[Asterisk-Users] iaxtel and jitterbuffer

[Michael Graves]

On Sat, 28 Aug 2004 15:24:01 -0400, Michael George wrote:

>On Sat, Aug 28, 2004 at 03:00:26PM -0400, Michael George wrote:
>> On Sat, Aug 28, 2004 at 08:39:50AM -0600, Rich Adamson wrote:
>> >  
>> > I do a lot of work with companies throughout the US on network performance
>> > and we _frequently_ run into routers, switches, servers, etc, that are
>> > allowed to auto-negotiate their half vs full duplex nic interfaces. About
>> > 50% of the time, systems will get it wrong as there are no standards as
>> > to how the negotiation should be done.
>> > 
>> > A recent case this past week indicated that data flow between two servers
>> > on the same layer-2 network was around 400 kbps when it should have been
>> > able to sustain at least 80 meg.
>> > 
>> > You might double check each of your ethernet interfaces to ensure duplex
>> > settings are correct. If not at full duplex all the way through, you'll
>> > run into the strangeness you're seeing under varying traffic loads.
>
>I just saw a page on the wiki that mentions that running X11 or a VESA frame
>buffer can cause jittery sound.  I only have this problem with IAX2, but that
>might be cause when I use Zap <--> Zap or Zap <--> SIP there is no en/decoding
>involved.
>
>I am running * on my main home server, which does run X and other software.
>Perhaps that's the problem?  Maybe if I juiced it up with more RAM, might that
>help?  It's at .5GB now, but I can easily take it to 1GB.  Or, maybe a 900MHz
>Athlon still can't handle the coding with X11 running?

My understand, admittedly limited, is that the windowing system (X or
other) generates a lot of interupts. This can burden the system that is
also engaged in real-time tasks such as rpt for voip.

That said, my Asterisk server is is an AMD2500+ with 512 MB ram. I did
install the Gnome desktop with Fedora Core 1, but I don't do anything
else on the server. It runs headless. I just ssh in to tweak * as
needed.

Michael


Michael
--
Michael Graves                           mgraves at pixelpower.com
Sr. Product Specialist                          www.pixelpower.com
Pixel Power Inc.                                 mgraves at mstvp.com

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