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[ecasound] Environmental tweaks

From: Klaus Schulz <klaus.schulz@we...> - 2007-04-17 16:31

Hi folks.

I am still trying to squezze more out of my ecasound setup.
Since I am still not into coding, I am trying to mess around with the Linux and the PC itself.

I'd like to share some tweaks, which gave me overall better sound results.

1. I changed the timer freqency from 1000Hz to 5000Hz and use now the ck2 rt-patch
    I just realized that using schedtool on top of ecasound sched-fifo still improves the situation.
2. I play everything from RAM (tmpfs) and stop (hdparm) the HD while playback is running (I store /var into RAM and on top
    I am switching off all relevant daemons - cron, ksyslog....))
3. I switch off my screen and graphic card with vbetool
4. I boot up in recovery mode and start ecasound (X-less) right from the console 

My PC stays now pretty cool. As a side effect  the fans are running very low. My PC is now pretty noiseless.

Is there anything else I should think of?

I have the feeling that ALSA and my snd-usb-audio driver might bear some tweak potential. 

However tweaks above brought me again a big step forward.


Cheers
\Klaus



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Re: [ecasound] Environmental tweaks

From: Dubphil <dubphil@fr...> - 2007-04-17 22:13

Klaus Schulz a écrit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear some tweak potential. 
>
> However tweaks above brought me again a big step forward.
>   
Something that should improve a lot :

add the option nrpacks=1 to the module snd-usb-audio and check this :
$ zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=y
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the frames as
you need.

if not, good kernel compilation !

Regards

Philippe



--===============1499231778==--
ReSent-Date: Wed, 18 Apr 2007 01:13:06 +0300 (EEST)
ReSent-From: Kai Vehmanen <kaiv@...>
ReSent-To: ecasound-list@...
ReSent-Subject: Re: [ecasound] Environmental tweaks
ReSent-Message-ID: <Pine.LNX.4.64.0704180113060.3053@...>

Klaus Schulz a écrit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear some tweak potential. 
>
> However tweaks above brought me again a big step forward.
>   
Something that should improve a lot :

add the option nrpacks=1 to the module snd-usb-audio and check this :
$ zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=y
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the frames as
you need.

if not, good kernel compilation !

Regards

Philippe



--===============1499231778==--

Re: [ecasound] Environmental tweaks

From: Klaus Schulz <klaus.schulz@we...> - 2007-04-18 22:11

Hi Philippe.

THX first of all, I'll try your tweaks today.

Is there anywhere a description of the snd-usb-driver options? Or do I
have to look in the code?

You mentioned "period size"  : It seems to me that ecasound calculates
the period size on its own, at least for Alsa,. Do you have an idea how
to get around it. Alsa is still giving me errors on not matching period
sizes, since I configured a buffer size of one sample with ecasound.

Cheers
Klaus


=20

-----Urspr=FCngliche Nachricht-----
Von: ecasound-list-bounces@...
[mailto:ecasound-list-bounces@...] Im Auftrag von
Dubphil
Gesendet: Dienstag, 17. April 2007 22:50
An: ecasound-list-bounces@...
Betreff: Re: [ecasound] Environmental tweaks


Klaus Schulz a =E9crit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear=20
> some tweak potential.
>
> However tweaks above brought me again a big step forward.
>  =20
Something that should improve a lot :

add the option nrpacks=3D1 to the module snd-usb-audio and check this : =
$
zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=3Dy
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the
frames as you need.

if not, good kernel compilation !

Regards

Philippe



--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D1499231778=3D=3D--
X-ReSent-Date: Wed, 18 Apr 2007 01:13:06 +0300 (EEST)
X-ReSent-From: Kai Vehmanen <kaiv@...>
X-ReSent-To: ecasound-list@...
X-ReSent-Subject: Re: [ecasound] Environmental tweaks
X-ReSent-Message-ID:
<Pine.LNX.4.64.0704180113060.3053@...>

Klaus Schulz a =E9crit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear=20
> some tweak potential.
>
> However tweaks above brought me again a big step forward.
>  =20
Something that should improve a lot :

add the option nrpacks=3D1 to the module snd-usb-audio and check this : =
$
zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=3Dy
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the
frames as you need.

if not, good kernel compilation !

Regards

Philippe



--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D1499231778=3D=3D--

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--===============1878164678==--
ReSent-Date: Thu, 19 Apr 2007 01:10:46 +0300 (EEST)
ReSent-From: Kai Vehmanen <kaiv@...>
ReSent-To: ecasound-list@...
ReSent-Subject: AW: [ecasound] Environmental tweaks
ReSent-Message-ID: <Pine.LNX.4.64.0704190110460.3053@...>

Hi Philippe.

THX first of all, I'll try your tweaks today.

Is there anywhere a description of the snd-usb-driver options? Or do I
have to look in the code?

You mentioned "period size"  : It seems to me that ecasound calculates
the period size on its own, at least for Alsa,. Do you have an idea how
to get around it. Alsa is still giving me errors on not matching period
sizes, since I configured a buffer size of one sample with ecasound.

Cheers
Klaus


=20

-----Urspr=FCngliche Nachricht-----
Von: ecasound-list-bounces@...
[mailto:ecasound-list-bounces@...] Im Auftrag von
Dubphil
Gesendet: Dienstag, 17. April 2007 22:50
An: ecasound-list-bounces@...
Betreff: Re: [ecasound] Environmental tweaks


Klaus Schulz a =E9crit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear=20
> some tweak potential.
>
> However tweaks above brought me again a big step forward.
>  =20
Something that should improve a lot :

add the option nrpacks=3D1 to the module snd-usb-audio and check this : =
$
zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=3Dy
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the
frames as you need.

if not, good kernel compilation !

Regards

Philippe



--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D1499231778=3D=3D--
ReSent-Date: Wed, 18 Apr 2007 01:13:06 +0300 (EEST)
ReSent-From: Kai Vehmanen <kaiv@...>
ReSent-To: ecasound-list@...
ReSent-Subject: Re: [ecasound] Environmental tweaks
ReSent-Message-ID:
<Pine.LNX.4.64.0704180113060.3053@...>

Klaus Schulz a =E9crit :
> I have the feeling that ALSA and my snd-usb-audio driver might bear=20
> some tweak potential.
>
> However tweaks above brought me again a big step forward.
>  =20
Something that should improve a lot :

add the option nrpacks=3D1 to the module snd-usb-audio and check this : =
$
zcat /proc/config.gz | grep -e CONFIG_EXPERIMENTAL -e USB_BANDWIDTH

if the output is this :

CONFIG_EXPERIMENTAL=3Dy
# CONFIG_USB_BANDWIDTH is not set

you are okay  :)  You can put a period of 3 to jackd and tweak the
frames as you need.

if not, good kernel compilation !

Regards

Philippe



--=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D1499231778=3D=3D--

------------------------------------------------------------------------
-
This SF.net email is sponsored by DB2 Express
Download DB2 Express C - the FREE version of DB2 express and take
control of your XML. No limits. Just data. Click to get it now.
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_______________________________________________
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Ecasound-list@...
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--===============1878164678==--