Re: [LAU] recommendations for usb sound card?

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To: James Stone <jamesmstone@...>
Cc: LAU <linux-audio-user@...>
Date: Monday, March 10, 2008 - 8:37 pm

On Mon, 2008-03-10 at 19:53 +0000, James Stone wrote:

this is not how video display works. they are a lot like audio
interfaces actually. periodically, they interrupt the host CPU to say
"i'm about to start redrawing the screen from the framebuffer you last
told me about". that's about it really. they never redraw the screen at
any other time.

when your GUI toolkit decides to redraw a widget, it doesn't interact
with the h/w. all that happens is that eventually the new image of the
screen gets into the framebuffer, and on the next "VSYNC" cycle, the
video card will push it out to the actual display.

what is an issue is that the drivers and/or h/w associated with the
video card sometimes do not play fair with the PCI bus - they claim
owernship over it for too long while doing a redraw, and this *does*
lead to xruns at low latencies.

--p

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Messages in current thread:
[LAU] recommendations for usb sound card?, James Stone, (Sat Mar 8, 7:58 am)
Re: [LAU] recommendations for usb sound card?, Alex Polite, (Mon Mar 10, 3:19 pm)
Re: [LAU] recommendations for usb sound card?, Clemens Ladisch, (Mon Mar 10, 3:54 pm)
Re: [LAU] recommendations for usb sound card?, Bill Allen, (Sat Mar 15, 5:18 pm)
Re: [LAU] recommendations for usb sound card?, Clemens Ladisch, (Mon Mar 17, 8:16 am)
Re: [LAU] recommendations for usb sound card?, Bill Allen, (Mon Mar 17, 10:50 pm)
Re: [LAU] recommendations for usb sound card?, Clemens Ladisch, (Tue Mar 18, 8:43 am)
Re: [LAU] recommendations for usb sound card?, Bill Allen, (Wed Mar 19, 1:38 am)
Re: [LAU] recommendations for usb sound card?, Clemens Ladisch, (Wed Mar 19, 8:01 am)
Re: [LAU] recommendations for usb sound card?, Bill Allen, (Wed Mar 19, 10:37 pm)
Re: [LAU] recommendations for usb sound card?, Clemens Ladisch, (Thu Mar 20, 8:09 am)
Re: [LAU] recommendations for usb sound card?, Bill Allen, (Sun Mar 16, 6:15 pm)
Re: [LAU] recommendations for usb sound card?, Sharp Hall, (Sat Mar 15, 5:28 pm)
Re: [LAU] recommendations for usb sound card?, Fons Adriaensen, (Sat Mar 15, 6:06 pm)
Re: [LAU] recommendations for usb sound card?, Lee Revell, (Sun Mar 9, 12:03 am)
Re: [LAU] recommendations for usb sound card?, James Stone, (Sun Mar 9, 8:15 am)
Re: [LAU] recommendations for usb sound card?, Lee Revell, (Mon Mar 10, 5:56 pm)
Re: [LAU] recommendations for usb sound card?, James Stone, (Mon Mar 10, 7:53 pm)
Re: [LAU] recommendations for usb sound card?, Paul Davis, (Mon Mar 10, 8:37 pm)
Re: [LAU] recommendations for usb sound card?, Lee Revell, (Tue Mar 11, 12:30 am)
Re: [LAU] recommendations for usb sound card?, James Stone, (Tue Mar 11, 10:37 pm)
Re: [LAU] recommendations for usb sound card?, Frank Barknecht, (Sat Mar 8, 10:32 am)
Re: [LAU] recommendations for usb sound card?, James Stone, (Sun Mar 9, 7:33 am)
Re: [LAU] recommendations for usb sound card?, Frank Barknecht, (Sun Mar 9, 10:12 am)
Re: [LAU] recommendations for usb sound card?, Hartmut Noack, (Sun Mar 9, 11:13 am)
Re: [LAU] recommendations for usb sound card?, Frank Barknecht, (Sun Mar 9, 2:27 pm)
Re: [LAU] recommendations for usb sound card?, Paul Winkler, (Sun Mar 9, 4:38 pm)
Re: [LAU] recommendations for usb sound card?, Arnold Krille, (Sun Mar 9, 5:48 pm)
Re: [LAU] recommendations for usb sound card?, Paul Winkler, (Sun Mar 9, 6:19 pm)
Re: [LAU] recommendations for usb sound card?, Pieter Palmers, (Mon Mar 10, 10:31 am)
Re: [LAU] recommendations for usb sound card?, Dominic , (Sun Mar 9, 12:21 pm)
Re: [LAU] recommendations for usb sound card?, Thomas Skellund, (Sat Mar 8, 8:45 am)