Subject: RE: [linux-audio-user] Interuptions While Recording
From: linuxmedia4@netscape.net
Date: Thu Feb 13 2003 - 00:51:11 EET
Mark Knecht <mknecht@controlnet.com> Wrote:
> Rocco,
> Hi. Why all the focus on the disk drive side only? There's
> also a good chance that the sound card is not getting serviced
> and this causes the interruption.
> From my experience your drives have more than enough raw speed
> to record and playback a few channels of audio anyway, so I think
> that the disk drive is unlikely to be the issue here.
> Things to think about and look for:
> 1) Interrupts are not set up well
Early on I worked on the Sound Card end of this long investigation.
Someone on this list mentioned an article that you wrote about
IRQ priority ordering and Latency using lspci. Unfortunatly, I
(carelessly) did a Google search with the wrong key words. Your
responce (this email) prompted me to look back at the original
email. This time I used the correct keywords and it took me right
to the HOWTO. It looks pretty promising. I will work with that and
see if that has an effect on the situation.
I wish I had done this in the first place. I wasted so much time
trying to "push IRQ's around" by using the only BIOS setting
available ("reserve IRQ for legacy ISA"). Partly what made this
useless was that (prior to finding the HOWTO), I wasn't even sure
what was a "good" IRQ or a "bad" IRQ. Besides, that was such a
hap-hazard way to proceed.
> 2) Some other application is stealing cycles
I eliminate as much of this as possible by running ecasound
without X and as root. But there could be a background process
going on. I would assume (by the consistency and predictability
of these "interrupts" that it's a problem with data transfer).
> a) autorun trying to play CDs automatically
I guess I don't understand this. If you're simply referring to
the CD player being busy, I'm not running the CD Player while
recording.
> b) some other app started automatically
Certainly possible.
Thanks for taking the time to help. I will work with the
HOWTO that I found and see how that works out.
Thanks,
Rocco
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