> <bb4a86c70702161537s31097db1g488213cf739ab80f@mail.gmail.com>
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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 -- ------------------------------------------------------------------------ Eric Anderson Sr. Systems Administrator Centaur Technology An undefined problem has an infinite number of solutions. ------------------------------------------------------------------------
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