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
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