How to debug throughput issues?

[hariprasad kelam]

Hi subhashini,

On Wed, 26 Jun, 2019, 10:56 AM Subhashini Rao Beerisetty, <
subhashbeerisetty at gmail.com> wrote:

> On Wed, Jun 26, 2019 at 7:44 AM Hariprasad Kelam
> <hariprasad.kelam at gmail.com> wrote:
> >
> > On Tue, Jun 25, 2019 at 10:26:54PM +0530, Subhashini Rao Beerisetty
> wrote:
> > Hi  Subhashini,
> >
> > Please see inline,
> > >  Hi All,
> > >
> > >  I’ve two Bluetooth dongles and connected to two Linux
> > > systems(hostname1, hostname2). I’ve a test executable and it creates a
> > > BT link does the file transfer and calculates the throughput.
> > >
> > Are these dongle supports classic mode or Ble?
> It supports classic mode.
>
> > Which profile are you using to establish connection between these two? (
> > PAN, ..etc)
> > >  I repeated the same test with the same BT dongles on another
> > > different Linux systems(hostname3, hostname4), here I’m getting less
> > > data rate.
> > >
> > After inserting dongles to host are you getting serial interface
> > /dev/tty* or hci interface ?
> Using serial interface /dev/tty*
> If it's inbuilt serial profile ..kernel simply creates serial interface.
>
    You may focus on serial driver .




> If its hci interface ,you can use hcidump to see packets  and check MTU
> > size
> > > Here first I want to narrow down whether the issue is below device
> > > driver level or above device driver level and where the bottleneck is?
> > > which tools will help me to debug this kind of issue?
> > >
> > I think before jumping into driver level ,its better to ensure all
> > bluetooth parameters are same on both the setups.
> Except the kernel version(hostname1 & 2 are having same kernel and it
> differs with hostname3 & 4 kernel version) rest all other stuff is
> same. So I'd like to know how to know which part of kernel mode
> functions causing more delay and any tools are there to debug these
> issues?
>
> >
> > Thanks,
> > Hariprasad k
> > > Thanks
> > >
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>
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