[Asterisk-Users] Strange Quality problems with Asterisk, Gentoo, Redhat and Kernels - /dev/dsp

[Duane Cox]

For what it's worth, I'm using linux-2.4.27 kernel built with gcc-3.3.4
and glibc-2.3.3  and everything is completely fine...  totaly custom distro.

Duane Cox

----- Original Message ----- 
From: "Deon Rodden" <drodden at webunited.net>
To: <asterisk-users at lists.digium.com>
Sent: Wednesday, September 29, 2004 9:56 AM
Subject: [Asterisk-Users] Strange Quality problems with Asterisk, Gentoo, 
Redhat and Kernels - /dev/dsp


> I've compiled Asterisk on Redhat 9 and Fedora Core 1 in the past, 
> generally without any problems. Especially w/ the stock kernel, which I 
> generally loathe. When I tried to upgrade my Redhat 9 Server to the 2.4.27 
> kernel, doing a manual/clean compile, I had massive quality issues. I was 
> forced to go back down to a stock 2.4.24 kernel. Never figured out why.
>
> Now, I've installed Gentoo and am using the 2.4.26 kernel, and things 
> initially appeared ok. I emerge'd Asterisk, the dependencies were 
> downloaded compiled, Asterisk 0.9.0 was compiled, I then used cvs to 
> update to the latest libpri/zaptel/asterisk. Everything seemed fine. 
> However, I'm noticing the occasional quality issue. First I just thought 
> the music on hold was a little choppy, but that always seems normal, I 
> blamed the zaprtc/rtcsetup thing I'm using to get zaptel timing.
>
> But then we noticed problems with Grandstream phones. The grandstream 
> would connect to the Gentoo Asterisk Server via SIP, then go out via IAX 
> across a T1 to the main asterisk server (Redhat 9), which then pushes the 
> call via SIP to a Cisco Router that's connected to several PRI's. My last 
> clue therem ay be a problem with Gentoo is the T1 card we put in another 
> server. We put a T100P in another Gentoo server, therefore didn't need 
> zaprtc/rtcsetup, and it uses pri-net to simulate a Voice T1 PRI for a PBX 
> system. Calls will come in via IAX2, from my main asterisk server, and it 
> will then (using Zap) go out the T100P into the PBX. There's an 
> intermittant quality issue there as well.
>
> The only clues in the log files was something about /dev/dsp missing. This 
> didn't seem a big deal, music on hold worked, etc. but I noticed that 
> /dev/dsp existed on my redhat machines, even though they're the same 
> servers, no sound cards or anything. The kernel on the Redhat machines was 
> compiled with several sound card modules, but nothing integrated. An 
> 'lsmod' reveals a module called soundcore loaded, but I can't find 
> soundcore on my Gentoo machines.
>
> Is there anything mandator in the compilation of the kernel that will 
> affect Asterisk's quality? The CPU load on the systems is nothing. 
> Everything "appears" normal. The only common factor is custom compiled 
> kernel. A custom compiled 2.4.27 on Redhat had problems, and a Custom 
> Compiled 2.4.26-gentoo on Gentoo has not-so-apparent problems too.  I've 
> always been on top of the latest CVS updates on Zaptel/Asterisk/libPRI
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