Yes, four calls with no issue. Actually I using Aslinux a little less
these days since my employer switched to a host IP-PBX. I just used the
latest Digium binaries in 0.44 (I think)
Also, my phones all handle G729 themselves so the need for transcoding
is minimal. I don't have the need to force the media through the server
all the time.
Michael
--Original Message Text---
From: Sebastian Auriol
Date: Wed, 26 Sep 2007 10:19:33 +0100
Well I did say that CPU was not the limiting factor because I tried it
on two CPUs: one much faster than the other but both with the same
limit of two calls. That's not to say I can't get more calls up - I
can get many more up, but once we get to the third one, there is a
degradation in speech quality for all currently connected (G729) calls.
Even with CPU at only 22% or so on the slower chip and about 3% IIRC
on the faster chip.
The CPUs I used are VIA Nehemiah 1 GHz (using
codec_g729-gcc4-uclibc-pentium3.so) and Pentium M 1.7 or 2 GHz GHz
(can't remember which but they are both very fast - using
codec_g729-gcc4-uclibc-pentium-m.so ). And as I said, I tried the same
VIA hardware with AsteriskNOW (using codec_g729-gcc4-pentium3.so) and
didn't have the same audio problem.
Are you sure there is no call quality degradation once you get to the
third call? Which G729 binary are you using? Which version of
AstLinux? I was using subversion between 0.4.4 and 0.4.5.
Kind regards,
Sebastian
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of
Michael Graves
Sent: 25 September 2007 20:31
To: AstLinux Users Mailing List
Subject: Re: [Astlinux-users] Max concurrent G729 calls with uClibc
What you failed to tell us in on what hardware? G729 is very CPU
intensive. I get two calls on a Soekris Net4801 without any trouble. I
get four on a HP T5700 with a 1 GHz Transmeta CPU. Never needed more
than 4 so I'm not certain what the upper limit of the T5700 might be.
Michael
--Original Message Text---
From: Sebastian Auriol
Date: Tue, 25 Sep 2007 13:53:32 +0100
Max concurrent G729 calls with uClibc
Hi list,
Has anyone been able to get more than two G729 calls with transcoding
of decent voice quality on AstLinux 0.4 or greater? I was doing some
research into how many calls our hardware was able to transcode from
G729 to A-law, and it seems the limit is two and is not hardware
dependent. Once there are three calls up, the audio on all three calls
breaks up. This testing was done over a LAN, so it shouldn't be a
bandwidth problem. CPU on the original hardware I tested was around
22%, so CPU is not the limiting factor, and I even tested on much
faster hardware (Pentium-M) and the audio still broke up after the
third call. This testing was performed using the open-source G729
uClibc binaries for AstLinux 0.4 as it is for research and I didn't
want to buy licences which would be of no use if it didn't work and of
little use after the research is finished.
I also tested the open-source glibc G729 binaries with AsteriskNOW on
the same original hardware and I did not have the same problem, so this
points at uClibc as the culprit.
I talked to the maintainer of these open-source G729 binaries, Arkadi
Shishlov, and he already suspected uClibc, which is why I tested with
AsteriskNOW.
Here is part of what he said:
> It is probably uClibc pthread implementation.
> 6-8 g.729 calls with transcoding in both directions should not be a problem
> for this CPU.
FYI, the original hardware is able to transcode 15 calls from GSM to
A-law fine on AstLinux IIRC.
I am interested to learn if anyone has been able to get more than two
G729 calls up, with either the open-source binary, or the Digium
binary.
Kind regards,
Sebastian
P.S. I wrote this e-mail a few months ago, but was going to do a bit
more testing before sending it, but given this apparent flaw with
uClibc, and various other reasons (including possibly more sensibility
to jitter than other distributions), I had to abandon AstLinux (for now
at least) and didn't even have time for more testing. Nevertheless, I
thought it might be interesting to have this discussion in case anyone
has anything to contribute. It would be useful if anyone was able to
confirm these problems, or claim to not have these problems, so I would
encourage interested parties to do their own tests. I would also be
interested, of course, in results from testing the Digium G729
binaries.
--
Michael Graves [EMAIL PROTECTED]
Sr. Product Specialist www.pixelpower.com
Pixel Power Inc. [EMAIL PROTECTED]
o713-861-4005
c713-201-1262
skype mjgraves
fwd 54245
--
Michael Graves [EMAIL PROTECTED]
Sr. Product Specialist www.pixelpower.com
Pixel Power Inc. [EMAIL PROTECTED]
o713-861-4005
c713-201-1262
skype mjgraves
fwd 54245
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