[linux-audio-user] RE: [Ardour-users] Re: [Alsa-devel] usb audio sound quality

[Patrick Shirkey]

Mark Knecht wrote:
 >
>    On the other hand, I wonder what part your USB sound card contributes to
> this problem simply because it's USB? USB transfers are pretty small. This
> causes the system to require more packets and packet headers to get the same
> amount of data moved. I wonder if the USB portion of Linux could be
> contributing to this problem? It may be that those of us using PCI based
> audio cards don't suffer this problem at all. I certainly haven't noticed
> any of the things your are talking about.
> 

Yes it's true that this could be directly related to the usb side of 
things. Only if I run alsaplayer in realtime with lotlat, rtc and root 
priv, through the alsa native interface this doesn't happen.

I know that JACK puts more stress on the systems interrupts so it could 
be that running such a demanding app with such high priorities supecedes 
the usb code slightly. I'm not sure if that is possible though. Anyone 
know how to check that?




-- 
Patrick Shirkey - Boost Hardware Ltd.
For the discerning hardware connoisseur
Http://www.boosthardware.com
Http://www.djcj.org - The Linux Audio Users guide
========================================

Being on stage with the band in front of crowds shouting, "Get off! No! 
We want normal music!", I think that was more like acting than anything 
I've ever done.

Goldie, 8 Nov, 2002
The Scotsman