Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.os.linux.development.system > #606

Re: how to create a interrupt service function in c for real time linux operating system?

Show all headers | View raw

On Tuesday, 1 April 2014 13:10:45 UTC+2, Tauno Voipio  wrote:
> On 1.4.14 11:56, Hemanth Venkatappa wrote:
> 
> > On Thursday, 27 March 2014 16:30:30 UTC+1, Tauno Voipio  wrote:
> 
> >>>> On 26.3.14 10:46, Hemanth Venkatappa wrote:
> 
> >>
> 
> >>   >
> 
> >>
> 
> >>   >
> 
> >>
> 
> >>   > Where to write a interrupt handler and how to register with kernel in
> 
> >>
> 
> >> linux?
> 
> >>
> 
> >>   >
> 
> >>
> 
> >>   > Scenario : Client is sending a data and the server is receving the
> 
> >>
> 
> >> data from
> 
> >>
> 
> >>   > client via ethernet layer (udp). When the server receives a data from
> 
> >>
> 
> >> the client on the ip layer (kernel). It interrupts the kernel and kernel
> 
> >>
> 
> >> as to execute the data by the client, so I want to create a interrupt
> 
> >>
> 
> >> service function to catch the interrupt from the network service card.
> 
> >>
> 
> >>   >
> 
> >>
> 
> >>   > I can't write kernel modules (the kernel is not open) and you have
> 
> >>
> 
> >> real-time in
> 
> >>
> 
> >>   > user-space. However I can write code using RTLinux (real time linux)
> 
> >>
> 
> >> in kernel
> 
> >>
> 
> >>   > space and with kernel modules.
> 
> >>
> 
> >>
> 
> >>
> 
> >>
> 
> >>
> 
> >>
> 
> >>
> 
> >> Please explain what you are trying to achieve by catching the network
> 
> >>
> 
> >> interface interrupts. It is about the most silly place in the whole
> 
> >>
> 
> >> networking stack to catch for doing something allowed and useful.
> 
> >>
> 
> >>
> 
> >>
> 
> >> There are different hook positions in the network protocol stack, but
> 
> >>
> 
> >> for most of them, you need to have superuser privileges, for obvious
> 
> >>
> 
> >> security reasons.
> 
> >>
> 
> >>
> 
> >>
> 
> >> Doing anything in hardware I/O, including catching interrupts, is also
> 
> >>
> 
> >> considered such an activity that it needs superuser privileges.
> 
> >>
> 
> >>
> 
> >>
> 
> >> Your description on the 'openness' is contradictory - either you have
> 
> >>
> 
> >> the necessary privileges, or you don't have them.
> 
> >>
> 
> >>
> 
> >>
> 
> >> Try again to describe the ultimate goal of this exercise, so we can
> 
> >>
> 
> >> lead you to the correct direction.
> 
> >>
> 
> >>
> 
> >>
> 
> >> --
> 
> >>
> 
> >>
> 
> >>
> 
> >> -TV
> 
> >
> 
> 
> 
> (-- extra long lines truncated -TV --)
> 
> 
> 
> > how to get the interrupt time (timestamp) in kernel mode of real time linux?
> 
> >
> 
> > client- server communication - client is sender and server is receiver.
> 
> when the server receives the data on the ethernet interface(UDP) the kernel
> 
>   in the server is triggered. I am using real time LINUX on the server 
> 
> side.
> 
> server(i.e embedded pc target) is handling interrupts to trigger the 
> 
> embedded
> 
> pc target (conatining rt linux) to gain the attention to execute the newly
> 
> arrived data. I want to calculate the time in kernel as soon as the 
> 
> interrupt
> 
> occurs and send the response back to the client.
> 
> 
> 
> 
> 
> Could someone please help me ??
> 
> 
> 
> 
> 
> You still did not tell what for you are wanting the times. The response
> 
> gives the necessary boundary conditions for the responses.
> 
> 
> 
> Also, I did not understand what computers are in your network
> 
> connection. Two RT Linux machines? Is either a PC?
> 
> 
> 
> It seems to me that you have already fixed yourself to the idea of
> 
> timing the network interface interrupts. Do you have access to the
> 
> network drivers and their source code? Do you have the skills needed
> 
> to modify and compile a kernel driver?
> 
> 
> 
> If you want to measure the server latency from a request packet to
> 
> the corresponding response packet, IMHO, the simplest method is
> 
> to tap the network connection and grab the interesting traffic
> 
> with Wireshark. It will give the timing without any extra programming.
> 
> 
> 
> -- 
> 
> 
> 
> -TV

I am calculating the timestamp i.e time when the interrupt occurs and when it starts scheduling. The client is RTPROPC and server is real time linux.

Back to comp.os.linux.development.system | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-03-26 01:46 -0700
  Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-03-26 15:24 +0200
    Re: how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-03-27 00:25 -0700
      Re: how to create a interrupt service function in c for real time linux operating system? Joe Beanfish <joebeanfish@nospam.duh> - 2014-03-27 13:14 +0000
      Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-03-27 17:30 +0200
        Re: how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-04-01 01:56 -0700
          Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-04-01 14:10 +0300
            Re: how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-04-01 22:21 -0700
              Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-04-02 08:44 +0300
                Re: how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-04-02 05:27 -0700
                Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-04-02 17:50 +0300
                Re: how to create a interrupt service function in c for real time linux operating system? Hemanth Venkatappa <hemanthvenkatappa@gmail.com> - 2014-04-02 08:46 -0700
                Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-04-02 21:49 +0300
                Re: how to create a interrupt service function in c for real time linux operating system? Richard Kettlewell <rjk@greenend.org.uk> - 2014-04-02 23:13 +0100
                Re: how to create a interrupt service function in c for real time linux operating system? Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2014-04-03 08:59 +0300

csiph-web