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

[R Parker]

Hi Louis,

--- Louis Lam <lshoujun at yahoo.com> wrote:

> Hi All,
> 
> No reply so far to this post, but its alright...
> maybe you guys are busy.
> 
> I was thinking of two possibilities of why this is
> happening:
> 1. The Soundcard itself: I'm not sure whether the
> card can take the polling period of 2 by design.
> Couldn't find any previous post on this.
> 
> 2. The Driver. But I've not seen any report on this
> in the linux-audio-users or alsa list. Can
> this have impact on the late driver wakeup issue?
> 
> Thank you guys, my experience in Linux Audio has
> been pleasant so far.
> 
> Many Thanks, 
> Louis 
> 
>  --- Louis Lam <lshoujun at yahoo.com> wrote: 
> > Hello All,
> > 
> > I have a bunch of old consumer sound cards.
> SBLive, Vibra128 and ensoniq 1370(es1370). I went
> > through quite a number of rounds trying out these
> cards and found that IMHO the es1370 gave me
> > the
> > best sound amongst these cards. So i went ahead
> and try to start jack according to the
> > capabilities of this card.
> > 
> > With this card, i find that once i start jackd
> like this:
> > 
> > jackd -v -R -d alsa es1370 -r 44100 
> > 
> > I get lots of xruns immediately.
> > 
> > Then i tried with the n=4 (ie 4 periods per
> hardware buffer), i.e "jackd -v -R -d alsa es1370 -n
> > 4" and I am able to get rid of the xruns. But i
> see lots of "late driver wakeup: nframes to
> > process=2048" on the jackd output. What does this
> message mean? 
> > 
> > For recording into ardour, n=4 and the default
> frames per period (1024) gives me quite
> > significant
> > latency when recording. e.g when I pluck a note on
> the electric bass i can hear it on the
> > line-in
> > monitor first and then from the capture slightly
> later.

If the card is capable and assuming you're not using
an external hardware mixer, you need Hardware monitor;
Options, Misc, Hardware monitor.

> > As a compromise, i set the frames per period to
> either 64, 128 or 256. But I still get  the
> > "late
> > driver wakeup" message and occasional xrun when i
> quit ardour or sometimes even hydrogen. I
> > notice
> > that when quitting jackd programs there will
> sometimes be a few xruns. Is this normal?

Normal, I don't know. Common, is another story. The
key is that you have monitoring options that eliminate
the need for low latency. Make sense?

ron

> > Seems like ideal to start n=2 but this card don't
> seem to allow me to do that. I could be wrong
> > but i think for low latency n=2 is ideal. 
> > 
> > If i have saved an ardour project with Tim
> Goetze's plugin activated in some tracks, ardour may
> > report that it is too slow or (something like
> that) when i reload that project file. I suspect
> > this is to do with some ladspa plugins requiring
> low latency which my setup is not able to give.
> > 
> > I know this card is old, but it does give a great
> sound. I used SBLive previously and don't seem
> > to have these latency issues (able to start jack
> with n=2). For owners of this card, any sound
> > advice to get the most out of it?
> > 
> > 
> > 
> > Thank You very much,
> > Louis
> > 
> > 
> > 
> >
>
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> 
> 
>
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