<div dir="ltr">Thanks again Peter. <br>So my theory attributing timer issue to the terrible audio quality goes away. Need to find what else could be the cause !!<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Thu, Aug 29, 2013 at 2:36 PM, Peter Olsson <span dir="ltr">&lt;<a href="mailto:peter@olssononline.se" target="_blank">peter@olssononline.se</a>&gt;</span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">Yes, it might be a typo. IIRC it should be usec for time_test. The small sample of timer_test you provided seems ok to me, +/- 40 usec is probably good enough.<div><br></div><div>I think you&#39;re good to go :)</div>
<div><div class="h5">
<div><br></div><div>/Peter<div class="gmail_extra"><br><div class="gmail_quote">2013/8/29 Jayanth Acharya <span dir="ltr">&lt;<a href="mailto:jayachar88@gmail.com" target="_blank">jayachar88@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">

<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Thu, Aug 29, 2013 at 1:28 PM, Peter Olsson <span dir="ltr">&lt;<a href="mailto:peter@olssononline.se" target="_blank">peter@olssononline.se</a>&gt;</span> wrote:<br>


<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br><div dir="ltr">I believe that timerfd is used automatically in the core if it detects a system supporting it. However, I don&#39;t know how to really be sure.. :) One thing though, if you just startup FS, if it doesn&#39;t try to do clock calibration during startup, I think it is using timerfd stuff, so that might be a way to &quot;know&quot;...<div>



<br></div><div>Also, when running FS, you can try timer_test command (inside FS console) and check out the results in there.</div><span></span></div></blockquote><div><br></div><div>Thanks Peter.<br><br>freeswitch@dabbian1&gt; timer_test 10 3<br>


2013-08-29 13:56:24.703028 [CONSOLE] mod_commands.c:827 Timer Test: 1 sleep 10 10019<br>2013-08-29 13:56:24.712967 [CONSOLE] mod_commands.c:827 Timer Test: 2 sleep 10 9930<br>2013-08-29 13:56:24.722996 [CONSOLE] mod_commands.c:827 Timer Test: 3 sleep 10 10040<br>


<br>Avg: 9.996ms Total Time: 29.989ms<br><br></div><div>However,  for the &quot;time_test&quot; command in Mod_commands Wiki page -- I see that it assumes units as &quot;microseconds&quot; (not milliseconds, which is usually what we mean by &quot;ms&quot;).. or is it a typo ??<br>


<br><i>... bad timer jitter is.  It runs the test 
count times (default 10) and tries to sleep for<span style="background-color:rgb(255,255,0)"> mss microseconds</span>.  It 
returns the actual timer duration along with an average.
<br></i></div><div> <br></div><div>Anyhow, not sure how to interpret if the output of timer_test indicates a healthy resolution or not.<br><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">


<div dir="ltr"><span><font color="#888888"><div></div><div>/Peter</div></font></span></div><div><div><div class="gmail_extra"><br><br><div class="gmail_quote">
2013/8/29 Jayanth Acharya <span dir="ltr">&lt;<a href="mailto:jayachar88@gmail.com" target="_blank">jayachar88@gmail.com</a>&gt;</span><br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div dir="ltr"><div><div><div><div><div><div><div>Thanks Jeff. Reading the mod_timerfd wiki page, I see that there are 2 approaches to using timerfd, <br><br></div>1. Using the loadable module i.e. mod_timerfd (requiring me to build this module and then ensure it is loaded)<br>




</div>2. Using the support of timerfd now available in FS core itself (requiring me to just enable it in the switch.conf file)<br><br></div>By default neither of those 2 seem to be true. I am on what as the Git HEAD last week - 22nd Aug 2013, so pretty recent source. However, it when I adopted the 2nd approach, i.e. enable timerfd use in FS core, by enabling the config in switch.conf, it didn&#39;t have the desired effect. Perhaps indicating that my problems might not be limited to just the timer resolution !!<br>




<br></div>Using the method described here: <br><a href="http://www.advenage.com/topics/linux-timer-interrupt-frequency.php" target="_blank">http://www.advenage.com/topics/linux-timer-interrupt-frequency.php</a><br><br></div>



I tested and found that on my FS machine, the timer resolution available is already pretty good -- in the ~3KHz range, so shouldn&#39;t be an issue, if FS core is indeed correctly using timerfd.<br>
<br>---<br>kernel timer interrupt frequency is approx. 3401 Hz<br>jayachar@dabbian1:~$ ./timer_resolution_test<br>kernel timer interrupt frequency is approx. 3401 Hz<br>jayachar@dabbian1:~$ ./timer_resolution_test<br>kernel timer interrupt frequency is approx. 3448 Hz<br>




jayachar@dabbian1:~$ ./timer_resolution_test<br>kernel timer interrupt frequency is approx. 3021 Hz<br>jayachar@dabbian1:~$ ./timer_resolution_test<br>kernel timer interrupt frequency is approx. 3067 Hz<br>---<br><br></div>




I have already check that my kernel has the TIMERFD option enabled in the build, which explains (perhaps) the ~3KHz resolution I see.<br><br></div>So the question now is, is FS really using the timerfd logic in it&#39;s core properly, or do I need to try the mod_timerfd method as well !! (That&#39;s a rhetorical question... I will go ahead and try anyway, disabling the FS core option to use timerfd, as per the Wiki).<br>




<div><div><br></div></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Aug 29, 2013 at 11:21 AM, Jeff Leung <span dir="ltr">&lt;<a href="mailto:jleung@v10networks.ca" target="_blank">jleung@v10networks.ca</a>&gt;</span> wrote:<br>




<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div link="blue" vlink="purple" lang="EN-US"><div><p><span style="font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)">If I can recall correctly, timerfd will be used automatically regardless in recent versions of FreeSWITCH if it’s available.<u></u><u></u></span></p>




<p><span style="font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)"><u></u> <u></u></span></p><div style="border-width:medium medium medium 1.5pt;border-style:none none none solid;border-color:-moz-use-text-color -moz-use-text-color -moz-use-text-color blue;padding:0in 0in 0in 4pt">




<div><div style="border-width:1pt medium medium;border-style:solid none none;border-color:rgb(181,196,223) -moz-use-text-color -moz-use-text-color;padding:3pt 0in 0in"><p><b><span style="font-size:10pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style="font-size:10pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> <a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a> [mailto:<a href="mailto:freeswitch-users-bounces@lists.freeswitch.org" target="_blank">freeswitch-users-bounces@lists.freeswitch.org</a>] <b>On Behalf Of </b>Jayanth Acharya<br>




<b>Sent:</b> Wednesday, August 28, 2013 9:35 PM<br><b>To:</b> FreeSWITCH Users Help<br><b>Subject:</b> [Freeswitch-users] CONFIG_HZ=1000 vs mod_timerfd -- preferred approach<u></u><u></u></span></p></div></div><div><div>




<p><u></u> <u></u></p><div><div><div><p>Assuming that one has full control over the kernel configuration and FS build / config options, is there a preferred mechanism between the 2 for letting FS have access to high resolution timers, i.e.<u></u><u></u></p>




</div><ul type="disc"><li>CONFIG_HZ=1000<u></u><u></u></li><li>mod_timerfd<u></u><u></u></li></ul><p>This was one step I missed in my FS setup, and I think it might explain the extremely choppy, broken, garbled announcement I hear when I call into my gsmopen EP via phone.<u></u><u></u></p>




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