bluetooth 2.0 is extremely slow

[Harald Hoyer]

Mike Cronenworth wrote:
> -------- Original Message  --------
> Subject: Re: bluetooth 2.0 is extremely slow
> From: Mike Cronenworth <mike at cchtml.com>
> To: mike at cchtml.com, Development discussions related to Fedora 
> <fedora-devel-list at redhat.com>
> Cc: Bastien Nocera <bnocera at redhat.com>
> Date: 04/09/2008 09:53 PM
> 
>> OK,
>>
>> I applied the attached patch. I'm putting this up for review, and any 
>> suggestions (should this be posted somewhere else, etc.). My transfer 
>> time went from 40 seconds to 10 seconds. It now matches Windows XP 
>> performance. Just add it to the RPM spec like the existing patches.
>>
>> Regards,
>> Michael
>>
> 
> After further testing I've created a proper patch. These are my results 
> based on the attached patch. Each MTU was tested twice using "open_push" 
> as the receiver program and using the "gnome-obex-server" program.
> 
> Bluetooth 2.0 - 1070k file transfer from phone to computer
> 1024 MTU - 40 seconds (default MTU)
> 8192 MTU - 20 seconds
> 16384 MTU - 10 seconds
> 32768 MTU - 11 seconds
> 65535 MTU - 12 seconds
> 
> Bluetooth 1.1 - 1070k file transfer from phone to computer
> 1024 MTU - 52 seconds (default MTU)
> 8192 MTU - 30 seconds
> 16384 MTU - 34 seconds
> 
> I revised the patch to not change the minimum MTU. It had no effect on 
> speeds. 16k seems to be the sweet spot. This makes *huge* differences 
> for both 1.1 and 2.0. It seems no one with OpenOBEX bothered to test 
> transfer speeds... kind of unsettling. I will make a Bugzilla report and 
> join the bluez list later today.
> 
> Regards,
> Mike
> 

Does using OBEX_SetTransportMTU() help?
http://www.zuckschwerdt.org/apidocs/r323.html