Date: Sat, 17 Feb 2007 20:05:18 -0800 From: "Maksim Yevmenkin" <maksim.yevmenkin@gmail.com> To: "Eric Anderson" <anderson@centtech.com> Cc: "freebsd-bluetooth@freebsd.org" <freebsd-bluetooth@freebsd.org> Subject: Re: Prioritizing bluetooth devices? Message-ID: <bb4a86c70702172005u8c0b3e4g2b868c9d19656d04@mail.gmail.com> In-Reply-To: <45D68F37.7040105@centtech.com> References: <45D5F027.7060401@centtech.com> <bb4a86c70702161537s31097db1g488213cf739ab80f@mail.gmail.com> <45D68F37.7040105@centtech.com>
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On 2/16/07, Eric Anderson <anderson@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
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