[linux-audio-user] Re: es1370 latency and jackd, late driver wakeup

[Jan Depner]

No new songs lately.  I just got my studio built though so something
should show up in the next couple of months.

On Wed, 2004-09-22 at 20:16, Louis Lam wrote:
> Hi Jan, how are u? any new songs recorded from your band?
> Hello to everyone.
> 
>  --- Jan Depner <eviltwin69 at cableone.net> wrote: 
> > Louis,
> > 
> > 	I've used this card before and it works well.  A couple of questions -
> > are you running 2.4 or 2.6 kernel?  Are you running as root?  One
> > important thing with the ens1370/71 - always use -r 48000!  The card
> > will produce tons of xruns at 44100 because it's native mode is 48K.
> 
> I'm running as root the whole time. 2.4.25-multimedia kernel from Agnula/DeMuDi.
> 
> I did try to run jackd at 48Khz rate initially, but at that point of time I didn't notice the
> xruns because I was only trying to test the card (maybe 2 weeks ago...). So I can't recall the
> behaviour of this card at 48khz...not much impression.
> 
> What I can remember from the time I ran jackd at 48Khz and ardour was this: Ardour thinks that the
> card is sampling at 47Khz! It shows up on the Ardour window. I find this odd because most of the
> time I see common sampling rate 44khz,48khz but not 47khz. I asked this question on one of the IRC
> channels and was told that no card really samples exactly at 48khz. For this "odd" sampling rate
> reason and also most of the drum samples I use are at 44khz. I just set myself to record
> everything at 44khz and didn't look at 48khz. So i kind of refrained from it for a while :)
> 
> But thanks for the tip... perhaps I should try that again.
> 
	It couldn't hurt.

> When i'm not having XRuns, I do have quite a number of "late driver wakeup" messages when running
> with this card though. They appear quite frequently. I don't quite understand what this means
> though. So far I can't find information/explanation for this. I was still able to record with
> Ardour a track at a time while playing back the recorded stuff at the same time for 2 minutes
> without pops, hisses and dropouts. I'm quite sure I can record more than 2 minutes under this
> situation(2 minutes because I start to run out of ideas... not because the system can't take it
> ;-P).
> 
	I have no idea what that is.

> I have also tried to record with ardour with plugins on (don't have a guitar amp so using the CAPS
> ladspa plugins), when I do that sometimes I get xruns and jack complains ardour is not "fast"
> enough or something like that. For dry signals normally its not much of an issue.
> 

Some of the TAP plugins (and others) are not real-time I think.

Jan