Subject: Re: [linux-audio-user] RE: [Ardour-users] Re: [Alsa-devel] usb audio sound quality
From: Patrick Shirkey (pshirkey_AT_boosthardware.com)
Date: Sat Nov 09 2002 - 00:26:21 EET
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
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