Operating system latency Issues

Hi all,

  For some time I have been testing gua against other SIP user agents like
  linphone, Kphone and Xlite.

  During these tests I have found a great audio jitter (delay variation)
  during the same call in gua reception side. At the beginning of the call
  the delay is about several milliseconds but little by little it is
  increasing up to more than 3 seconds and suddenly it turns back to the
  original delay and goes on increasing again and so on. I have tried to
  know what was going on and I have found that the cause of the problem is
  the operating system latency which obviously is higher when gua is run
  from the Xs environment, where the latency can be up to 150 milliseconds
  when I run the system monitor at the same time.

  As a result of this conclusion, I have tried creating a version of gua
  that configure real-time scheduling priority at the beginning of this
  application and all the problems above have disappeared. The modification
  that I made in gua version 1.5.0 consisted only in few lines of c code to
  configure real-time scheduling priority for the application at the
  beginning of itself.

  First of all, I would like to know if any of you have suffered this
  jitter problem earlier.

  Finally, the modification I made is really simple, I know it could be
  made in much better way but for my test purposes was enough, but it is
  not included in any way in the original version of gua, which works with
  normal scheduling priority, I would like to know if there is any reason
  unknown for me for not using this real-time scheduling technique. Apart
  from the necessity of running the application as root, Is it not a
  recommendable technique?

  Thanks in advance,

  Carlos.




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