Re: How to debug throughput issues?

From: hariprasad kelam <hariprasad.kelam@gmail.com>
To: Subhashini Rao Beerisetty <subhashbeerisetty@gmail.com>
Cc: kernelnewbies <kernelnewbies@kernelnewbies.org>
Subject: Re: How to debug throughput issues?
Date: Wed, 26 Jun 2019 11:17:23 +0530	[thread overview]
Message-ID: <CACFYQXPQ7yyo5RNwpxwwU2vViGwYhktnhdUzVhemEDWaFR=3Yw@mail.gmail.com> (raw)
In-Reply-To: <CAPY=qRRKzYYT6r55KgMhQGvMAjqg0TNEGik29y7NE=gnpUtQhw@mail.gmail.com>

[-- Attachment #1.1: Type: text/plain, Size: 2191 bytes --]

Hi subhashini,

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

> On Wed, Jun 26, 2019 at 7:44 AM Hariprasad Kelam
> <hariprasad.kelam@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
> > >
> > > _______________________________________________
> > > Kernelnewbies mailing list
> > > Kernelnewbies@kernelnewbies.org
> > > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>

[-- Attachment #1.2: Type: text/html, Size: 3502 bytes --]

[-- Attachment #2: Type: text/plain, Size: 170 bytes --]

_______________________________________________
Kernelnewbies mailing list
Kernelnewbies@kernelnewbies.org
https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies