[Asterisk-Users] Re: Audio problems on Zap & SIP, local network, not IRQ related?

[kjcsb]

I have made the following additional changes:
- enabling MMX extensions in the Asterisk Makefile and remade, installed
- disabled parallel, serial, and mouse ports in the BIOS
- reenabled ACPI as I was getting errors in the log file

The audio problems still exist. Any further advice on how to improve the 
audio quality would be greatly appreciated.

Regards

Cameron
----- Original Message ----- 
From: "kjcsb" <kjcsb at orcon.net.nz>
To: "Asterisk Users Mailing List - Non-Commercial Discussion" 
<asterisk-users at lists.digium.com>
Sent: Friday, June 02, 2006 9:31 PM
Subject: Audio problems on Zap & SIP, local network, not IRQ related?


>I am trying to get to the bottom of audio clicks, pops, dropouts with my 
>Asterisk server. These occur even when the system is under minimal load 
>(e.g. 1 Zap device in a queue being played music on hold) and occurs with 
>both Zap and Sip devices so isn't network related. The audio problems occur 
>at the same time on all channels and seems to be when Asterisk "gets busy" 
>and uses >50% CPU e.g. just after an announcement ("you are first in the 
>queue"). However running ztspeed (which takes CPU usage to 100%) seems to 
>have no impact on zttest numbers or the audio.
>
> I have the following setup:
> Fedora Core 4 2.6.16-1.2111 smp kernel
> TDM400 with 2 FXO and 2 FXS modules
> Various SIP devices
> SCSI hard drives
> 2 x P3 processors 500 MHz
> 1GB RAM
>
> Based on what I've read I would have thought that this setup could easily 
> handle one call being played music on hold in a queue.
>
> I have read 
> http://www.asteriskguru.com/tutorials/pci_irq_apic_tdm_ticks_te410p_te405p_noise.html 
> and various other postings to try and resolve this issue.
>
> When I run zttest I get 99.987793% most of the time but occasionally it 
> drops to 99.926758% which often corresponds with the audio degradation. I 
> have, however, noticed audio degradation at 99.987793% and good audio at 
> <99.87%.
>
> I have followed the instructions on disabling the Linux frame buffer 
> http://www.voip-info.org/wiki/index.php?page=Asterisk+disable+frame+buffer. 
> (There was no graphic on boot and no vga entry in /boot/grub/menu.lst
>
> I am not running X windows.
>
> The processors are not hyperthreading.
>
> I have disabled ACPI by adding acpi=off to /etc/grub.conf
>
> cat /proc/interrupts indicates no shared IRQs
>           CPU0       CPU1
>  0:   21418593   21478150    IO-APIC-edge  timer
>  1:        142         62    IO-APIC-edge  i8042
>  8:          1          0    IO-APIC-edge  rtc
>  9:          0          0   IO-APIC-level  acpi
> 16:      60618      60379   IO-APIC-level  megaraid
> 17:    4185189    4271566   IO-APIC-level  aic7xxx, aic7xxx
> 18:    1589117         12   IO-APIC-level  eth0
> 19:          0          0   IO-APIC-level  uhci_hcd:usb1
> 20:   85250811   86274087   IO-APIC-level  wctdm
> NMI:          0          0
> LOC:   42898234   42898233
> ERR:          0
> MIS:          0
>
> lspci -v
> 00:0a.0 Communication controller: Tiger Jet Network Inc. Tiger3XX 
> Modem/ISDN interface
>        Subsystem: Unknown device b100:0003
>        Flags: bus master, medium devsel, latency 32, IRQ 20
>        I/O ports at d800 [size=256]
>        Memory at fe100000 (32-bit, non-prefetchable) [size=4K]
>        Capabilities: [40] Power Management version 2
>
> lspci -vb
> 00:0a.0 Communication controller: Tiger Jet Network Inc. Tiger3XX 
> Modem/ISDN interface
>        Subsystem: Unknown device b100:0003
>        Flags: bus master, medium devsel, latency 32, IRQ 11
>        I/O ports at d800
>        Memory at fe100000 (32-bit, non-prefetchable)
>        Capabilities: [40] Power Management version 2
>
> No other device is using IRQ 20 (or 11)
>
> Running zttool shows no alarms, IRQ misses on the TDM400P
>
> cat /proc/cpuinfo
> processor       : 0
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 7
> model name      : Pentium III (Katmai)
> stepping        : 3
> cpu MHz         : 498.847
> cache size      : 512 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca 
> cmov pat pse36 mmx fxsr sse
> bogomips        : 999.41
>
> processor       : 1
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 7
> model name      : Pentium III (Katmai)
> stepping        : 3
> cpu MHz         : 498.847
> cache size      : 512 KB
> fdiv_bug        : no
> hlt_bug         : no
> f00f_bug        : no
> coma_bug        : no
> fpu             : yes
> fpu_exception   : yes
> cpuid level     : 2
> wp              : yes
> flags           : fpu vme de pse tsc msr pae mce cx8 apic mtrr pge mca 
> cmov pat pse36 mmx fxsr sse
> bogomips        : 997.59
>
> Does anyone have any further suggestions? I would really appreciate any 
> other pointers.
>
> Regards
>
> Cameron