Subject: Re: [linux-audio-user] Re: es1370 latency and jackd, late driver wakeup
From: Louis Lam (lshoujun_AT_yahoo.com)
Date: Thu Sep 23 2004 - 04:16:02 EEST
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.
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 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.
Thanks a lot,
Louis
> Jan
>
> On Wed, 2004-09-22 at 01:48, Louis Lam 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.
> > >
> > > 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?
> > >
> > > 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
> > >
> > >
> > >
> > > ________________________________________________________________________
> > > Yahoo! Messenger - Communicate instantly..."Ping"
> > > your friends today! Download Messenger Now
> > > http://uk.messenger.yahoo.com/download/index.html
> > >
> >
> >
> > ________________________________________________________________________
> > Yahoo! Messenger - Communicate instantly..."Ping"
> > your friends today! Download Messenger Now
> > http://uk.messenger.yahoo.com/download/index.html
>
>
________________________________________________________________________
Yahoo! Messenger - Communicate instantly..."Ping"
your friends today! Download Messenger Now
http://uk.messenger.yahoo.com/download/index.html
This archive was generated by hypermail 2b28 : Thu Sep 23 2004 - 04:20:52 EEST