Terratec Aureon 5.1 MKII slow

Terratec Aureon 5.1 MKII slow

[Manuel Jander]

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Hi,

I have been experimenting with 5.1 USB devices. I'm using them on a Linksys
NSLU2. Some interfaces are reasonable
fast, some are extremely slow due to software sample rate conversion.
Now I'm using a Aureon 5.1 MKII. AFAIK it does hardware samplerate
conversion, but its significantly slower than another "GIGAPort AG"
I have around here.

Can anyone (maybe the driver author) tell me why is this adapter so slow ?
Could it be possible to make it faster tweaking the driver perhaps ?
Why is the maximum buffer so small ? It is just so small, so I'm forced to
add some bigger buffering by my self, creating even more overhead :(
I would have expected that on a USB device the PCM buffer could be arbitrary
large, so why is it so small ?

Thanks you very much for any advice.

Best Regards
Manuel Jander

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Re: Terratec Aureon 5.1 MKII slow

[Clemens Ladisch]

Manuel Jander wrote:
> Why is the maximum buffer so small ?

It's just some random value that was deemed appropriate several years
ago when nobody knew about multichannel interfaces.

> I would have expected that on a USB device the PCM buffer could be
> arbitrary large, so why is it so small ?

Indeed.  Version 1.0.10rc1 has increased this to 256 KB, the current
CVS version has 1 MB.


HTH
Clemens



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Re: Terratec Aureon 5.1 MKII slow

[Takashi Iwai]

At Mon, 26 Sep 2005 17:11:24 +0200 (METDST),
Clemens Ladisch wrote:
> 
> Manuel Jander wrote:
> > Why is the maximum buffer so small ?
> 
> It's just some random value that was deemed appropriate several years
> ago when nobody knew about multichannel interfaces.

... and there was no USB 2 at that time :-)


Takashi


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