Re: rtirq failure

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On Sat, 8 Aug 2015, Ralf Mardorf wrote:

On Sat, 8 Aug 2015 20:46:17 +0100, Rui Nuno Capela wrote:

so you're left with the RTIRQ_NAME_LIST="snd_hdsp"... workaround for
sure.

Rui, thank you for the explanation.

It's not a workaround for me, I anyway would add snd_hdsp to ensure
that it gets a higher priority, than the Envy24 cards. I just worried
about it, because I didn't know, if it could become an issue for other
set-ups, used by others or maybe used by me in the future.

Without a script that works around this issue, for this card and perhaps
other cards, a default config to provide usable priorities for all
snd devices isn't ensured. That's a pity.

As someone who has tested more than one system, I do not think there is any such thing as a generic RTIRQ_NAME_LIST since early PCI days. Both FW and USB require hand editing the config file anyway for best use. The default generally works ok as it just prioritizes pciaudio, USB and FW "stuff". But it just works "ok". Getting good lowlatency out of it requires hand editting.

For example, almost all USB setups I have played with have at least one USB port that:
	- shares an irq with 3 or 4 other things
	- is a hub with internal USB bits (mics. wifi, camera, mouse, etc)
This means that the USB audio IF must be plugged into a "Clean" USB port and so things like RTIRQ_NAME_LIST="usb3 snd usb" will work where "usb snd" will not because usb2 may have mouse traffic on it that ends up prioritized ahead of usb3 with the audio.

The thing is that this is system stuff not user. Making a GUI to edit things inteligently and securely has not been done that I know of, but may be a good solution.

--
Len Ovens
www.ovenwerks.net

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