Re: [Iaxclient-devel] linux, intel asound dmix plugin problem

[Andrea S. <si...@op...>]

Hi Alex,

I don't know if it's good or bad news, anyhow for report's sake
that's the story so far. The box, where we're we are experiencing the
same problem as yours, is an intel macbook(*). Switching desktop manager
from gmome to e17 makes a big difference in terms of audio quality.

At first we thought that our problem was solved, cause the audio quality
was a lot better, but unfortunately that was'nt completely true. We found
a negative correlation between CPU frequency and sound quality.

Setting CPU freq to 1GHZ and just using our voip soft phone
produce an audio stream with a decent quality... increasing
CPU freq higher than 1GHZ (e.g. due to "ondemand" scaling
governor) and switching between application makes (due to user normal workflow)
the sound quality more similar to the one described in Alex first post....

so it seems to me that some kind of scheduler strangeness is
hurting us... but I'm just guessing :)


(*)
portaudio ver: pa_stable_v19_20071207.tar.gz
iaxclient ver: upto date trunk
speex ver:     1.2beta3

00:00.0 Host bridge: Intel Corporation Mobile 945GM/PM/GMS, 943/940GML and 945GT Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML Express Integrated Graphics Controller (rev 03)
00:07.0 Performance counters: Intel Corporation Unknown device 27a3 (rev 03)
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 02)
00:1c.0 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 1 (rev 02)
00:1c.1 PCI bridge: Intel Corporation 82801G (ICH7 Family) PCI Express Port 2 (rev 02)
00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 02)
00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 02)
00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 02)
00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 02)
00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 02)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev e2)
00:1f.0 ISA bridge: Intel Corporation 82801GBM (ICH7-M) LPC Interface Bridge (rev 02)
00:1f.1 IDE interface: Intel Corporation 82801G (ICH7 Family) IDE Controller (rev 02)
00:1f.2 IDE interface: Intel Corporation 82801GBM/GHM (ICH7 Family) SATA IDE Controller (rev 02)
00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 02)
01:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8053 PCI-E Gigabit Ethernet Controller (rev 22)
02:00.0 Ethernet controller: Atheros Communications Inc. AR242x 802.11abg Wireless PCI Express Adapter (rev 01)
03:03.0 FireWire (IEEE 1394): Agere Systems FW323 (rev 61)



mirko@WhiteNoise:~$ cat /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU            1500  @ 2.00GHz
[cut]
clflush size    : 64

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 14
model name      : Genuine Intel(R) CPU            1500  @ 2.00GHz
[cut]
clflush size    : 64

mirko@WhiteNoise:~$ cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=8.04
DISTRIB_CODENAME=hardy
DISTRIB_DESCRIPTION="Ubuntu 8.04.1"

mirko@WhiteNoise:~$ uname -a
Linux WhiteNoise 2.6.24-19-generic #1 SMP Wed Jun 18 14:43:41 UTC 2008 i686 GNU/Linux



atuc wrote:
> hallo,

[cut]

> anybody else out here who has experences with alsa dmix/dsnoop plugin
> and iaxclient?