Re: OPP throughput is low in ubuntu 18.04

[Amit K Bag <amit.k.bag@intel.corp-partner.google.com>]

Hello Luiz,

I tried to test with your patch linux to linux which will use L2CAP
but still see the same low throughput.

On Fri, Feb 14, 2020 at 7:51 AM Amit K Bag
<amit.k.bag@intel.corp-partner.google.com> wrote:
>
> Hello Luiz,
>
> I am not sure what changes in kernel causing low throughput. If I get
> any clue I will let you know.
> I wil lalso test your patch with linux - linux and update the result.
>
> On Fri, Feb 14, 2020 at 6:18 AM Luiz Augusto von Dentz
> <luiz.dentz@gmail.com> wrote:
> >
> > Hi Amit,
> >
> > On Thu, Feb 13, 2020 at 3:32 AM Amit K Bag
> > <amit.k.bag@intel.corp-partner.google.com> wrote:
> > >
> > > Hello Luiz,
> > >
> > > I tested with the patch you have mentioned but not getting any better
> > > throughput.
> > > Please have a look at the log attached.
> > >
> > > We are using below configuration for linux
> > > - Kernel : 4.19.102
> > > - OS : ubuntu 18.04.2 LTS
> > > - Bluez -5.48
> > >
> > > For other machine we are using windows
> >
> > I think there is some work to be done to work with RFCOMM since we are
> > only doing this for L2CAP, I will have a look later this week, btw
> > have you look into any difference we may have between these kernels?
> > Or actually in what combination they appear because there could be an
> > isolated problem in either the kernel or the userspace changes.
> >
> > > On Mon, Feb 10, 2020 at 11:03 PM Luiz Augusto von Dentz
> > > <luiz.dentz@gmail.com> wrote:
> > > >
> > > > Hi Amit,
> > > >
> > > > On Mon, Feb 10, 2020 at 3:20 AM Amit K Bag
> > > > <amit.k.bag@intel.corp-partner.google.com> wrote:
> > > > >
> > > > > Hello All,
> > > > >
> > > > > I am tring to test the OPP throughput in linux.
> > > > > I transferred between 2 machines having ubuntu 16.04 with bluez
> > > > > version 5.44 in that I am getting 1.4mbps speed.
> > > > >
> > > > > Kernel : 4.14.13
> > > > > OS : ubuntu 18.04.2 LTS
> > > > > Bluez -5.44
> > > > >
> > > > > I am using a 12 MB of audio file.
> > > > > But the same file when I transferred between  2 machines having ubuntu
> > > > > 18.04 the speed is significantly reduced.
> > > > >
> > > > > Kernel : 4.18.0-15-generic
> > > > > OS : ubuntu 18.04.2 LTS
> > > > > Bluez -5.48
> > > > >
> > > > > Could someone tell me why its reduced in ubuntu 18.04
> > > >
> > > > I don't think we change anything on Obexd related to that so perhaps
> > > > it is something related to the L2CAP MTU? We could try setting the MTU
> > > > to 0 so it automatically picks the matching MTU if you do have the
> > > > following patch applied to your kernel:
> > > >
> > > > Bluetooth: Auto tune if input MTU is set to 0
> > > >
> > > >
> > > > --
> > > > Luiz Augusto von Dentz
> >
> >
> >
> > --
> > Luiz Augusto von Dentz